Power source management module, display module, power source chip and electronic device

Abstract

Provided in the present application are a power source management module, a display module, a power source chip and an electronic device. The power source management module comprises a power source chip, a first power conversion circuit and a second power conversion circuit, wherein the power source chip is configured to connect to a power source, and the power source chip comprises a controller; one end of the first power conversion circuit and one end of the second power conversion circuit are each connected to the controller, and the other end of the first power conversion circuit and the other end of the second power conversion circuit are each configured to connect to a load; the maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit; each power conversion circuit is used for converting a voltage output by the power source; and the controller is used for receiving a load requirement voltage of the load and acquiring a load current, and on the basis of the load requirement voltage and the load current, controlling the first power conversion circuit or the second power conversion circuit to operate, wherein the load current is a current output by the power source management module to the load. The present application takes into account both high power and efficiency.

Description

Power management module, display module, power chip and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202411083228.1, filed on August 7, 2024, with the State Intellectual Property Office of China, and entitled "Power management module, display module, power chip and electronic device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of display, and in particular to a power management module, a display module, a power chip and an electronic device. BACKGROUND

[0003] With the evolution of materials and technology, the weight and volume of display panels in various electronic devices are gradually reduced. The types of display panels include liquid crystal displays, field emission displays, plasma display panels, and organic light-emitting diode displays, etc. Organic light-emitting diode (OLED) displays have the characteristics of fast response speed, high color purity and brightness, high contrast, wide viewing angle, etc. Generally, OLED display screens include active matrix OLED (AMOLED) display screens. AMOLED drives light-emitting diodes through a driving circuit, can realize large size and high resolution, and has good development prospects.

[0004] AMOLED display screens include pixels arranged in a matrix state, and the organic electro-luminescence (OEL) (referred to as organic EL) in each pixel is driven to emit light under a certain voltage. The higher the brightness and the larger the size of the AMOLED, the higher the power of the corresponding organic light-emitting element and the more the number of the corresponding organic light-emitting element, and accordingly, the higher the power demand of the power supply (referred to as EL power supply) for providing the positive and negative voltages of the organic light-emitting element. In addition, in large-size, high-brightness AMOLED display screens, the EL power supply power occupies the largest proportion, and therefore the efficiency of the EL power supply determines the power efficiency of the entire AMOLED display screen.

[0005] Large-size AMOLED display screens can be applied in various electronic devices such as large-screen mobile phones, tablets, notebooks, desktop computers, etc. At present, some AMOLED display screens set two symmetrical power conversion circuits in the EL power supply to meet the power demand of the device and achieve current sharing. However, the EL power supply in these devices cannot balance high power and high efficiency. SUMMARY

[0006] The application provides a power management module, a display module, a power chip and an electronic device, which can balance high power and high efficiency.

[0007] In a first aspect, the application provides a power management module, which comprises a power chip, a first power conversion circuit and a second power conversion circuit, the power chip is used for connecting a power supply, the power chip comprises a controller; one end of the first power conversion circuit and one end of the second power conversion circuit are connected with the controller respectively, the other end of the first power conversion circuit and the other end of the second power conversion circuit are used for connecting a load respectively; the maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit; the first power conversion circuit and the second power conversion circuit are both used for converting the voltage output by the power supply; the controller is used for receiving a load demand voltage of the load and obtaining a load current, and controlling the first power conversion circuit or the second power conversion circuit to work according to the size of the load demand voltage and the load current, the load current being the current output by the power management module to the load. The power conversion circuit can comprise a direct current to direct current circuit. Exemplarily, the power conversion circuit can be a reverse Buck-Boost circuit, which is a kind of boost-buck conversion circuit for generating negative voltage and is used for converting the positive voltage provided by the power supply into negative voltage and outputting the negative voltage for the load to use.

[0008] In the application, the maximum output powers of the first power conversion circuit and the second power conversion circuit are different, so the power output capacities are different, the switching tube in the power conversion circuit with lower power output capacity (the first power conversion circuit) has better dynamic parameters and lower switching loss and driving loss, the first power conversion circuit is controlled to work in light load, and the power supply has higher efficiency; the switching tube in the power conversion circuit with higher power output capacity (the second power conversion circuit) has lower on-resistance, so the second power conversion circuit is controlled to work in heavy load, the on-resistance loss is low, and the power conversion circuit can support higher output power. By setting the power conversion circuits with different power output capacities and adjusting the appropriate power conversion circuit to work according to the actual load demand voltage and the load current, different load demands can be met, so that the voltage and power finally output by the power management module can meet the load demands, and the power supply has higher efficiency, balancing high efficiency and large output power.

[0009] In a feasible implementation manner, the controller is used for:

[0010] In the case that the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value, the first power conversion circuit is controlled to work;

[0011] In the case that the load demand voltage is greater than or equal to the voltage threshold value or the load current is greater than or equal to the first current threshold value, the second power conversion circuit is controlled to work.

[0012] In the present application, since the maximum output power of the first power conversion circuit and the second power conversion circuit is different, it is indicated that the power output capability of the two is different, and the maximum current or maximum voltage that the devices in the two can withstand when working is also different. When the load demand voltage and the load current are small, the first power conversion circuit works, and the circuit is in a light load state. Since the current carrying capacity of the devices in the first power conversion circuit is smaller and the voltage resistance is smaller, the power efficiency is higher in the light load state. When the load demand voltage or the load current is large, the second power conversion circuit works, and the circuit can be in a medium load or heavy load state. The current carrying capacity of the devices in the second power conversion circuit is larger and the voltage resistance is larger compared with the first power conversion circuit, and the power efficiency is higher in the medium load or heavy load state. At the same time, the first power conversion circuit is controlled to work when the voltage and current are low, and the first power conversion circuit is controlled not to work when the voltage or current is high, which can realize the protection of the devices in the first power conversion circuit.

[0013] In a feasible implementation manner, the first power conversion circuit and the second power conversion circuit each include a switching tube and an inductor. The inductor in the first power conversion circuit and the second power conversion circuit is located outside the power supply chip. The switching tube in the first power conversion circuit is integrated in the power supply chip. The switching tube in the second power conversion circuit is located outside the power supply chip.

[0014] In the present application, the switching tube in the first power conversion circuit is integrated in the power supply chip, and a switching tube with good dynamic parameters can be selected to reduce switching loss. The switching tube in the second power conversion circuit is arranged outside the power supply chip, and a switching tube with small on-resistance can be selected to reduce heat generation and improve output power. Correspondingly, the first power conversion circuit is controlled to work in a light load state to improve the power efficiency in the light load state. The second power conversion circuit is controlled to work in a heavy load state to improve the output power. Therefore, high efficiency and large output power can be considered, and various application scenarios can be adapted.

[0015] In a feasible implementation manner, the power management module further includes a third power conversion circuit. The maximum output power of the third power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit. The inductor and the switching tube in the third power conversion circuit are located outside the power supply chip. The controller is specifically used for:

[0016] In the case that the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value, the first power conversion circuit is controlled to work;

[0017] In the case that the load demand voltage is greater than or equal to the voltage threshold value and the load current is less than the second current threshold value, the second power conversion circuit is controlled to work;

[0018] in a case where the load demand voltage is less than the voltage threshold value and the load current is greater than or equal to the first current threshold value and less than a second current threshold value, controlling the second power conversion circuit to work;

[0019] in a case where the load current is greater than or equal to the second current threshold value, controlling the second power conversion circuit and the third power conversion circuit to work;

[0020] wherein the second current threshold value is greater than the first current threshold value.

[0021] In the present application, by setting a small power phase (referring to the first power conversion circuit) built-in a switch tube and two large power phases (including the second power conversion circuit and the third power conversion circuit) built-out of the switch tube, according to the size of the load demand voltage and the load current, the small power phase is controlled to work alone, one large power phase is controlled to work alone, and two large power phases are controlled to work in parallel, which can meet the load demand for light load, medium load and heavy load states respectively, improves the power efficiency in the light load state, and provides greater output power in the heavy load state, so as to meet the requirements of different scenes and realize the balance between high efficiency and high power.

