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

Abstract

The invention provides a power management module, a display module, a power chip and electronic equipment. The power supply 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 being connected with a power supply, and 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 respectively connected with the controller, and the other end of the first power conversion circuit and the other end of the second power conversion circuit are respectively connected with a load; the maximum output power of the first power conversion circuit is smaller than that of the second power conversion circuit; each power conversion circuit is used for converting the voltage output by the power supply; the controller is used for receiving load demand voltage of the load and obtaining load current, the first power conversion circuit or the second power conversion circuit is controlled to work according to the load demand voltage and the load current, and the load current is current output to the load by the power management module. High power and high efficiency can be considered.

Description

Technical Field

[0001] The present application relates to the display field, and in particular to a power management module, a display module, a power chip and an electronic device. Background Art

[0002] With the evolution of materials and technology, the weight and volume of display panels in various electronic devices are gradually reduced. Types of display panels include liquid crystal displays, field emission displays, plasma display panels, and organic light-emitting diode displays. Organic light-emitting diode (OLED) displays have the characteristics of fast response speed, excellent color purity and brightness, high contrast, and wide viewing angle. Generally, OLED displays include active matrix OLED (AMOLED) displays. AMOLED drives the light-emitting diode through a driving circuit, which can achieve large size and high resolution and has good development prospects.

[0003] The AMOLED display includes pixels arranged in a matrix state, and the organic light-emitting element (Organic Electro-Luminescence, OEL) (abbreviated as organic EL) in each pixel is driven and controlled to emit light under a certain voltage. The higher the brightness and the larger the size of the AMOLED, the higher the power and the greater the number of the corresponding organic light-emitting elements. Correspondingly, the higher the power demand for the power supply (abbreviated as EL power supply) that provides positive and negative voltages for the organic light-emitting elements. In addition, the EL power supply accounts for the largest proportion of power in large-size, high-brightness AMOLED displays, so the efficiency of the EL power supply determines the power efficiency of the entire AMOLED display.

[0004] Large-size AMOLED displays can be used in a variety of electronic devices such as large-screen mobile phones, tablets, notebooks, desktops, etc. At present, some AMOLED displays meet the power requirements of the equipment and achieve current sharing by setting two symmetrical power conversion circuits in the EL power supply. However, the EL power supplies in these devices cannot take into account both high power and high efficiency. Summary of the invention

[0005] The present application provides a power management module, a display module, a power chip and an electronic device that can achieve both high power and high efficiency.

[0006] In the first aspect, the present application provides a power management module, which includes a power chip, a first power conversion circuit and a second power conversion circuit. The power chip is used to connect the 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 respectively 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 respectively used to connect the 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 both used to convert the voltage output by the power supply; the controller is used to receive the load demand voltage of the load and obtain the 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 output by the power management module to the load. Among them, the power conversion circuit may include a DC to DC circuit. Exemplarily, the power conversion circuit can be a reverse Buck-Boost circuit, that is, a buck-boost conversion circuit that generates a negative voltage, which is used to convert the positive voltage provided by the power supply into a negative voltage and output it for use by the load.

[0007] In the present application, the maximum output power of the first power conversion circuit and the second power conversion circuit are different, so the power output capacity is different. The power conversion circuit with lower power output capacity (referring to the first power conversion circuit) includes a switch tube with better dynamic parameters, lower switching loss and driving loss, and controls the first power conversion circuit to work under light load, and the power efficiency is higher; the power conversion circuit with higher power output capacity (referring to the second power conversion circuit) includes a switch tube with lower conduction impedance, so when the second power conversion circuit is controlled to work under heavy load, the conduction loss is low, and a higher output power can be supported. By setting power conversion circuits with different power output capabilities, and adjusting the appropriate power conversion circuit to work according to the actual load demand voltage and load current, different load requirements can be met, thereby ensuring that the voltage and power ultimately output by the power management module meet the load requirements, and maintaining a higher power efficiency, taking into account both high efficiency and large output power.

[0008] In a feasible implementation, the controller is used to:

[0009] When the load demand voltage is less than the voltage threshold, and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0010] 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, the second power conversion circuit is controlled to operate.

[0011] In 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 capacity of the two is different, so 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 load current are small, the first power conversion circuit works, and the circuit is in a light load state. Since the current carrying capacity and withstand voltage of the devices in the first power conversion circuit are smaller, the power supply efficiency is higher under light load conditions. When the load demand voltage or load current is large, the second power conversion circuit works, and the circuit may be in a medium load or heavy load state. Compared with the first power conversion circuit, the second power conversion circuit has a larger current carrying capacity and withstand voltage, and the power supply efficiency is higher under medium load or heavy load conditions. 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, so that the devices in the first power conversion circuit can be protected.

[0012] In a feasible implementation, the first power conversion circuit and the second power conversion circuit both include switching tubes and inductors, the inductors in the first power conversion circuit and the second power conversion circuit are both located outside the above-mentioned power chip, the switching tube in the above-mentioned first power conversion circuit is integrated in the above-mentioned power chip, and the switching tube in the above-mentioned second power conversion circuit is located outside the above-mentioned power chip.

[0013] In this application, the switch tube in the first power conversion circuit is integrated into the power chip, and a switch tube with good dynamic parameters can be selected to reduce switching losses. The switch tube in the second power conversion circuit is set outside the power chip, and a switch tube with small on-resistance can be selected to reduce heat generation and increase output power. Accordingly, the first power conversion circuit is controlled to work under light load conditions to improve the power supply efficiency under light load conditions. The second power conversion circuit is controlled to work under heavy load conditions to increase output power. In this way, high efficiency and high output power can be taken into account, and a variety of application scenarios can be adapted.

[0014] In a feasible implementation, 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 switch tube in the third power conversion circuit are located outside the power chip; the controller is specifically used for:

[0015] When the load demand voltage is less than the voltage threshold, and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0016] When the load demand voltage is greater than or equal to the voltage threshold, and the load current is less than the second current threshold, controlling the second power conversion circuit to operate;

[0017] 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 second current threshold, controlling the second power conversion circuit to operate;

[0018] When the load current is greater than or equal to the second current threshold, controlling the second power conversion circuit and the third power conversion circuit to operate;

[0019] Wherein, the second current threshold is greater than the first current threshold.

[0020] In the present application, a low-power phase (referring to the first power conversion circuit) built into the switch tube and two high-power phases (including the second power conversion circuit and the third power conversion circuit) external to the switch tube are set. According to the load demand voltage and the load current, the low-power phase is controlled to work alone, the high-power phase is controlled to work alone, and the two high-power phases are controlled to work in parallel. The load requirements can be met for light load, medium load, and heavy load conditions respectively, the power supply efficiency is improved under light load conditions, and a greater output power is provided under heavy load conditions, thereby meeting the requirements of different scenarios and achieving both high efficiency and high power.