[0022] In a feasible implementation manner, the power management module further includes a fourth power conversion circuit, the maximum output power of the fourth power conversion circuit is greater than or equal to the maximum output power of the first power conversion circuit and less than the maximum output power of the second power conversion circuit; the inductor in the fourth power conversion circuit is located outside the power supply chip, and the switch tube in the fourth power conversion circuit is integrated in the power supply chip; the controller is specifically used for:

[0023] in a case where the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value, controlling the first power conversion circuit to work;

[0024] in a case where the load demand voltage is less than the voltage threshold value and the load current is greater than or equal to the first current threshold value and less than the third current threshold value, controlling the first power conversion circuit to work and the fourth power conversion circuit to work;

[0025] in a case where the load current is greater than or equal to the third current threshold value, controlling the first power conversion circuit and the fourth power conversion circuit to stop working and controlling the second power conversion circuit to work;

[0026] in a case where the load demand voltage is greater than or equal to the voltage threshold value, controlling the second power conversion circuit to work;

[0027] wherein the third current threshold value is greater than the first current threshold value.

[0028] In the present application, by setting two small power phases (referring to the first power conversion circuit and the fourth power conversion circuit) with built-in switching tubes and one large power phase (including the second power conversion circuit) with external switching tubes, according to the load demand voltage and the size of the load current, one small power phase is controlled to work alone, two small power phases are controlled to work together, and the large power phase is controlled to work alone, which can meet the load demand in light load, medium load and heavy load states, improve the power efficiency in light load and medium load states, and provide large output power in heavy load state, so as to meet the requirements of different scenes and realize high efficiency and large power.

[0029] In a feasible implementation manner, the first power conversion circuit and the second power conversion circuit each include a switching tube and an inductor, and the switching tube and the inductor in the first power conversion circuit and the second power conversion circuit are located outside the power supply chip.

[0030] In the present application, since the switching tubes in the first power conversion circuit and the second power conversion circuit are located outside the power supply chip, the switching tubes in each power conversion circuit can be selected to have smaller on-resistance, and these power conversion circuits have better heat dissipation and stronger load capacity. Different power conversion circuits can be controlled to work when the load demand voltage and the load current are different, such as controlling the first power conversion circuit to work in light load and controlling the second power conversion circuit to work in heavy load, which can improve the power efficiency in light load and improve the output power in heavy load.

[0031] In a feasible implementation manner, the power management module further includes a fifth power conversion circuit, the maximum output power of the fifth power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; the switching tube and the inductor in the fifth power conversion circuit are located outside the power supply chip; and the controller is specifically used for:

[0032] In the case that the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, the first power conversion circuit is controlled to work;

[0033] In the case that the load demand voltage is greater than or equal to the voltage threshold and the load current is less than the fourth current threshold, the second power conversion circuit is controlled to work, and the fourth current threshold is greater than the first current threshold;

[0034] In the case that the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the fourth current threshold, the second power conversion circuit is controlled to work;

[0035] In the case that the load current is greater than or equal to the fourth current threshold, the second power conversion circuit and the fifth power conversion circuit are controlled to work.

[0036] In the present application, by controlling the small power phase to work alone, one large power phase to work alone, and two large power phases to work together according to the load demand voltage and the size of the load current, the load demand can be met for different load conditions, the power efficiency is improved in the light load state, and a large output power is provided in the heavy load state, thereby improving the overall current output capability and voltage output capability, so as to meet the requirements of different scenes and achieve high efficiency and high power.

[0037] In a feasible implementation manner, the first power conversion circuit and the second power conversion circuit each include a switch tube and an inductor, the inductor in the first power conversion circuit and the second power conversion circuit is located outside the power supply chip, and the switch tube in the first power conversion circuit and the second power conversion circuit is integrated in the power supply chip.

[0038] In the present application, since the switch tubes in the first power conversion circuit and the second power conversion circuit are integrated in the power supply chip, the appropriate power conversion circuit is controlled to work under different load conditions, so as to ensure that the working efficiency of each power conversion circuit is high. In addition, the working state of the first power conversion circuit and the second power conversion circuit is controlled according to the load demand voltage and the load current, the control is more precise, the parameters of the switch tubes in the first power conversion circuit and the second power conversion circuit can be designed more precisely, and the efficiency is higher.

[0039] In a feasible implementation manner, the power management module further includes a sixth power conversion circuit, the maximum output power of the sixth power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; the inductor in the sixth power conversion circuit is located outside the power supply chip, and the switch tube in the sixth power conversion circuit is also integrated in the power supply chip; and the controller is specifically used for:

[0040] In the case that the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, the first power conversion circuit is controlled to work;

[0041] In the case that the load demand voltage is greater than or equal to the voltage threshold and the load current is less than the fifth current threshold, the second power conversion circuit is controlled to work, and the fifth current threshold is greater than the first current threshold;

[0042] In a case where the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the fifth current threshold, the second power conversion circuit is controlled to work;

[0043] In a case where the load current is greater than or equal to the fifth current threshold, the second power conversion circuit and the sixth power conversion circuit are controlled to work.

[0044] In the present application, by controlling the small power phase to work alone, the one large power phase to work alone, and the two large power phases to work together respectively according to the load demand voltage and the load current, the load demand can be met for different load conditions, the control is more precise for each load state, and the efficiency can be improved. Meanwhile, the parameters of the switching tubes in each power conversion circuit can be designed more precisely, and the efficiency can be further improved. In a feasible implementation manner, the first current threshold is determined based on the maximum current-carrying capacity of the switching tube in the first power conversion circuit, and the voltage threshold is determined based on the maximum voltage-withstanding capacity of the switching tube in the first power conversion circuit.

[0045] In the present application, by setting appropriate first current threshold and voltage threshold, the first power conversion circuit can work without overcurrent and overvoltage, the protection of the device is realized, and the safety of the circuit is improved.

[0046] In a feasible implementation manner, the on-resistance of the switching tube in the first power conversion circuit is greater than a first threshold.

[0047] In the present application, the switching tube in the power conversion circuit integrated in the power supply chip does not work in heavy load, and does not need to meet a large current-carrying capacity, so a switching tube with greater on-resistance than a conventional switching tube can be selected, the dynamic parameters of the switching tube are more optimal, the switching loss and driving loss of the first power conversion circuit in a light load state can be greatly reduced, and the efficiency of the power supply in the light load state can be improved. Meanwhile, since the switching tube in the first power conversion circuit does not need to be additionally packaged, the area of the power management module can be reduced while the efficiency is improved.

[0048] In a feasible implementation manner, the on-resistance of the switching tube in the second power conversion circuit is less than a second threshold, and the second threshold is less than the first threshold.

[0049] In the present application, the switch tube arranged outside the power supply chip does not work in the light load state, and the switching loss problem of the switch tube does not need to be considered, so a switch tube with smaller on-resistance than the conventional switch tube can be selected. The dynamic parameter of the switch tube is larger, the on-resistance is better, the conduction loss is smaller when the second power conversion circuit works, the heat is reduced, and the current carrying capacity is improved. At the same time, since the switch tube in the second power conversion circuit is located outside the power supply chip, compared with the switch tube integrated in the power supply chip, it has a separate package and better heat dissipation capacity, and the output power capacity can be stronger.

[0050] In a possible implementation, the load includes a display device, and each of the power conversion circuits is configured to provide a negative voltage power supply for the display device.

[0051] In a second aspect, the present application also provides a display module, which includes the power management module and the display device in the first aspect and any possible implementation of the first aspect. The input end of the power management module is configured to be connected to a power supply, the output end of the power management module is configured to be connected to the display device, and the power management module is configured to convert and output the voltage provided by the power supply to the display device.

[0052] In a third aspect, the present application also provides a power supply chip, which includes a controller. The power supply chip is configured to be connected to a power supply, and the controller is configured to be connected to one end of a first power conversion circuit and one end of a second power conversion circuit. The maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit. The other end of the first power conversion circuit and the other end of the second power conversion circuit are configured to be connected to a load. The first power conversion circuit and the second power conversion circuit are both configured to convert the voltage output by the power supply. The controller is configured to:

[0053] receive a load demand voltage of the load and obtain a load current, and control the first power conversion circuit or the second power conversion circuit to work according to the load demand voltage and the load current. The load current is the current received by the load.

[0054] In a possible implementation, the controller is configured to:

[0055] In the case that the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value, the first power conversion circuit is controlled to work.

[0056] In the case that the load demand voltage is greater than or equal to the voltage threshold value, or the load current is greater than or equal to the first current threshold value, the second power conversion circuit is controlled to work.

[0057] In a possible implementation, the controller is further configured to connect one end of a fifth power conversion circuit, and the other end of the fifth power conversion circuit is configured to connect the load, and the maximum output power of the fifth power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; and the controller is configured to:

[0058] control the first power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is less than a first current threshold;

[0059] control the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold and the load current is less than a fourth current threshold, the fourth current threshold being greater than the first current threshold;

[0060] control the second power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the fourth current threshold;

[0061] control the second power conversion circuit and the fifth power conversion circuit to work when the load current is greater than or equal to the fourth current threshold.

[0062] In a fourth aspect, the present application provides an electronic device, which comprises the power management module in the first aspect and any possible implementation of the first aspect, the display module in the second aspect, or the power chip in the third aspect and any possible implementation of the third aspect. BRIEF DESCRIPTION OF DRAWINGS

[0063] FIG. 1 is a structural schematic diagram of a power management module provided by an embodiment of the present application;

[0064] FIG. 2 is a flow schematic diagram of a control method provided by an embodiment of the present application;

[0065] FIG. 3 is another flow schematic diagram of a control method provided by an embodiment of the present application;

[0066] FIG. 4 is another structural schematic diagram of a power management module provided by an embodiment of the present application;

[0067] FIG. 5 is yet another structural schematic diagram of a power management module provided by an embodiment of the present application;

[0068] FIG. 6 is yet another structural schematic diagram of a power management module provided by an embodiment of the present application;

[0069] FIG. 7 is yet another structural schematic diagram of a power management module provided by an embodiment of the present application;

[0070] Fig. 8 is another structural schematic diagram of the power management module according to an embodiment of the present application;

[0071] Fig. 9 is another structural schematic diagram of the power management module according to an embodiment of the present application;

[0072] Fig. 10 is another structural schematic diagram of the power management module according to an embodiment of the present application;

[0073] Fig. 11 is a structural schematic diagram of a power chip according to an embodiment of the present application;

[0074] Fig. 12 is a structural schematic diagram of a display module according to an embodiment of the present application;

[0075] Fig. 13 is a structural schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0076] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described below with reference to the drawings.

[0077] The terms "first" and "second" and the like in the specification of the present application, claims, and drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device, etc. including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device, etc.

[0078] It should be understood that in the present application, "at least one" refers to one or more, "multiple" refers to two or more, "at least two" refers to two or three and more, and "and / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases: only A, only B, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0079] The power management module, display module, power chip and electronic device provided in the application can be applied to the field of terminal communication and used in various displays. The electronic device provided in the application can include various devices with display screens, such as large-screen mobile phones, tablet computers, notebook computers, desktop computers and the like.

[0080] The power management module, display module, power chip and electronic device provided in the application will be described below in combination with FIGS. 1-11.

[0081] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a power management module provided in an embodiment of the application. As shown in FIG. 1, the power management module can include a power chip, a first power conversion circuit (such as power conversion circuit 1 in FIG. 1) and a second power conversion circuit (such as power conversion circuit 2 in FIG. 1). The power chip is used to connect a power supply, and the power chip includes a controller. One end of the first power conversion circuit and one end of the second power conversion circuit are connected with the controller respectively, and the other end of the first power conversion circuit and the other end of the second power conversion circuit are used to connect a load respectively. The maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit.

[0082] In other words, the power management module includes a power chip and multiple power conversion circuits. Each power conversion circuit is connected with the controller in the power chip. The output end of each power conversion circuit is used to connect a load; the maximum output power of at least two power conversion circuits in the multiple power conversion circuits is different; wherein the maximum output power of the first power conversion circuit in the multiple power conversion circuits is less than the maximum output power of the second power conversion circuit.

[0083] The first power conversion circuit and the second power conversion circuit are both used to convert the voltage output by the power supply to supply power to the load; these power conversion circuits can include a direct current (DC) to DC conversion circuit. Exemplarily, the power conversion circuit can be a reverse Buck-Boost circuit, that is, a kind of boost-buck conversion circuit for generating negative voltage, which is used to convert the positive voltage provided by the power supply into negative voltage and output for the load to use.

[0084] In a possible implementation, the load can include a display device, and each power conversion circuit is used to provide negative voltage power for the display device. The load is taken as an example of a display device in FIG. 1. The power chip, the first power conversion circuit and the second power conversion circuit can constitute the ELVSS power supply shown in FIG. 1. As shown in FIG. 1, the power management module can further include an ELVDD power supply, which can be used to provide positive voltage for the display device.

[0085] It can be understood that, in the power management module, the maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit, the maximum output powers of the power conversion circuits are different, which means that the power output capabilities of the power conversion circuits are different, and a part of the power conversion circuits can output smaller power, and another part can output larger power. By setting the power conversion circuits with different power output capabilities in the power management module, various application scenarios can be adapted, and appropriate power supply can be provided for loads with different requirements.

[0086] The controller in the power management module can be configured to receive a load demand voltage of the load and obtain a load current, and control the first power conversion circuit or the second power conversion circuit to work according to the load demand voltage and the load current, the load current being a current output by the power management module to the load.

[0087] The load demand voltage can be obtained by software, without the need for detection by a hardware circuit, and the control process is simple. In other words, the controller can receive a magnitude demand voltage of the load.

[0088] The load current can be a load current obtained by the ELVDD power supply in the power management module, so that the existing current detection circuit in the power management module can be reused, without the need for additional current detection circuits to be designed for different power conversion circuits in the ELVDD power supply, circuit design can be simplified, and the size can be reduced.

[0089] That is, the power management module provided by the present application can adjust the working of different power conversion circuits according to actual conditions, and when the load demand changes, the working power conversion circuits are adjusted accordingly, so that the voltage finally output by the power management module can meet the load demand; the working power conversion circuits are adjusted according to the load demand voltage and the load current, so that the devices in the power conversion circuits can work safely within their capability range, thereby maintaining a high power supply efficiency. That is, by selecting appropriate power conversion circuits to work according to the load demand voltage and the load current, both high working efficiency and power output requirements can be met.

[0090] In one possible implementation, the controller in the power management module can be configured to:

[0091] control the first power conversion circuit to work when the load demand voltage is less than a voltage threshold and the load current is less than a first current threshold;

[0092] control the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold, or the load current is greater than or equal to the first current threshold.

[0093] The first current threshold can be determined based on a maximum current carrying capability of a switch in the first power conversion circuit, and the voltage threshold can be determined based on a maximum voltage withstand capability of the switch in the first power conversion circuit.

[0094] Here, since the power conversion circuit mentioned in the present application is to convert the positive voltage provided by the power supply into a negative voltage, when the load demand voltage is greater than or equal to the voltage threshold, it can mean that the absolute value of the load demand voltage is greater than or equal to the voltage threshold. When the load demand voltage and the voltage threshold are compared in size in the following, it can be understood that the absolute value of the load demand voltage is compared with the voltage threshold.

[0095] Specifically, the first current threshold needs to be less than the maximum current carrying capability of the switch in the first power conversion circuit. In addition, the optimal efficiency point can be calculated by combining the dynamic parameters and on-resistance of the switch, etc. to determine the first current threshold. During the operation of the first power conversion circuit, its operating efficiency first increases and then decreases with the increase of the load current. Therefore, the load current value before the efficiency turning point can be selected as the first current threshold, so that the efficiency is higher. The first current threshold can be modified by software to adapt to different application scenarios and different electronic devices. The voltage threshold needs to be less than the maximum voltage withstand capability of the switch in the first power conversion circuit. The voltage threshold is designed and cannot be modified by software when the user uses the power supply control module, so as to ensure that the switch in the first power conversion circuit does not work when the load current is too large or the load demand voltage is too large, and the damage possibility is low. For example, the load demand negative voltage can be in the range of -16V-0V, the first current threshold can be in the range of 100-800mA, and the voltage threshold can be in the range of 4V-12V. When the absolute value of the load demand voltage is greater than or equal to the voltage threshold, it means that the load demand voltage is large. When the absolute value of the load demand voltage is less than the voltage threshold, it means that the load demand voltage is small.