[0021] In a feasible implementation, 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 chip, and the switch tube in the fourth power conversion circuit is integrated in the power chip; the controller is specifically used for:

[0022] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0023] 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, control the first power conversion circuit and the fourth power conversion circuit to operate;

[0024] When the load current is greater than or equal to the third current threshold, the first power conversion circuit and the fourth power conversion circuit are controlled to stop working, and the second power conversion circuit is controlled to work;

[0025] When the load demand voltage is greater than or equal to the voltage threshold, controlling the second power conversion circuit to operate;

[0026] Wherein, the third current threshold is greater than the first current threshold.

[0027] In the present application, by setting two low-power phases built into the switching tube (referring to the first power conversion circuit and the fourth power conversion circuit) and a high-power phase external to the switching tube (including the second power conversion circuit), according to the load demand voltage and the load current, one low-power phase is controlled to work alone, two low-power phases work together, and the high-power phase works alone, respectively. The load requirements can be met for light load, medium load, and heavy load states, respectively, the power supply efficiency is improved under light load and medium load states, and a larger output power is provided under heavy load state, thereby meeting the requirements of different scenarios and achieving both high efficiency and high power.

[0028] In a feasible implementation, the first power conversion circuit and the second power conversion circuit both include a switch tube and an inductor, and the switch tube and the inductor in the first power conversion circuit and the second power conversion circuit are both located outside the above-mentioned power chip.

[0029] In the present application, since the switch tubes in the first power conversion circuit and the second power conversion circuit are both located outside the power chip, the switch tubes in each power conversion circuit can be selected to have a smaller on-resistance, and these power conversion circuits have better heat dissipation and stronger load capacity when working. When the load demand voltage and load current are different, different power conversion circuits can be controlled to work, such as controlling the first power conversion circuit to work when the load is light, and controlling the second power conversion circuit to work when the load is heavy, which can improve the power supply efficiency under light load conditions and improve the output power under heavy load conditions.

[0030] In a feasible implementation, 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 switch tube and the inductor in the fifth power conversion circuit are both located outside the power chip; the controller is specifically used for:

[0031] When the load demand voltage is less than the voltage threshold, and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0032] 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, controlling the second power conversion circuit to operate, and the fourth current threshold is greater than the first current threshold;

[0033] 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 to operate;

[0034] When 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 operate.

[0035] In the present application, by controlling the low-power phase to work alone, the high-power phase to work alone, and the two high-power phases to work together according to the load demand voltage and load current, the load demand can be met according to different load conditions. The power supply efficiency is improved under light load conditions, and a larger output power is provided under heavy load conditions, thereby improving the overall current output capacity and voltage output capacity, thereby meeting the needs of different scenarios and achieving both high efficiency and high power.

[0036] In a feasible implementation, the first power conversion circuit and the second power conversion circuit both include switching tubes and inductors, the inductors in the first power conversion circuit and the second power conversion circuit are both located outside the power chip, and the switching tubes in the first power conversion circuit and the second power conversion circuit are both integrated in the power chip.

[0037] 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 chip, the appropriate power conversion circuits are controlled to work under different load conditions, which can 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 load current, and the control is more precise, and the switch tube parameters of the first power conversion circuit and the second power conversion circuit can be designed more precisely, and the efficiency is higher.

[0038] In a feasible implementation, 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 chip, and the switch tube in the sixth power conversion circuit is also integrated in the power chip; the controller is specifically used for:

[0039] When the load demand voltage is less than the voltage threshold, and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0040] When 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 operate, and the fifth current threshold is greater than the first current threshold;

[0041] 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 fifth current threshold, controlling the second power conversion circuit to operate;

[0042] When 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 operate.

[0043] In the present application, by controlling the low-power phase to work alone, the high-power phase to work alone, and the two high-power phases to work together according to the load demand voltage and the load current, the load demand can be met for different load conditions, and the control for each load state can be more precise, which can improve efficiency. At the same time, the parameters of the switch tubes in each power conversion circuit can be designed more precisely to further improve efficiency. In a feasible implementation method, the above-mentioned first current threshold is determined based on the maximum current carrying capacity of the switch tube in the above-mentioned first power conversion circuit, and the above-mentioned voltage threshold is determined based on the maximum withstand voltage capacity of the switch tube in the above-mentioned first power conversion circuit.

[0044] In the present application, by setting a suitable first current threshold and voltage threshold, it is possible to prevent overcurrent and overvoltage from occurring easily during operation of the first power conversion circuit, thereby protecting the device and improving the safety of the circuit.

[0045] In a feasible implementation, the on-resistance of the switch tube in the first power conversion circuit is greater than the first threshold.

[0046] In this application, the switch tube in the power conversion circuit integrated in the power chip does not work when it is heavily loaded, and does not need to meet a large current capacity. Therefore, a switch tube with a larger on-resistance than a conventional switch tube can be selected. The dynamic parameters of the switch tube are better, which can greatly reduce the switching loss and driving loss when the first power conversion circuit works under light load conditions, and improve the power supply efficiency under light load conditions. At the same time, since the switch tube in the first power conversion circuit does not require additional packaging, the area of ​​the power management module can be reduced while improving efficiency.

[0047] In a feasible implementation, the on-resistance of the switch tube in the second power conversion circuit is less than a second threshold, and the second threshold is less than the first threshold.

[0048] In this application, the switch tube set outside the power chip does not work under light load conditions, and there is no need to consider the switching loss of the switch tube. Therefore, a switch tube with a smaller on-resistance than a conventional switch tube can be selected. The dynamic parameters of the switch tube are relatively large, the on-resistance is better, and the on-loss is smaller when the second power conversion circuit is working, the heat is reduced, and the current capacity is improved. At the same time, because the switch tube in the second power conversion circuit is located outside the power chip, it has a separate package compared to the switch tube integrated in the power chip, the heat dissipation capacity is better, and the output power capacity can be stronger.

[0049] In a feasible implementation, the load includes a display device, and each of the power conversion circuits is used to provide a negative voltage power supply for the display device.

[0050] In the second aspect, the present application also provides a display module, which includes a power management module and a display device as in the first aspect and any feasible implementation of the first aspect, wherein the input end of the power management module is used to connect to a power source, the output end of the power management module is used to connect to the display device, and the power management module is used to convert the voltage provided by the power source and output it to the display device.

[0051] In a third aspect, the present application further provides a power chip, the power chip including a controller, the power chip is used to connect a power supply, the controller is used to connect 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 to connect a load, and the first power conversion circuit and the second power conversion circuit are both used to convert the voltage output by the power supply; the controller is used to:

[0052] Receive the load demand voltage of the load and obtain the load current, and control the first power conversion circuit or the second power conversion circuit to operate according to the load demand voltage and the load current, wherein the load current is the current received by the load.