[0096] In the embodiment of the present application, since the maximum output power of the first power conversion circuit and the second power conversion circuit is different, it means that the power output capabilities of the two are different, and then the maximum current or maximum voltage that the devices in the two can withstand when working is also different. That is, the maximum current (which can be called current carrying capability) and the maximum voltage (which can be called voltage withstand) that the devices in the two power conversion circuits can withstand are different.

[0097] For the first power conversion circuit, the maximum current and the maximum voltage that the devices in the circuit can withstand are small.

[0098] Therefore, the first power conversion circuit can be controlled to work when the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, so that the device in the first power conversion circuit is not easily damaged when the first power conversion circuit works. When the load demand voltage is high (greater than or equal to the voltage threshold) or the load current is large (greater than or equal to the first current threshold), the first power conversion circuit is controlled to stop working, and the second power conversion circuit is controlled to work, so that the possibility of damage to the device in the first power conversion circuit is reduced, the device is protected, and the working reliability is improved. On the other hand, when the load demand voltage and the load current are small, the first power conversion circuit works, and the circuit is in a light load state. Since the current-carrying capacity of the device in the first power conversion circuit is smaller and the voltage resistance is smaller, the power supply efficiency is higher in the light load state. When the load demand voltage or the load current is large, the second power conversion circuit works, and the circuit can be in a medium load or heavy load state. The current-carrying capacity of the device in the second power conversion circuit is larger than that in the first power conversion circuit, and the voltage resistance is larger. Therefore, the power supply efficiency is higher in the medium load or heavy load state.

[0099] In this way, by adjusting the working power conversion circuit according to the size of the load demand voltage and the load current, the load demand can be met, the power supply efficiency is improved, and the protection of the circuit device is realized.

[0100] In addition, since the first power conversion circuit and the second power conversion circuit do not work at the same time, there is basically no current unevenness problem.

[0101] It can be understood that, compared with the device for adjusting the working power conversion circuit according to the power size, the power management module in the present application controls the working state of the first power conversion circuit and the second power conversion circuit according to the load demand voltage and the load current. The control is more precise. In some cases of large current and small voltage or large voltage and small current, although the power is small, the large current exceeds the first current threshold or the large voltage exceeds the voltage threshold. The present application controls the first power conversion circuit to stop working and controls the second power conversion circuit to work, so that the protection of the first power conversion circuit is realized, the damage to the device in the first power conversion circuit is avoided, the control process is more detailed, and the reliability is higher.

[0102] Further, the first power conversion circuit control is more precise, and the parameters of the switch tube of the first power conversion circuit can be designed more precisely, and the efficiency is higher.

[0103] The process of the controller controlling different power conversion circuits to work in the process of changes of the load current and the load demand voltage will be described below with reference to a specific flowchart.

[0104] In the present application, the power conversion circuit with smaller maximum output power can be referred to as a small-power phase, and the power conversion circuit with larger maximum output power can be referred to as a large-power phase. For example, the first power conversion circuit and the second power conversion circuit can be referred to as a small-power phase and a large-power phase, respectively.

[0105] When the power management module just starts to work, the load current starts to increase from 0, and thus the first power conversion circuit starts to work first, so that a higher power supply efficiency can be ensured. When the power management module starts to work and receives the load demand voltage, it can be understood that the load demand voltage changes from 0 when not working to a value other than 0. Subsequently, the first power conversion circuit or the second power conversion circuit can be controlled to work according to the actual value of the load demand voltage and the value of the load current, so as to adapt to the actual demand of the load, output appropriate power, and try to ensure a higher efficiency. For details, refer to the steps shown in FIG. 2 and FIG. 3.

[0106] Please refer to FIG. 2. As shown in FIG. 2, FIG. 2 is a flowchart of a control method provided by an embodiment of the present application. As shown in FIG. 2, the method includes but is not limited to the following steps:

[0107] Step S201: receiving an instruction to boost the output voltage.

[0108] Step S202: determining whether the small-power phase is working.

[0109] Yes, then step S203 is performed, otherwise, step S205 is performed.

[0110] Step S203: determining whether the absolute value of the boosted output voltage is greater than or equal to a voltage threshold.

[0111] Yes, then step S204 is performed, otherwise, step S205 is performed.

[0112] Step S204: controlling the small-power phase to stop working and controlling the large-power phase to work.

[0113] Step S205: executing the instruction to boost the output voltage.

[0114] In this embodiment, when the absolute value of the load demand voltage becomes larger, the power supply control module receives the instruction to boost the output voltage, determines whether the small-power phase (for example, the first power conversion circuit) is working at this time, and if the small-power phase is not working, directly boosts the output voltage. If the small-power phase is working, further determination is made. If the absolute value of the boosted output voltage is smaller than the voltage threshold, the output voltage can be directly boosted. If the absolute value of the boosted output voltage is greater than or equal to the voltage threshold, the large-power phase (for example, the second power conversion circuit) can be controlled to work instead of the small-power phase, and then the output voltage is boosted. In this way, the small-power phase can be prevented from working when the output voltage is large, so that the switch tube in the small-power phase can be protected and burning can be avoided.

[0115] In an embodiment, the boosted output voltage can be a boost target value indicated in a received instruction of the boosted output voltage (referred to as boost instruction), and the boost target value in the instruction is compared with the voltage threshold value to determine whether the power phase needs to be adjusted, so that the appropriate power phase can be operated. That is, in actual application, the voltage can not be measured by hardware, but the boost target value is obtained by software (i.e., the boost instruction), so as to obtain the load demand voltage, and the control of the power phase is realized, which can simplify the measurement step, the control process is simple, and the control efficiency is high.

[0116] Please refer to FIG. 3, as shown in FIG. 3, FIG. 3 is a flowchart of another control method provided by the embodiment of the present application. As shown in FIG. 3, the method includes but is not limited to the following steps:

[0117] Step S301, receiving an instruction of reducing the output voltage.

[0118] Step S302, executing the instruction of reducing the output voltage.

[0119] Step S303, determining whether the small power phase is working.

[0120] Yes, executing step S307, otherwise, executing step S304.

[0121] Step S304, determining whether the absolute value of the reduced output voltage is greater than or equal to the voltage threshold value.

[0122] Yes, executing step S307, otherwise, executing step S305.

[0123] Step S305, determining whether the load current is greater than or equal to the first current threshold value.

[0124] Yes, executing step S307, otherwise, executing step S306.

[0125] Step S306, controlling the large power phase to stop working and controlling the small power phase to work.

[0126] Step S307, controlling the currently working power phase to continue working.

[0127] In this embodiment, when the absolute value of the load demand voltage decreases, the power supply control module receives a command to reduce the output voltage, reduces the output voltage, and determines whether the low-power phase (e.g., the first power conversion circuit) is working at this time. If the low-power phase is working, it can be controlled to continue working. If the low-power phase is not working and the high-power phase is working, it is further determined that if the absolute value of the reduced output voltage is greater than or equal to the voltage threshold, the high-power phase can be controlled to continue working. If the absolute value of the reduced output voltage is less than the voltage threshold, it is further determined that if the load current is greater than or equal to the first current threshold, the high-power phase can be controlled to continue working. If the load current is less than the first current threshold, the low-power phase can be controlled to work instead of the high-power phase. In this way, the high-power phase can be controlled to continue working according to the actual situation during the process of the absolute value of the load demand voltage decreasing, the switch tube of the low-power phase is protected, or the high-power phase is switched to the low-power phase to work, thereby improving the efficiency of the power supply.

[0128] In one embodiment, the reduced output voltage described above can be a voltage reduction target value indicated in the received command to reduce the output voltage (referred to as voltage reduction command). The voltage reduction target value in the command is compared with the voltage threshold to determine whether the power phase needs to be adjusted, and the appropriate power phase can be made to work. That is, in actual application, the voltage can not be measured by hardware, but the voltage reduction target value can be obtained by software (i.e., the voltage reduction command), thereby obtaining the load demand voltage and realizing the control of the power phase. The measurement step can be simplified, the control process is simple, and the control efficiency is high.

[0129] In one possible embodiment, the load current described above can be obtained through the ELVDD power supply in the power management module. Since the load current corresponding to the ELVDD power supply in the power management module is equal to the load current corresponding to the ELVSS power supply, the data of the load current obtained through the ELVDD power supply can be reused to obtain the load current required in this embodiment. In this way, the current detection circuit corresponding to the ELVDD power supply in the power management module can be reused, and it is not necessary to design an independent current detection circuit for each power phase in the ELVSS power supply, i.e., it is not necessary to additionally increase the current detection circuit, which can simplify the circuit design, realize simplicity, and be conducive to reducing the size of the power management module.

[0130] Please refer to Fig. 4, which is another structural diagram of the power management module provided by the embodiment of the present application. Fig. 4 is obtained on the basis of Fig. 1. As shown in Fig. 4, each power conversion circuit (such as the first power conversion circuit and the second power conversion circuit) in the power management module includes a switch tube and an inductor. Taking the power conversion circuit as an example of a reverse Buck-Boost circuit, the power conversion circuit can include two switch tubes and an inductor (or a group of inductors). The switch tube can be an insulated gate bipolar transistor (IGBT), or a metallic oxide semiconductor field effect transistor (MOSFET) (referred to as MOS tube), etc., which is not limited in the present application. Taking the switch tube as a MOS tube as an example, the two switch tubes in the power conversion circuit can be NMOS and NMOS. Alternatively, the two switch tubes can be NMOS and PMOS. The relative position relationship between the switch tube and the inductor in each power conversion circuit and the power chip is shown in Fig. 4. As shown in Fig. 4, the inductor in the first power conversion circuit (such as the power conversion circuit 1 in Fig. 4) and the second power conversion circuit (such as the power conversion circuit 2 in Fig. 4) is located outside the power chip, the switch tube in the first power conversion circuit is integrated in the power chip, and the switch tube in the second power conversion circuit is located outside the power chip.

[0131] Alternatively, the on-resistance of the switch tube in the first power conversion circuit can be greater than a first threshold value. The first threshold value can be determined based on the on-resistance of some conventional switch tubes. These conventional switch tubes are applied in a power management module including one or more power conversion circuits, and these conventional switch tubes are fully integrated in a power chip. These conventional switch tubes need to ensure a small on-resistance to meet certain current-carrying capacity requirements, so the dynamic parameters are large and the light load efficiency is low. Unlike this, the switch tube in the power conversion circuit integrated in the power chip in the embodiment of the present application does not work when the load current is large, so a switch tube with a large on-resistance can be selected. Compared with conventional switch tubes of the same process, the dynamic parameters of the switch tube, such as the charge Qg required for switch tube gate drive and the input capacitance Ciss, are more optimal, which can greatly reduce the switching loss and driving loss of the first power conversion circuit when it works in a light load state, and improve the power efficiency in a light load state.

[0132] Meanwhile, since the switch tube in the first power conversion circuit is integrated in the power supply chip, compared with arranging the switch tube outside the power supply chip, no additional packaging is needed, and various impedances and dynamic parameters are more optimal, which can improve the efficiency and reduce the area of the power management module. In other words, in the power management module provided by the application, the switch tube in the first power conversion circuit is arranged in the power supply chip, and the switch tube in the second power conversion circuit is arranged outside the power supply chip. Compared with the power management module in which the switch tubes in the power conversion circuits are all arranged outside the power supply chip, the packaging of the switch tube in the first power conversion circuit can be reduced, the dynamic parameters of the switch tube are more optimal, the requirement for inductance is reduced, the efficiency can be improved, and the area can be reduced.

[0133] In addition, the maximum withstand voltage capacity of the switch tube in the first power conversion circuit can be less than a preset withstand voltage value, which can be the maximum withstand voltage capacity of the conventional switch tube. That is, the switch tube in the power conversion circuit integrated in the power supply chip in the application can select a switch tube with smaller withstand voltage capacity, so that the switch tube has smaller switching loss and higher power supply efficiency when working, and the chip wafer area can be ensured to be smaller during manufacturing, thereby reducing the volume.

[0134] Optionally, the on-resistance of the switch tube in the second power conversion circuit is less than a second threshold value, and the second threshold value is less than the first threshold value. The second threshold value can be determined based on the on-resistance of another conventional switch tube. These conventional switch tubes are applied to a power management module including multiple power conversion circuits, and these conventional switch tubes are all located outside the power supply chip. These conventional switch tubes need to ensure appropriate dynamic parameters to meet higher switching frequency and efficiency performance, so the on-resistance is relatively large and the current flow capacity is relatively low. Unlike this, the switch tube arranged outside the power supply chip in the application embodiment does not work at light load, and does not need to consider the switching loss problem, so a switch tube with relatively small on-resistance can be selected. Compared with the conventional switch tube of the same process, the dynamic parameters of the switch tube are relatively large, the on-resistance is more optimal, the conduction loss is smaller when the second power conversion circuit works, the heat generation is reduced, and the current flow capacity is improved.

[0135] Meanwhile, since the switch tube in the second power conversion circuit is located outside the power supply chip, compared with the switch tube integrated in the power supply chip, the switch tube has a separate package and better heat dissipation capacity, and the output power capacity can be stronger. In other words, in the power management module provided by the application, the switch tube in the first power conversion circuit is arranged in the power supply chip, and the switch tube in the second power conversion circuit is arranged outside the power supply chip. Compared with the power management module in which the switch tubes in the power conversion circuits are all arranged in the power supply chip, since the switching loss problem of the switch tube in the second power conversion circuit does not need to be considered, the on-resistance is small, and the switch tube has a separate package, the heat dissipation capacity of the switch tube is better, the current-carrying capacity can be improved, and thus the upper limit of the output power is improved. In addition, the switch tube located outside the power supply chip is not limited by the power supply chip, and a suitable switch tube can be flexibly selected according to the application requirement, the comprehensive cost is low, the applicable range is wide, and the working effect is good.

[0136] In the embodiment of the application, by integrating the switch tube in the first power conversion circuit in the power supply chip and arranging the switch tube in the second power conversion circuit outside the power supply chip, the first power conversion circuit can be controlled to work in a light load state, and the power supply efficiency in the light load state is improved. The second power conversion circuit is controlled to work in a heavy load state, and the output power is improved. Thus, high efficiency and output power can be considered, and various application scenarios can be adapted.

[0137] Please refer to Fig. 5, which is another structural schematic diagram of the power management module provided by the embodiment of the application. Fig. 5 is obtained on the basis of Fig. 4. As shown in Fig. 5, the power management module can further include a third power conversion circuit (such as power conversion circuit 3 in Fig. 5), wherein the maximum output power of the third power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; the inductor and the switch tube in the third power conversion circuit are located outside the power supply chip; and the controller in the power management module can be specifically used for:

[0138] controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value;

[0139] controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold value and the load current is less than the second current threshold value;

[0140] controlling the second power conversion circuit to work when the load demand voltage is less than the voltage threshold value, and the load current is greater than or equal to the first current threshold value and less than the second current threshold value;

[0141] controlling the second power conversion circuit and the third power conversion circuit to work when the load current is greater than or equal to the second current threshold value;

[0142] wherein the second current threshold value is greater than the first current threshold value.

[0143] For example, the first current threshold value can be in the range of 100 mA to 800 mA, and the second current threshold value can be in the range of 500 mA to 2500 mA.

[0144] In the embodiments of the present application, the power output capability of the third power conversion circuit and the second power conversion circuit is stronger than that of the first power conversion circuit, and the power output capability of the third power conversion circuit is similar to or stronger than that of the second power conversion circuit. In this way, the current-carrying capability and voltage withstand of the switching tubes, inductors and other devices in the third power conversion circuit are also higher. When the load current is large, for example, greater than or equal to the first current threshold value and less than the second current threshold value, the second power conversion circuit can be controlled to work at this time, and the circuit can be in a medium load state, and one power conversion circuit working can meet the load demand. When the load current is larger, for example, greater than or equal to the second current threshold value, the controller can control the second power conversion circuit and the third power conversion circuit to work together at this time, and the circuit can be in a heavy load state, and two power conversion circuits in parallel output can provide greater voltage and power to meet the load demand.