[0053] In a feasible implementation, the controller is used to:

[0054] When 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 operate.

[0055] 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, controlling the second power conversion circuit to operate;

[0056] In a feasible implementation, the controller is further used to connect one end of a fifth power conversion circuit, the other end of the fifth power conversion circuit is used 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; the controller is used to:

[0057] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0058] 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, controlling the second power conversion circuit to operate, and the fourth current threshold is greater than the first current threshold;

[0059] 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 fourth current threshold, controlling the second power conversion circuit to operate;

[0060] When 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 operate.

[0061] In a fourth aspect, the present application also provides an electronic device, comprising a power management module as in the first aspect and any feasible implementation of the first aspect, a display module as in the second aspect, or a power chip as in the third aspect and any feasible implementation of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A schematic diagram of a power management module provided in an embodiment of the present application;

[0063] Figure 2 A schematic diagram of a flow chart of a control method provided in an embodiment of the present application;

[0064] Figure 3 Another schematic diagram of a control method according to an embodiment of the present invention;

[0065] Figure 4 Another structural diagram of the power management module provided in an embodiment of the present application;

[0066] Figure 5 Another structural diagram of the power management module provided in the embodiment of the present application;

[0067] Figure 6 Another structural diagram of the power management module provided in the embodiment of the present application;

[0068] Figure 7 Another structural diagram of the power management module provided in the embodiment of the present application;

[0069] Figure 8 Another structural diagram of the power management module provided in the embodiment of the present application;

[0070] Fig. 9 Another structural diagram of the power management module provided in the embodiment of the present application;

[0071] Fig.10 Another structural diagram of the power management module provided in the embodiment of the present application;

[0072] Fig.11 A schematic diagram of the structure of a power chip provided in an embodiment of the present application;

[0073] Fig.12 A schematic diagram of the structure of a display module provided in an embodiment of the present application;

[0074] Fig.13 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0076] The terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0077] It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0078] The power management module, display module, and power chip provided in this application can be applied to the field of terminal communications and used in various displays. The electronic devices provided in this application can include various devices with display screens, such as large-screen mobile phones, tablet computers, laptops, desktop computers, etc.

[0079] Combine the following Figure 1-Figure 11 The power management module, display module, power chip and electronic device provided in this application are introduced.

[0080] See also Figure 1 , Figure 1 A schematic diagram of a power management module provided in an embodiment of the present application. Figure 1 As shown, the power management module may include a power chip, a first power conversion circuit (such as Figure 1 The power conversion circuit 1 in the embodiment of the present invention) and the second power conversion circuit (such as Figure 1 The power conversion circuit 2 in the embodiment of the present invention is used to connect the power supply, and the power supply chip includes a controller; one end of the first power conversion circuit and one end of the second power conversion circuit are respectively 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 respectively used to connect the load. The maximum output power of the first power conversion circuit is less than the maximum output power of the second power conversion circuit.

[0081] In other words, the power management module includes a power chip and multiple power conversion circuits. Each power conversion circuit is connected to a controller in the power chip. The output end of each power conversion circuit is used to connect a load; at least two of the multiple power conversion circuits have different maximum output powers; wherein the maximum output power of the first power conversion circuit among the multiple power conversion circuits is less than the maximum output power of the second power conversion circuit.

[0082] 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 may include a direct current (DC) to direct current circuit. Exemplarily, the power conversion circuit may be a reverse Buck-Boost circuit, that is, a step-up and step-down conversion circuit that generates a negative voltage, which is used to convert the positive voltage provided by the power supply into a negative voltage and output it for use by the load.

[0083] In a possible implementation manner, the load may include a display device, and each of the power conversion circuits is used to provide a negative voltage power supply for the display device. Figure 1 The load is used as a display device for example. The power chip, the first power conversion circuit and the second power conversion circuit can form Figure 1 The ELVSS power supply is shown in the example. Figure 1 As shown, the power management module may further include an ELVDD power supply, and the ELVDD power supply may be used to provide a positive voltage for the display device.

[0084] It is understandable 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 these power conversion circuits are different, indicating that the power output capabilities of these power conversion circuits are different, and some power conversion circuits can output less power, while other parts can output more power. By setting these power conversion circuits with different power output capabilities in the power management module, it can adapt to various application scenarios and provide appropriate power supply for loads with different requirements.

[0085] The controller in the power management module can be used to receive the load demand voltage of the load and obtain the load current, and control the operation of the first power conversion circuit or the second power conversion circuit according to the load demand voltage and the load current. The load current is the current output by the power management module to the load.

[0086] The load demand voltage can be obtained through software, without the need for detection through a hardware circuit, and the control process is simple. In other words, the controller can receive the load amplitude demand voltage.

[0087] The load current can be the load current obtained by the ELVDD power supply in the power management module. In this way, the existing current detection circuit in the power management module can be reused. There is no need to design additional current detection circuits for different power conversion circuits in the ELVDD power supply, which can simplify circuit design and reduce volume.

[0088] That is to say, the power management module provided by the present application can adjust different power conversion circuits to work according to actual conditions. When the load demand changes, the working power conversion circuit is adjusted accordingly, so as to ensure that the voltage finally output by the power management module meets the load demand; the working power conversion circuit is adjusted according to the load demand voltage and load current, so as to ensure that the devices in the power conversion circuit can work safely within their capabilities, thereby maintaining a high power efficiency. In other words, by selecting the appropriate power conversion circuit to work according to the load demand voltage and load current, it is possible to maintain a high working efficiency while taking into account the output power requirements.

[0089] In a possible implementation, the controller in the power management module may be used to:

[0090] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0091] 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, the second power conversion circuit is controlled to operate.

[0092] Among them, the above-mentioned first current threshold can be determined based on the maximum current-carrying capacity of the switching tube in the first power conversion circuit, and the above-mentioned voltage threshold can be determined based on the maximum voltage-withstanding capacity of the switching tube in the first power conversion circuit.

[0093] Here, since the power conversion circuit mentioned in this application converts the positive voltage provided by the power supply into a negative voltage, the load demand voltage is greater than or equal to the voltage threshold, which may mean that the absolute value of the load demand voltage is greater than or equal to the voltage threshold. When the load demand voltage is compared with the voltage threshold in the following text, it can be understood that the absolute value of the load demand voltage is compared with the voltage threshold.

[0094] Specifically, the first current threshold value needs to be less than the maximum current capacity of the switch tube in the first power conversion circuit. In addition, the best efficiency point can be calculated in combination with the dynamic parameters and on-resistance of the switch tube to determine the first current threshold value. During the operation of the first power conversion circuit, its working 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 value, so that the efficiency is higher. The first current threshold value can be modified by software to adapt to different application scenarios and different electronic devices. The above voltage threshold value needs to be less than the maximum withstand voltage of the switch tube in the first power conversion circuit. The voltage threshold value is designed. When the user uses the power control module, the voltage threshold value cannot be modified by software. This ensures that the switch tube 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 possibility of damage is low. Exemplarily, the negative pressure required by the load can be in the range of -16V to 0V, the first current threshold value can be in the range of 100 to 800mA, and the voltage threshold value can be in the range of 4V to 12V. When the absolute value of the load demand voltage is greater than or equal to the voltage threshold value, 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 indicates that the load demand voltage is relatively small.

[0095] In the embodiment of the present application, since the maximum output powers of the first power conversion circuit and the second power conversion circuit are different, it means that the power output capabilities of the two are different, so the maximum current or maximum voltage that the devices in the two circuits can withstand when working is also different. That is, the maximum current (which can be called current carrying capacity) and the maximum voltage (which can be called withstand voltage) that the devices in the two power conversion circuits can withstand are different.

[0096] For the first power conversion circuit, the maximum current and the maximum voltage that the devices in the circuit can withstand are relatively small.

[0097] 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, thereby ensuring that the device is not easily damaged when the first power conversion circuit is working. 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, which reduces the possibility of damage to the device in the first power conversion circuit, realizes the protection of the device, and improves the working reliability. 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 and withstand voltage of the device in the first power conversion circuit are 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 may be in a medium load or heavy load state. Compared with the first power conversion circuit, the current carrying capacity and withstand voltage of the device of the second power conversion circuit are larger, and the power supply efficiency is higher in the medium load or heavy load state.

[0098] In this way, by adjusting the working power conversion circuit according to the load demand voltage and load current, it is possible to meet the load demand, improve the power supply efficiency, and protect the circuit components.

[0099] In addition, since the first power conversion circuit and the second power conversion circuit do not operate at the same time, there is basically no problem of current unevenness.

[0100] It is understandable that compared with the device that adjusts the operation of the corresponding power conversion circuit according to the power size, the present application controls the working state of the first power conversion circuit and the second power conversion circuit in the power management module according to the load demand voltage and the load current, and 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, which can realize the protection of the first power conversion circuit and avoid damage to the components in the first power conversion circuit. The control process is more detailed and the reliability is higher.

[0101] Furthermore, the first power conversion circuit is more precisely controlled and protected, and the switch tube parameters of the first power conversion circuit can be designed more precisely, and the efficiency is higher.

[0102] The following describes the process of the controller controlling the operation of different power conversion circuits during changes in load current and load demand voltage with reference to a specific flow chart.

[0103] In the present application, a power conversion circuit with a smaller maximum output power can be called a low-power phase, and a power conversion circuit with a larger maximum output power can be called a high-power phase. For example, the above-mentioned first power conversion circuit and the second power conversion circuit can be called a low-power phase and a high-power phase, respectively.

[0104] When the power management module starts to work, the load current starts to increase from 0, so the first power conversion circuit starts to work first, which can ensure higher power efficiency. When the power management module starts to work and receives the load demand voltage, it is understandable that the load demand voltage changes from 0 when it is not working to a non-zero value. Subsequently, according to the actual value of the load demand voltage and the value of the load current, the first power conversion circuit or the second power conversion circuit can be controlled to work, adapt to the actual needs of the load, output appropriate power, and try to ensure higher efficiency. For details, please refer to the following Figure 2 and Figure 3 Steps shown.

[0105] See also Figure 2 ,like Figure 2 As shown, Figure 2 A flow chart of a control method provided in an embodiment of the present application. Figure 2 As shown, the method includes but is not limited to the following steps:

[0106] Step S201, receiving an instruction to increase the output voltage.

[0107] Step S202, determining whether the low-power phase is working.

[0108] If yes, execute step S203; if no, execute step S205.

[0109] Step S203, determining whether the absolute value of the boosted output voltage is greater than or equal to a voltage threshold.

[0110] If yes, execute step S204; if no, execute step S205.

[0111] Step S204, controlling the low-power phase to stop working and controlling the high-power phase to work.

[0112] Step S205, executing an instruction to increase the output voltage.

[0113] In this embodiment, when the absolute value of the load demand voltage increases, the power control module receives an instruction to increase the output voltage, and determines whether the low-power phase (such as the first power conversion circuit) is working at this time. If the low-power phase is not working, the output voltage can be directly increased; if the low-power phase is working, it is further determined that if the absolute value of the output voltage after the increase is less than the voltage threshold, the output voltage can be directly increased; if the absolute value of the output voltage after the increase is greater than or equal to the voltage threshold, the high-power phase (such as the second power conversion circuit) can be controlled to work instead of the low-power phase, and then the output voltage can be increased. In this way, the low-power phase can be prevented from working when the output voltage is large, and the switch tube in the low-power phase can be protected from burning.

[0114] In one embodiment, the boosted output voltage may refer to the boost target value indicated in the received instruction for boosting the output voltage (referred to as the boost instruction), and the boost target value in the instruction is compared with the voltage threshold to determine whether the power phase needs to be adjusted, so that the appropriate power phase can be operated. That is to say, in actual applications, the voltage can be measured without hardware, but the boost target value can be obtained by software (referring to the boost instruction), thereby obtaining the load demand voltage and realizing the control of the power phase, which can simplify the measurement steps, simplify the control process, and improve the control efficiency.

[0115] See also Figure 3 ,like Figure 3 As shown, Figure 3 A flow chart of another control method provided in an embodiment of the present application. Figure 3 As shown, the method includes but is not limited to the following steps:

[0116] Step S301, receiving an instruction to reduce the output voltage.

[0117] Step S302, executing an instruction to reduce the output voltage.

[0118] Step S303, determining whether the low-power phase is working.

[0119] If yes, execute step S307; if no, execute step S304.

[0120] Step S304, determining whether the absolute value of the reduced output voltage is greater than or equal to a voltage threshold.

[0121] If yes, execute step S307; if no, execute step S305.

[0122] Step S305, determining whether the load current is greater than or equal to a first current threshold.

[0123] If yes, execute step S307; if no, execute step S306.

[0124] Step S306, controlling the high-power phase to stop working and controlling the low-power phase to work.

[0125] Step S307, controlling the currently operating power phase to continue operating.