[0145] It can be understood that when the load demand voltage is small (less than the voltage threshold value) and the load current is small (less than the first current threshold value), the controller can control the first power conversion circuit to work at this time, and the circuit can be in a light load state, and one power conversion circuit working can meet the load demand. Since the switching tube in the first power conversion circuit is integrated in the power supply chip, the power supply efficiency can be improved.

[0146] The present application sets up a small power phase (referring to the first power conversion circuit) with a built-in switching tube and at least two large power phases (including the second power conversion circuit and the third power conversion circuit) with external switching tubes. According to the size of the load demand voltage and the load current, the small power phase is controlled to work alone, one large power phase is controlled to work alone, and two large power phases are controlled to work in parallel, which can meet the load demand in light load, medium load and heavy load states respectively, improve the power supply efficiency in light load state, and provide greater output power in heavy load state, so as to meet the demand of different scenes and realize the balance between high efficiency and high power.

[0147] In addition, the switching tubes of the third power conversion circuit and the second power conversion circuit are located outside the power supply chip, and switching tubes with small on-state impedance can be selected to reduce on-state loss and heat generation, and the output power and output voltage depth of the power management module can be improved.

[0148] In addition, since the large power phase and the small power phase do not work at the same time, there is basically no current imbalance problem.

[0149] Please refer to Fig. 6, which is another structure diagram of the power management module provided by the embodiment of the present application. Fig. 6 is obtained on the basis of Fig. 4. As shown in Fig. 6, the power management module further comprises a fourth power conversion circuit (e.g., power conversion circuit 4 in Fig. 6), the maximum output power of the fourth power conversion circuit is greater than or equal to the maximum output power of the first power conversion circuit and less than the maximum output power of the second power conversion circuit; the inductor in the fourth power conversion circuit is located outside the power supply chip, and the switch tube in the fourth power conversion circuit is integrated in the power supply chip; the controller can be specifically used for:

[0150] controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold;

[0151] controlling the first power conversion circuit and the fourth power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the third current threshold;

[0152] controlling the first power conversion circuit and the fourth power conversion circuit to stop working and controlling the second power conversion circuit to work when the load current is greater than or equal to the third current threshold;

[0153] controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold;

[0154] wherein the third current threshold is greater than the first current threshold.

[0155] For example, the first current threshold can be in the range of 100 mA to 800 mA, and the third current threshold can be in the range of 500 mA to 2500 mA.

[0156] In the embodiment of the present application, the power output capability of the fourth power conversion circuit and the first power conversion circuit is weaker than that of the second power conversion circuit, and the power output capability of the fourth power conversion circuit is almost or slightly stronger than that of the first power conversion circuit. Therefore, the current carrying capacity and voltage resistance of the switch tube and the inductor in the fourth power conversion circuit are relatively small. When the load demand voltage is low and the load current is small (less than the first current threshold), the controller can control the first power conversion circuit to work, at this time, the circuit can be in a light load state, and one power conversion circuit can meet the load demand and has high efficiency. When the load demand voltage is low and the load current is medium (greater than or equal to the first current threshold and less than the third current threshold), the controller can control the first power conversion circuit and the fourth power conversion circuit to work together, at this time, the circuit can be in a medium load state, and two power conversion circuits are connected in parallel to output power for the load, which meets the load demand and has high efficiency.

[0157] It can be understood that when the load demand voltage is large (greater than or equal to the voltage threshold) or the load current is large (greater than or equal to the third current threshold), the controller can control the second power conversion circuit to work, at this time the circuit can be in a heavy load state, and the load demand can be met by using the second power conversion circuit to work. Since the switch tube in the second power conversion circuit is located outside the power supply chip, heat can be reduced, and larger output power can be provided.

[0158] The present application sets two small power phases (referring to the first power conversion circuit and the fourth power conversion circuit) with built-in switch tubes and a large power phase (including the second power conversion circuit and the third power conversion circuit) with an external switch tube. According to the size of the load demand voltage and the load current, one small power phase is controlled to work alone, two small power phases are controlled to work together, and the large power phase is controlled to work alone. The load demand can be met in light load, medium load and heavy load states. The power efficiency is improved in light load and medium load states, and larger output power is provided in heavy load state, so that different scene demands can be met, and high efficiency and large power are realized. The power management module shown in FIG. 6 has slightly smaller load capacity in heavy load state compared with the power management module shown in FIG. 5, and is suitable for display devices with moderate power.

[0159] In addition, since the large power phase and the small power phase do not work at the same time, there is basically no current unevenness problem.

[0160] Please refer to FIG. 7, which is another structural schematic diagram of the power management module provided by the embodiment of the present application. FIG. 7 is obtained on the basis of FIG. 1. As shown in FIG. 7, the first power conversion circuit (such as the power conversion circuit 1 in FIG. 7) and the second power conversion circuit (such as the power conversion circuit 2 in FIG. 7) each include a switch tube and an inductor. The switch tube and the inductor in each power conversion circuit are located outside the power supply chip.

[0161] In the embodiment of the present application, the power output capabilities of the first power conversion circuit and the second power conversion circuit included in the power management module are different, and the switch tubes in each power conversion circuit are located outside the power supply chip. Therefore, the switch tubes in each power conversion circuit can be selected to have smaller on-resistance. These power conversion circuits have better heat dissipation and stronger load capacity when working. Different power conversion circuits can be controlled to work when the load demand voltage and the load current are different, such as controlling the first power conversion circuit to work in light load and controlling the second power conversion circuit to work in heavy load. The power efficiency can be improved by using the first power conversion circuit to work in light load, and the output power can be improved by using the second power conversion circuit to work in heavy load.

[0162] Please refer to Fig. 8 as well, which is another structural schematic diagram of the power management module provided by the present application. Fig. 8 is obtained on the basis of Fig. 7. As shown in Fig. 8, the power management module can further include a fifth power conversion circuit (e.g., power conversion circuit 5 in Fig. 8), the maximum output power of which is greater than or equal to the maximum output power of the second power conversion circuit; the switch tube and the inductor in the fifth power conversion circuit are located outside the power supply chip; the controller can be specifically used for:

[0163] controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value;

[0164] controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold value and the load current is less than the fourth current threshold value, the fourth current threshold value being greater than the first current threshold value;

[0165] controlling the second power conversion circuit to work when the load demand voltage is less than the voltage threshold value and the load current is greater than or equal to the first current threshold value and less than the fourth current threshold value;

[0166] controlling the second power conversion circuit and the fifth power conversion circuit to work when the load current is greater than or equal to the fourth current threshold value.

[0167] For example, the first current threshold value can be in the range of 100 mA to 800 mA, and the fourth current threshold value can be in the range of 500 mA to 2500 mA. In the embodiment of the present application, the power management module can include a small-power phase (e.g., the first power conversion circuit) with switch tubes outside and at least two large-power phases (e.g., the second power conversion circuit and the fifth power conversion circuit) with switch tubes outside. According to the size of the load demand voltage and the load current, the small-power phase is controlled to work alone, one large-power phase is controlled to work alone, and two large-power phases are controlled to work together, which can meet the load demand for different load conditions, improve the power efficiency in the light load state, provide a large output power in the heavy load state, and improve the overall current output capability and voltage output capability, so as to meet the requirements of different scenes and realize the balance between high efficiency and high power. The power management module shown in Fig. 8 has stronger load carrying capacity in the heavy load state, and can be applied to display devices with larger power requirements. In other words, compared with Fig. 7, the power management module provided by Fig. 8 has a higher upper limit of output power, and can meet the power requirements of larger loads.

[0168] Please refer to Fig. 9, which is another structural schematic diagram of the power management module provided in the embodiments of the present application. Fig. 9 is obtained on the basis of Fig. 1. As shown in Fig. 9, the first power conversion circuit (such as the power conversion circuit 1 in Fig. 9) and the second power conversion circuit (such as the power conversion circuit 2 in Fig. 9) each include a switch tube and an inductor, the inductor in each power conversion circuit is located outside the power supply chip, and the switch tube in each power conversion circuit is integrated in the power supply chip.