[0126] In this embodiment, when the absolute value of the load demand voltage becomes smaller, the power control module receives an instruction to reduce the output voltage, reduces the output voltage, and determines whether the low-power phase (such as 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 output voltage after the reduction 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 output voltage after the reduction 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 becoming smaller, so as to protect the low-power phase switch tube, or control the high-power phase to switch to the low-power phase to work, thereby improving the power supply efficiency.

[0127] In one embodiment, the output voltage after the reduction mentioned above may refer to the voltage reduction target value indicated in the received instruction for reducing the output voltage (referred to as the voltage reduction instruction), and the voltage reduction 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 to say, in actual applications, the voltage can be measured without hardware, but the voltage reduction target value can be obtained by software (referring to the voltage reduction instruction), thereby obtaining the load demand voltage and realizing the control of the power phase, which can simplify the measurement steps, simplify the control process, and improve the control efficiency.

[0128] In a possible implementation, the load current 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 load current required by this implementation can be obtained by reusing the data of the load current obtained through the ELVDD power supply. In this way, the current detection circuit corresponding to the ELVDD power supply can be reused in the power management module, and there is no need to design an independent current detection circuit for each power phase in the ELVSS power supply, that is, there is no need to add an additional current detection circuit, which can simplify the circuit design and simplify the implementation, which is conducive to reducing the size of the power management module.

[0129] Please also see Figure 4 , Figure 4 Another structural schematic diagram of the power management module provided in an embodiment of the present application. Figure 4 is Figure 1Based on the Figure 4 As shown, 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 these power conversion circuits as reverse Buck-Boost circuits as an example, the power conversion circuit may include two switch tubes and an inductor (or a group of inductors). The switch tube may be an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field effect transistor (MOSFET) (MOS tube for short), etc., and the present application does not limit this. Taking the switch tube as a MOS tube as an example, the two switch tubes in the power conversion circuit may be NMOS and NMOS. Optionally, the two switch tubes may also be NMOS and PMOS. Figure 4 The relative position relationship between the switch tube and inductor and the power chip in each power conversion circuit is shown in FIG. Figure 4 As shown, the first power conversion circuit (such as Figure 4 The power conversion circuit 1 in the embodiment of the present invention) and the second power conversion circuit (such as Figure 4 The inductors in the power conversion circuit 2) are all located outside the power chip, the switching tubes in the first power conversion circuit are integrated in the power chip, and the switching tubes in the second power conversion circuit are located outside the power chip.

[0130] Optionally, the on-impedance of the switch tube in the first power conversion circuit may be greater than the first threshold. The first threshold may be determined based on the on-impedance of some conventional switch tubes. These conventional switch tubes are used in a power management module including one or more power conversion circuits, and these conventional switch tubes are fully integrated in the power chip. These conventional switch tubes need to ensure a smaller on-impedance to meet certain current-carrying capacity requirements, so the dynamic parameters are large and the light-load efficiency is low. Different from 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 relatively large on-impedance 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 the gate drive of the switch tube, the input capacitance Ciss, etc., are better, which can greatly reduce the switching loss and drive loss when the first power conversion circuit is working under light load conditions, and improve the power supply efficiency under light load conditions.

[0131] At the same time, since the switch tube in the first power conversion circuit is integrated in the power chip, compared with setting the switch tube outside the power chip, no additional packaging is required, and various impedances and dynamic parameters are better, which can improve efficiency while reducing the area of ​​the power management module. In other words, in the power management module provided by the present application, the switch tube in the first power conversion circuit is set in the power chip, and the switch tube in the second power conversion circuit is set outside the power chip. Compared with the power management module in which the switch tubes in the power conversion circuit are all set outside the power chip, the packaging of the switch tube in the first power conversion circuit can be reduced, the dynamic parameters of the switch tube are better, the requirements for inductance are reduced, the efficiency can be improved, and the area can be reduced.

[0132] In addition, the maximum withstand voltage of the switch tube in the first power conversion circuit may be less than the preset withstand voltage value, and the preset withstand voltage value may refer to the maximum withstand voltage of the conventional switch tube mentioned above. In other words, the switch tube in the power conversion circuit integrated in the power chip in the present application may be a switch tube with a smaller withstand voltage, so that the switch tube has smaller switching losses and higher power efficiency when working, and the chip wafer area can be smaller during manufacturing, thereby reducing the volume.

[0133] Optionally, the on-impedance of the switch tube in the second power conversion circuit is less than the 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-impedance of other conventional switch tubes. These conventional switch tubes are used in a power management module including multiple power conversion circuits, and these conventional switch tubes are all located outside the power chip. These conventional switch tubes need to ensure appropriate dynamic parameters to meet higher switching frequencies and efficiency performance, so the on-impedance is large and the current carrying capacity is low. Different from this, the switch tube arranged outside the power chip in the embodiment of the present application does not work when lightly loaded, and there is no need to consider the switching loss problem. Therefore, a switch tube with a relatively small on-impedance can be selected. Compared with conventional switch tubes of the same process, the dynamic parameters of this switch tube are relatively large, the on-impedance is better, the conduction loss is smaller when the second power conversion circuit is working, the heat is reduced, and the current carrying capacity is improved.

[0134] At the same time, since the switch tube in the second power conversion circuit is located outside the power chip, it has a separate package compared to the switch tube integrated in the power chip, has better heat dissipation capability, and can have a stronger output power capability. In other words, in the power management module provided by the present application, the switch tube in the first power conversion circuit is arranged in the power chip, and the switch tube in the second power conversion circuit is arranged outside the power chip. Compared with the power management module in which the switch tubes in the power conversion circuit are all arranged in the power chip, since there is no need to consider the switching loss problem of the switch tube in the second power conversion circuit, the on-resistance is small, and there is an independent package, the heat dissipation capability of the switch tube is better, and the current flow capacity can be improved, thereby increasing the upper limit of the output power. In addition, the switch tube located outside the power chip is not restricted by the power chip, and the appropriate switch tube can be flexibly selected according to the application requirements, with low comprehensive cost, wide adaptability, and good working effect.

[0135] In the embodiment of the present application, by integrating the switch tube in the first power conversion circuit into the power chip and setting the switch tube in the second power conversion circuit outside the power chip, the first power conversion circuit can be controlled to work under light load conditions, thereby improving the power efficiency under light load conditions. Under heavy load conditions, the second power conversion circuit is controlled to work, thereby improving the output power. Thus, both high efficiency and output power can be taken into account, and various application scenarios can be adapted.

[0136] Please also see Figure 5 , Figure 5 Another structural schematic diagram of the power management module provided in an embodiment of the present application. Figure 5 is Figure 4 Based on Figure 5 As shown, the power management module may further include a third power conversion circuit (such as Figure 5 The power conversion circuit 3 in the power management module, 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 both located outside the power chip; the controller in the power management module can be specifically used for:

[0137] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0138] When the load demand voltage is greater than or equal to the voltage threshold and the load current is less than the second current threshold, controlling the second power conversion circuit to operate;

[0139] 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 second current threshold, controlling the second power conversion circuit to operate;

[0140] When the load current is greater than or equal to the second current threshold, controlling the second power conversion circuit and the third power conversion circuit to operate;

[0141] The second current threshold is greater than the first current threshold.