[0169] In the embodiments of the present application, the power output capabilities of the first power conversion circuit and the second power conversion circuit included in the power management module are different, and the switch tubes in each power conversion circuit are integrated in the power supply chip. Therefore, the switch tubes in each power conversion circuit can be selected to have appropriate on-resistance and dynamic parameters. Since the load demand voltage and the load current correspond to different load conditions, the appropriate power conversion circuit is controlled to work under different load conditions, so that the working efficiency of each power conversion circuit can be ensured to be high. In addition, the working states of the first power conversion circuit and the second power conversion circuit are controlled according to the load demand voltage and the load current, so that the control is more precise. In some cases of large current and small voltage or large voltage and small current, although the power is small, the large current exceeds the first current threshold or the large voltage exceeds the voltage threshold. The present application controls the first power conversion circuit to stop working and controls the second power conversion circuit to work, so that the protection of the first power conversion circuit can be realized, the damage of the devices in the first power conversion circuit is avoided, the control process is more detailed, and the reliability is higher. Further, the first power conversion circuit is controlled to be more precise, the parameters of the switch tubes of the first power conversion circuit and the second power conversion circuit can be designed to be more precise, and the efficiency is higher.

[0170] Please refer to Fig. 10, which is another structural schematic diagram of the power management module provided in the present application. Fig. 10 is obtained on the basis of Fig. 9. As shown in Fig. 10, the power management module can further include a sixth power conversion circuit (such as the power conversion circuit 6 in Fig. 10), the maximum output power of the sixth power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; the inductor in the sixth power conversion circuit is located outside the power supply chip, and the switch tube in the sixth power conversion circuit is also integrated in the power supply chip; the controller can be specifically used for:

[0171] controlling the first power conversion circuit to work in the case that the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold;

[0172] controlling the second power conversion circuit to work in the case that the load demand voltage is greater than or equal to the voltage threshold and the load current is less than the fifth current threshold, the fifth current threshold being greater than the first current threshold;

[0173] In a case that the load demand voltage is less than the voltage threshold, and the load current is greater than or equal to the first current threshold and less than the fifth current threshold, the second power conversion circuit is controlled to work;

[0174] In a case that the load current is greater than or equal to the fifth current threshold, the second power conversion circuit and the sixth power conversion circuit are controlled to work.

[0175] For example, the first current threshold can be in a range of 100 mA to 800 mA, and the fifth current threshold can be in a range of 500 mA to 2500 mA.

[0176] In the embodiments of the present application, the power management module can include a small power phase (such as the first power conversion circuit) and a large power phase (such as the second power conversion circuit and the sixth power conversion circuit) with built-in switch tubes. According to the size of the load demand voltage and the load current, the small power phase is controlled to work alone, one large power phase is controlled to work alone, and two large power phases are controlled to work together, which can meet the load demand for different load conditions, adapt to different load states, control more finely for each load state, and improve the efficiency. The control process of the power management module shown in FIG. 10 is more fine, which can ensure a certain power output capability while having higher power efficiency. In other words, compared with FIG. 9, the power management module of FIG. 10 has higher efficiency, higher upper limit of output power, and can meet the power requirement of a larger load.

[0177] In a possible implementation, in the power management module as shown in any one of FIGS. 1, 4-10, the controller can pre-set two sets of loop compensation parameters for each power conversion circuit according to the different inductance values of the inductors in each power conversion circuit. The two sets of loop compensation parameters (for example, loop compensation parameter A1 and loop compensation parameter A2) can be adapted to inductors with smaller inductance values and inductors with larger inductance values, respectively. When the inductor selected in a certain power conversion circuit in the power management module is an inductor with a smaller inductance value, the controller can control the on-off of the switch tube in the power conversion circuit according to the loop compensation parameter A1 corresponding to the power conversion circuit. When the inductor selected in a certain power conversion circuit in the power management module is an inductor with a larger inductance value, the controller can control the on-off of the switch tube in the power conversion circuit according to the loop compensation parameter A2 corresponding to the power conversion circuit. In this way, the power control module can be applicable to scenarios with different inductance values, realize the balance between large output power and high power efficiency, and be applicable to flexible scenarios.

[0178] The application further provides a power supply chip, and FIG. 11 is a structural schematic diagram of the power supply chip provided in an embodiment of the application. As shown in FIG. 11, the power supply chip can include a controller, the power supply chip is used for connecting a power supply, the controller is used for connecting one end of a first power conversion circuit and one end of a second power conversion circuit, the maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit; the other end of the first power conversion circuit and the other end of the second power conversion circuit are used for connecting a load, and the first power conversion circuit and the second power conversion circuit are both used for converting the voltage output by the power supply; and the controller is used for:

[0179] receiving a load demand voltage of the load and obtaining a load current, and controlling the first power conversion circuit or the second power conversion circuit to work according to the sizes of the load demand voltage and the load current, the load current being the current received by the load.

[0180] In the embodiment of the application, the power supply chip controls the respective power conversion circuits, adjusts the appropriate power conversion circuit (the first power conversion circuit or the second power conversion circuit) to work according to the load demand voltage and the load current, and can meet the load demand for different load conditions, and is suitable for various application scenarios.

[0181] In a possible implementation, the controller in the power supply chip can be used for:

[0182] controlling the first power conversion circuit to work in the case that the load demand voltage is less than a voltage threshold value and the load current is less than a first current threshold value.

[0183] controlling the second power conversion circuit to work in the case that the load demand voltage is greater than or equal to the voltage threshold value or the load current is greater than or equal to the first current threshold value.

[0184] In the embodiment of the application, the controller controls the first power conversion circuit to work when the load demand voltage and the load current are small, and the first power conversion circuit can select a switch tube with better dynamic parameters, so that the power supply efficiency can be improved in a light load state. The controller controls the first power conversion circuit to work when the load demand voltage or the load current is large, and the first power conversion circuit can select a switch tube with smaller on-resistance, so that the on-resistance loss is reduced, the output power can be improved in a heavy load state, and the overall current output capability and voltage output capability are improved. In this way, the power supply can meet the requirements of different scenarios and realize the combination of high power supply efficiency and large output power.

[0185] In a possible implementation, the controller is further used for connecting one end of a fifth power conversion circuit, the other end of the fifth power conversion circuit is used for connecting the load, and the maximum output power of the fifth power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit; and the controller can be specifically used for:

[0186] control the first power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold;

[0187] control the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold and the load current is less than the fourth current threshold, the fourth current threshold being greater than the first current threshold;

[0188] control the second power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is greater than the first current threshold and less than the fourth current threshold;

[0189] control the second power conversion circuit and the fifth power conversion circuit to work when the load current is greater than or equal to the fourth current threshold.

[0190] In the embodiments of the present application, the controller can meet the load demand by controlling the small power phase to work alone, one large power phase to work alone, and two large power phases to work together according to the load demand voltage and the load current, which can meet the load demand for different load conditions, improve the power efficiency in the light load state, provide a large output power in the heavy load state, and improve the overall current output capability and voltage output capability, so as to meet the requirements of different scenes and achieve the balance between high efficiency and high power.

[0191] In addition, compared with adjusting the working state of the corresponding power conversion circuit according to the power size, the power supply chip in the present application controls the working state of the first power conversion circuit and the second power conversion circuit according to the load demand voltage and the load current, which is more precise. In some cases of large current and small voltage or large voltage and small current, although the power is large, the large current exceeds the first current threshold or the large voltage exceeds the voltage threshold. The present application controls the first power conversion circuit to stop working and controls the second power conversion circuit to work, which can realize the protection of the first power conversion circuit and avoid the damage of the devices in the first power conversion circuit. The control process is more detailed and the reliability is higher.

[0192] The present application also provides a display module. FIG. 12 is a structural schematic diagram of a display module provided by an embodiment of the present application. As shown in FIG. 12, the display module can include the power management module and the display device shown in any one of FIGS. 1, 4-10. In the display module, the input end of the power management module is used to connect the power supply, the output end of the power management module is used to connect the display device, and the power management module is used to convert and output the voltage provided by the power supply to the display device. Since the power management module in the display module can improve the power efficiency in the light load state and improve the output power in the heavy load state, the display module can achieve the balance between high power and high efficiency.