[0142] For example, the first current threshold may be in the range of 100 mA to 800 mA, and the second current threshold may be in the range of 500 mA to 2500 mA.

[0143] In the embodiment of the present application, the power output capacity of the third power conversion circuit and the second power conversion circuit is stronger than the power output capacity of the first power conversion circuit, and the power output capacity of the third power conversion circuit is similar to or stronger than the power output capacity of the second power conversion circuit. In this way, the current carrying capacity and withstand voltage of the switch tube, inductor and other devices in the third power conversion circuit are also relatively high. When the load current is large, such as greater than or equal to the first current threshold and less than the second current threshold, the second power conversion circuit can be controlled to work at this time, and the circuit may be in a medium load state, and one power conversion circuit can meet the load demand. When the load current is larger, such as greater than or equal to the second current threshold, the controller can control the second power conversion circuit and the third power conversion circuit to work together. At this time, the circuit may be in a heavy load state. The two power conversion circuits are connected in parallel to output power to the load, which can provide a larger voltage and power to meet the load demand.

[0144] It can be understood that when the load demand voltage is small (smaller than the voltage threshold) and the load current is small (smaller than the first current threshold), the controller can control the first power conversion circuit to operate. At this time, the circuit may be in a light load state, and the load demand can be met by using one power conversion circuit. Since the switching tube in the first power conversion circuit is integrated in the power chip, the power efficiency can be improved.

[0145] The present application sets a low-power phase built into the switch tube (referring to the first power conversion circuit) and at least two high-power phases external to the switch tube (including the second power conversion circuit and the third power conversion circuit). According to the load demand voltage and the load current, the small-power phase is controlled to work alone, the high-power phase is controlled to work alone, and the two high-power phases are controlled to work in parallel. The load requirements for light load, medium load, and heavy load conditions can be met respectively, the power supply efficiency can be improved under light load conditions, and a greater output power can be provided under heavy load conditions, thereby meeting the requirements of different scenarios and achieving both high efficiency and high power.

[0146] In addition, the switch tubes of the third power conversion circuit and the second power conversion circuit are both located outside the power chip. Switch tubes with smaller on-resistance can be selected to reduce conduction losses and heat generation, thereby improving the output power and output voltage depth of the power management module.

[0147] In addition, since the high-power phase and the low-power phase do not work at the same time, there is basically no problem of current unevenness.

[0148] Please also see Figure 6 , Figure 6 Another structural schematic diagram of the power management module provided in an embodiment of the present application. Figure 6 is Figure 4 Based on Figure 6 As shown, the upper power management module also includes a fourth power conversion circuit (such as Figure 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 chip, and the switch tube in the fourth power conversion circuit is integrated in the power chip; the controller can be specifically used for:

[0149] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0150] 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, control the first power conversion circuit and the fourth power conversion circuit to operate;

[0151] When the load current is greater than or equal to the third current threshold, the first power conversion circuit and the fourth power conversion circuit are controlled to stop working, and the second power conversion circuit is controlled to work;

[0152] When the load demand voltage is greater than or equal to the voltage threshold, controlling the second power conversion circuit to operate;

[0153] The third current threshold is greater than the first current threshold.

[0154] For example, the first current threshold may be in the range of 100 mA to 800 mA, and the third current threshold may be in the range of 500 mA to 2500 mA.

[0155] In the embodiment of the present application, the power output capacity 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 capacity of the fourth power conversion circuit is similar or slightly stronger than that of the first power conversion circuit. Therefore, the current carrying capacity and withstand voltage of the switch tube and the inductor in the fourth power conversion circuit are also 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 may be in a light load state, and the load demand can be met by working with one power conversion circuit with 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 may be in a medium load state, and the two power conversion circuits are connected in parallel to output power for the load to meet the load demand with high efficiency.

[0156] 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 operate. At this time, the circuit may be in an overloaded state. The load demand can be met by using the second power conversion circuit. Since the switching tube in the second power conversion circuit is located outside the power chip, heat can be reduced and a larger output power can be provided.

[0157] The present application sets two low-power phases built into the switching tube (referring to the first power conversion circuit and the fourth power conversion circuit) and a high-power phase outside the switching tube (including the second power conversion circuit and the third power conversion circuit). According to the load demand voltage and the load current, one low-power phase is controlled to work alone, two low-power phases to work together, and the high-power phase to work alone. The load requirements can be met for light load, medium load, and heavy load states respectively, the power supply efficiency is improved under light load and medium load states, and a larger output power is provided under heavy load state, thereby meeting the requirements of different scenarios and achieving both high efficiency and high power. Figure 6 The power management module shown is Figure 5 Compared with the power management module shown, its load capacity is slightly smaller under heavy load and is suitable for display devices with moderate power.

[0158] In addition, since the high-power phase and the low-power phase do not work at the same time, there is basically no problem of current unevenness.

[0159] Please also see Figure 7 , Figure 7 Another structural schematic diagram of the power management module provided in an embodiment of the present application. Figure 7 is Figure 1 Based on Figure 7 As shown, the first power conversion circuit (such as Figure 7The power conversion circuit 1 in the embodiment of the present invention) and the second power conversion circuit (such as Figure 7 The power conversion circuit 2) in the embodiment includes a switch tube and an inductor, and the switch tube and the inductor in each power conversion circuit are located outside the power chip.

[0160] In the embodiment of the present application, the power management module includes a first power conversion circuit and a second power conversion circuit with different power output capabilities, and the switch tubes in each power conversion circuit are located outside the power chip, so the switch tubes in each power conversion circuit can use switch tubes with smaller on-resistance, and these power conversion circuits have better heat dissipation and stronger load capacity when working. When the load demand voltage and load current are different, different power conversion circuits can be controlled to work, such as controlling the first power conversion circuit to work when the load is light, and controlling the second power conversion circuit to work when the load is heavy. The first power conversion circuit can be used to improve power efficiency in the light load state, and the second power conversion circuit can be used to improve output power in the heavy load state.

[0161] Please also see Figure 8 , Figure 8 This is another structural schematic diagram of the power management module provided in this application. Figure 8 is Figure 7 Based on Figure 8 As shown, the power management module may further include a fifth power conversion circuit (such as Figure 8 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 switch tube and the inductor in the fifth power conversion circuit are both located outside the power chip; the controller can be specifically used for:

[0162] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0163] 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 second power conversion circuit is controlled to operate, and the fourth current threshold is greater than the first current threshold;

[0164] 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 to operate;

[0165] When 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 operate.

[0166] Exemplarily, the first current threshold may be in the range of 100mA to 800mA, and the fourth current threshold may be in the range of 500mA to 2500mA. In an embodiment of the present application, the power management module may include a small power phase with an external switch tube (such as a first power conversion circuit) and at least two large power phases with external switches (such as a second power conversion circuit and a fifth power conversion circuit). According to the load demand voltage and 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. The load requirements can be met for different load conditions, the power efficiency is improved in a light load state, and a larger output power is provided in a heavy load state, thereby improving the overall current output capacity and voltage output capacity, so as to meet the requirements of different scenarios and achieve both high efficiency and high power. Figure 8 The power management module shown has a stronger load capacity under heavy load and can be applied to display devices with greater power requirements. Figure 8 compared to Figure 7 , the output power limit of the power management module that can be provided is higher, which can meet the greater power requirements of the load.

[0167] Please also see Fig. 9 , Fig. 9 Another structural schematic diagram of the power management module provided in an embodiment of the present application. Fig. 9 is Figure 1 Based on Fig. 9 As shown, the first power conversion circuit (such as Fig. 9 The power conversion circuit 1 in the embodiment of the present invention) and the second power conversion circuit (such as Fig. 9 The power conversion circuits 2) in the circuit include switching tubes and inductors. The inductors in each power conversion circuit are located outside the power chip, and the switching tubes in each power conversion circuit are integrated in the power chip.

[0168] In the embodiment of the present application, the power output capacity of the first power conversion circuit and the second power conversion circuit included in the power management module is different, and the switch tubes in each power conversion circuit are integrated into the power chip, so the switch tubes in each power conversion circuit can be selected with suitable on-resistance and dynamic parameters. Since the load demand voltage and load current are different and correspond to different load conditions, the appropriate power conversion circuit is controlled to work under different load conditions, which can 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, and the control 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, avoid the damage of the device in the first power conversion circuit, and the control process is more detailed and the reliability is higher. Further, the first power conversion circuit controls the protection more finely, and the switch tube parameters of the first power conversion circuit and the second power conversion circuit can be designed more finely, and the efficiency is higher.

[0169] Please also see Fig.10 , Fig.10 This is another structural schematic diagram of the power management module provided in this application. Fig.10 is Fig. 9 Based on Fig.10 As shown, the power management module may also include a sixth power conversion circuit (such as Fig.10 The sixth power conversion circuit is a power conversion circuit 6), wherein 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 chip, and the switch tube in the sixth power conversion circuit is also integrated in the power chip; the controller can be specifically used for:

[0170] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0171] When 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 operate, and the fifth current threshold is greater than the first current threshold;

[0172] 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 fifth current threshold, controlling the second power conversion circuit to operate;

[0173] When 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 operate.

[0174] For example, the first current threshold may be in the range of 100 mA to 800 mA, and the fifth current threshold may be in the range of 500 mA to 2500 mA.

[0175] In an embodiment of the present application, the power management module may include a low-power phase (such as a first power conversion circuit) and a high-power phase (such as a second power conversion circuit and a sixth power conversion circuit) in which both switching tubes are built-in. According to the load demand voltage and the load current, the low-power phase is controlled to work alone, the high-power phase is controlled to work alone, and the two high-power phases are controlled to work together. The load requirements can be met according to different load conditions, and different load states can be adapted. The control of each load state is more precise, which can improve efficiency. Fig.10 The control process of the power management module shown is more refined, and the power efficiency is higher while ensuring a certain power output capacity. In other words, Fig.10 compared to Fig. 9 , the power management module has higher efficiency and a higher output power limit, which can meet the greater power requirements of the load.

[0176] In a possible implementation, Figure 1 , Figure 4-Figure 10 In any of the illustrated power management modules, the controller can pre-set two sets of loop compensation parameters for each power conversion circuit according to the different inductance values ​​of each power conversion circuit. These two sets of loop compensation parameters (e.g., loop compensation parameter A1, 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 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 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, achieving both high output power and high power efficiency, and flexible application scenarios.

[0177] The present application also provides a power chip, Fig.11 A schematic diagram of the structure of a power chip provided in an embodiment of the present application. Fig.11As shown, the power chip may include a controller, the power chip is used to connect the power supply, the controller is used to connect one end of the first power conversion circuit and one end of the 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 to connect the load, the first power conversion circuit and the second power conversion circuit are both used to convert the voltage output by the power supply; the controller is used to:

[0178] Receive the load demand voltage of the load and obtain the load current, and control the first power conversion circuit or the second power conversion circuit to operate according to the load demand voltage and the load current, where the load current is the current received by the load.

[0179] In the embodiment of the present application, the power supply chip controls each power conversion circuit, and 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 load current. It can meet the load requirements for different load conditions and adapt to various application scenarios.

[0180] In a possible implementation, the controller in the power chip may be used to:

[0181] When 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 operate.

[0182] 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, the second power conversion circuit is controlled to operate.

[0183] In the embodiment of the present application, the controller controls the first power conversion circuit to operate when the load demand voltage and load current are small. Since a switch tube with better dynamic parameters can be selected in the first power conversion circuit, the power supply efficiency can be improved in a light-load state. The controller controls the first power conversion circuit to operate when the load demand voltage or load current is large. Since a switch tube with a smaller on-resistance can be selected in the first power conversion circuit, the conduction loss is reduced, and the output power can be increased in a heavy-load state, and the overall current output capacity and voltage output capacity are improved. In this way, the power supply can meet the needs of different scenarios and achieve both high power supply efficiency and large output power.

[0184] In a possible implementation manner, the controller is further used to connect one end of the fifth power conversion circuit, the other end of the fifth power conversion circuit is used 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; the controller may be specifically used to:

[0185] When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate;

[0186] 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 second power conversion circuit is controlled to operate, and the fourth current threshold is greater than the first current threshold;

[0187] 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, controlling the second power conversion circuit to operate;

[0188] When 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 operate.

[0189] In the embodiment of the present application, the controller controls the low-power phase to work alone, the high-power phase to work alone, or the two high-power phases to work together according to the load demand voltage and load current, so as to meet the load requirements for different load conditions, improve the power supply efficiency under light load conditions, provide greater output power under heavy load conditions, and improve the overall current output capacity and voltage output capacity, thereby meeting the needs of different scenarios and achieving both high efficiency and high power.

[0190] In addition, compared with adjusting the operation of the corresponding power conversion circuit according to the power size, the power 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, and the control 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 achieve protection for the first power conversion circuit and avoid damage to the devices in the first power conversion circuit. The control process is more detailed and the reliability is higher.