[0193] The application further provides an electronic device. FIG. 13 is a structural schematic diagram of an electronic device provided by an embodiment of the application. As shown in FIG. 13, the electronic device comprises the power management module shown in any one of FIGS. 1, 4-10, the power supply chip shown in FIG. 11, or the display module shown in FIG. 12. In the electronic device, the power supply chip or the power management module can improve the power supply efficiency in a light load state and improve the output power in a heavy load state, so that the electronic device can achieve both high power and high efficiency.

[0194] The above merely provides the specific implementation of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A power management module, characterized by, The power management module comprises a power supply chip, a first power conversion circuit and a second power conversion circuit, the power supply chip is used for connecting a power supply, the power supply chip comprises a controller, one end of the first power conversion circuit and one end of the second power conversion circuit are connected with the controller respectively, and the other end of the first power conversion circuit and the other end of the second power conversion circuit are used for connecting a load; the maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit; The first power conversion circuit and the second power conversion circuit are used for converting the voltage output by the power supply; The controller is used for receiving a load demand voltage of the load and obtaining a load current, and controlling the first power conversion circuit or the second power conversion circuit to work according to the load demand voltage and the load current, wherein the load current is the current output by the power management module to the load.

2. The power management module of claim 1, wherein, The controller is specifically used for: controlling the first power conversion circuit to work when the load demand voltage is less than a voltage threshold value and the load current is less than a first current threshold value; and controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold value or the load current is greater than or equal to the first current threshold value.

3. The power management module of claim 2, wherein, The first power conversion circuit and the second power conversion circuit each comprise a switching tube and an inductor, the inductor of the first power conversion circuit and the inductor of the second power conversion circuit are located outside the power supply chip, the switching tube in the first power conversion circuit is integrated in the power supply chip, and the switching tube in the second power conversion circuit is located outside the power supply chip.

4. The power management module of claim 3, wherein, The power management module further comprises a third power conversion circuit, the maximum output power of the third power conversion circuit is greater than or equal to the maximum output power of the second power conversion circuit, the inductor and the switching tube in the third power conversion circuit are located outside the power supply chip, and the controller is specifically used for: controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold value and the load current is less than the first current threshold value; controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold value and the load current is less than a second current threshold value; controlling the second power conversion circuit to work when the load demand voltage is less than the voltage threshold value and the load current is greater than or equal to the first current threshold value and less than the second current threshold value; and controlling the second power conversion circuit and the third power conversion circuit to work when the load current is greater than or equal to the second current threshold value. The second current threshold value is greater than the first current threshold value.

5. The power management module of claim 3, wherein, The power management module further comprises a fourth power conversion circuit, a maximum output power of the fourth power conversion circuit is greater than or equal to a maximum output power of the first power conversion circuit and less than a maximum output power of the second power conversion circuit, an inductor in the fourth power conversion circuit is located outside the power supply chip, and a switch tube in the fourth power conversion circuit is integrated in the power supply chip; and the controller is specifically used for: controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is less than a first current threshold; controlling the first power conversion circuit to work and the fourth power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than a third current threshold; controlling the first power conversion circuit and the fourth power conversion circuit to stop working and controlling the second power conversion circuit to work when the load current is greater than or equal to the third current threshold; controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold; wherein the third current threshold is greater than the first current threshold.

6. The power management module of claim 2, wherein, The first power conversion circuit and the second power conversion circuit each comprise a switch tube and an inductor, and the switch tubes and the inductors in the first power conversion circuit and the second power conversion circuit are located outside the power supply chip.

7. The power management module of claim 6, wherein, The power management module further comprises a fifth power conversion circuit, a maximum output power of the fifth power conversion circuit is greater than or equal to a maximum output power of the second power conversion circuit, and the switch tube and the inductor in the fifth power conversion circuit are located outside the power supply chip; and the controller is specifically used for: controlling the first power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold; controlling the second power conversion circuit to work when the load demand voltage is greater than or equal to the voltage threshold and the load current is less than a fourth current threshold, the fourth current threshold being greater than the first current threshold; controlling the second power conversion circuit to work when the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the fourth current threshold; controlling the second power conversion circuit and the fifth power conversion circuit to work when the load current is greater than or equal to the fourth current threshold.

8. The power management module of claim 2, wherein, The first power conversion circuit and the second power conversion circuit each comprise a switch tube and an inductor, and the inductors in the first power conversion circuit and the second power conversion circuit are located outside the power supply chip, and the switch tubes in the first power conversion circuit and the second power conversion circuit are integrated in the power supply chip.

9. The power management module of claim 8, wherein, The power management module further comprises a sixth power conversion circuit, a maximum output power of the sixth power conversion circuit being greater than or equal to a maximum output power of the second power conversion circuit; an inductor in the sixth power conversion circuit is located outside the power supply chip, and a switch tube in the sixth power conversion circuit is also integrated in the power supply chip; the controller is specifically configured to: control the first power conversion circuit to work in a case where the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold; control the second power conversion circuit to work in a case where the load demand voltage is greater than or equal to the voltage threshold and the load current is less than a fifth current threshold, the fifth current threshold being greater than the first current threshold; control the second power conversion circuit to work in a case where the load demand voltage is less than the voltage threshold and the load current is greater than or equal to the first current threshold and less than the fifth current threshold; control the second power conversion circuit and the sixth power conversion circuit to work in a case where the load current is greater than or equal to the fifth current threshold.

10. The power management module of any of claims 2-9, wherein, The first current threshold is determined based on a maximum current-carrying capacity of a switch tube in the first power conversion circuit, and the voltage threshold is determined based on a maximum voltage-withstanding capacity of the switch tube in the first power conversion circuit.

11. The power management module of any of claims 2-5, wherein, A turn-on impedance of the switch tube in the first power conversion circuit is greater than a first threshold, and a turn-on impedance of a switch tube in the second power conversion circuit is less than a second threshold, the second threshold being less than the first threshold.

12. The power management module of any one of claims 1-11, wherein, The load comprises a display device, and each of the power conversion circuits is configured to provide a negative voltage power supply for the display device.

13. A display module, characterized by The display module comprises the power management module and the display device, an input end of the power management module being configured to be connected to a power supply, an output end of the power management module being configured to be connected to the display device, and the power management module being configured to convert and output a voltage provided by the power supply to the display device.

14. A power supply chip, characterized by The power supply chip comprises a controller, the power supply chip being configured to be connected to a power supply, and the controller being configured to be connected to one end of a first power conversion circuit and one end of a second power conversion circuit; the other end of the first power conversion circuit and the other end of the second power conversion circuit being configured to be connected to a load, a maximum output power of the first power conversion circuit being less than a maximum output power of the second power conversion circuit; The first power conversion circuit and the second power conversion circuit are configured to convert a voltage output by the power supply; The controller is configured to receive a load demand voltage of the load and obtain a load current, and control the first power conversion circuit or the second power conversion circuit to work according to the load demand voltage and the load current, the load current being a current received by the load.

15. The power supply chip of claim 14, wherein, The controller is specifically configured to: control the first power conversion circuit to work in a case where the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold; In a case that the load demand voltage is greater than or equal to a voltage threshold, or the load current is greater than or equal to a first current threshold, the second power conversion circuit is controlled to work.

16. The power supply chip of claim 15, wherein, The controller is further configured to connect one end of a fifth power conversion circuit, another end of the fifth power conversion circuit is configured to connect the load, and a maximum output power of the fifth power conversion circuit is greater than or equal to a maximum output power of the second power conversion circuit; and the controller is specifically configured to: In a case that the load demand voltage is less than the voltage threshold, and the load current is less than the first current threshold, the first power conversion circuit is controlled to work; In a case that the load demand voltage is greater than or equal to the voltage threshold, and the load current is less than a fourth current threshold, the second power conversion circuit is controlled to work, and the fourth current threshold is greater than the first current threshold; In a case that the load demand voltage is less than the voltage threshold, and the load current is greater than or equal to the first current threshold and less than the fourth current threshold, the second power conversion circuit is controlled to work; In a case that the load current is greater than or equal to the fourth current threshold, the second power conversion circuit and the fifth power conversion circuit are controlled to work.

17. An electronic device, comprising: The electronic device comprises the power management module according to any one of claims 1-12, the display module according to claim 13, or the power chip according to any one of claims 14-16.

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