[0191] The present application also provides a display module, Fig.12 A schematic diagram of the structure of a display module provided in an embodiment of the present application. Fig.12 As shown, the display module may include Figure 1 , Figure 4-Figure 10 In any of the power management modules and display devices shown in the figure, in the display module, the input end of the power management module is used to connect to the power supply, the output end of the power management module is used to connect to the display device, and the power management module is used to convert the voltage provided by the power supply and output it to the display device. Since the power management module in the display module can improve the power efficiency under light load conditions and increase the output power under heavy load conditions, the display module can achieve both high power and high efficiency.

[0192] The present application also provides an electronic device, Fig.13 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Fig.13 As shown, the electronic device includes Figure 1 , Figure 4-Figure 10 Any power management module shown in the figure, such as Fig.11 The power chip shown or Fig.12 In the electronic device, since the power chip or the power management module can improve the power efficiency under light load conditions and improve the output power under heavy load conditions, the electronic device can achieve both high power and high efficiency.

[0193] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power management module, characterized in that: The invention comprises a power supply chip, a first power conversion circuit and a second power conversion circuit, wherein the power supply chip is used to connect 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 respectively 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 respectively used 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; The first power conversion circuit and the second power conversion circuit are used to convert the voltage output by the power supply; The controller is used to receive the load demand voltage of the load and obtain the load current, and control the operation of the first power conversion circuit or the second power conversion circuit 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 according to claim 1, characterized in that: The controller is specifically used for: When the load demand voltage is less than a voltage threshold and the load current is less than a first current threshold, controlling the first power conversion circuit to operate; When the load demand voltage is greater than or equal to the voltage threshold; or when the load current is greater than or equal to the first current threshold, the second power conversion circuit is controlled to operate.

3. The power management module according to claim 2, characterized in that: The first power conversion circuit and the second power conversion circuit both include a switching tube and an inductor. The inductors of the first power conversion circuit and the second power conversion circuit are both located outside the power chip. The switching tube in the first power conversion circuit is integrated in the power chip, and the switching tube in the second power conversion circuit is located outside the power chip.

4. The power management module according to claim 3, characterized in that: The power management module further includes a third power conversion circuit, 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 both located outside the power chip; and the controller is specifically used for: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; When the load demand voltage is greater than or equal to the voltage threshold, and the load current is less than a second current threshold, controlling the second power conversion circuit to operate; 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 second current threshold, controlling the second power conversion circuit to operate; When the load current is greater than or equal to the second current threshold, controlling the second power conversion circuit and the third power conversion circuit to operate; Wherein, the second current threshold is greater than the first current threshold.

5. The power management module according to claim 3, characterized in that: The power management module further includes a fourth power conversion circuit, wherein 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 chip, and the switch tube in the fourth power conversion circuit is integrated in the power chip; the controller is specifically used for: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; 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, controlling the first power conversion circuit and the fourth power conversion circuit to operate; When the load current is greater than or equal to the 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 demand voltage is greater than or equal to the voltage threshold, controlling the second power conversion circuit to operate; Wherein, the third current threshold is greater than the first current threshold.

6. The power management module according to claim 2, characterized in that: The first power conversion circuit and the second power conversion circuit both include a switch tube and an inductor, and the switch tube and the inductor in the first power conversion circuit and the second power conversion circuit are both located outside the power chip.

7. The power management module according to claim 6, characterized in that: The power management module further includes a fifth power conversion circuit, wherein 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 switch tube and the inductor in the fifth power conversion circuit are both located outside the power chip; and the controller is specifically used for: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; 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, controlling the second power conversion circuit to operate, and the fourth current threshold is greater than the first current threshold; 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 fourth current threshold, controlling the second power conversion circuit to operate; When 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 operate.

8. The power management module according to claim 2, characterized in that: The first power conversion circuit and the second power conversion circuit both include switching tubes and inductors. The inductors in the first power conversion circuit and the second power conversion circuit are both located outside the power chip, and the switching tubes in the first power conversion circuit and the second power conversion circuit are both integrated in the power chip.

9. The power management module according to claim 8, characterized in that: The power management module further includes a sixth power conversion circuit, wherein 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 chip, and the switch tube in the sixth power conversion circuit is also integrated in the power chip; the controller is specifically used for: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; When the load demand voltage is greater than or equal to the voltage threshold and the load current is less than a fifth current threshold, controlling the second power conversion circuit to operate, and the fifth current threshold is greater than the first current threshold; 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 fifth current threshold, controlling the second power conversion circuit to operate; When 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 operate.

10. The power management module according to any one of claims 2 to 9, characterized in that: The first current threshold is determined based on the maximum current carrying capacity of the switch tube in the first power conversion circuit, and the voltage threshold is determined based on the maximum voltage withstand capacity of the switch tube in the first power conversion circuit.

11. The power management module according to any one of claims 2 to 5, characterized in that: The on-resistance of the switch tube in the first power conversion circuit is greater than a first threshold, the on-resistance of the switch tube in the second power conversion circuit is less than a second threshold, and the second threshold is less than the first threshold.

12. The power management module according to any one of claims 1 to 11, characterized in that: The load includes a display device, and each of the power conversion circuits is used to provide a negative voltage power supply for the display device.

13. A display module, characterized in that: The display module includes a power management module and a display device as described in any one of claims 1 to 12, wherein the input end of the power management module is used to connect to a power source, the output end of the power management module is used to connect to the display device, and the power management module is used to convert the voltage provided by the power source and output it to the display device.

14. A power chip, characterized in that: The power chip includes a controller, the power chip is used to connect the power supply, the controller is used to connect one end of the first power conversion circuit and one end 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 to connect the load, and 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 to convert the voltage output by the power supply; The controller is used to receive the load demand voltage of the load and obtain the load current, and control the operation of the first power conversion circuit or the second power conversion circuit according to the load demand voltage and the load current, and the load current is the current received by the load.

15. The power chip according to claim 14, characterized in that: The controller is specifically used for: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; When 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 operate.

16. The power chip according to claim 15, characterized in that: The controller is also used to connect one end of a fifth power conversion circuit, the other end of the fifth power conversion circuit is used 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; the controller is specifically used to: When the load demand voltage is less than the voltage threshold and the load current is less than the first current threshold, controlling the first power conversion circuit to operate; 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, controlling the second power conversion circuit to operate, and the fourth current threshold is greater than the first current threshold; 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 fourth current threshold, controlling the second power conversion circuit to operate; When 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 operate.

17. An electronic device, characterized in that: The electronic device comprises the power management module as described in any one of claims 1-12, the display module as described in claim 13 or the power chip as described in any one of claims 14-16.

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