Power supply and control method thereof, display device

Abstract

The embodiment of the present application discloses a power supply, a control method thereof and a display device. The power supply comprises at least two power supply modules, at least two feedback adjustment modules and a first power supply processing module. The first power supply processing module can determine the reference current of the second power supply end of the power supply module. The control signal generated by the feedback adjustment module can adjust the actual current output by the second power supply end of the power supply module to be approximately equal to the reference current, thereby solving the problem of uneven output current of the parallel power supply modules. In addition, the temperature of the measurement point detected by the power supply module is incorporated into the control loop formed by the power supply module and the feedback adjustment module. The feedback adjustment module can adjust the output current of the power supply module according to the temperature of the measurement point, thereby avoiding the failure or damage of the power supply module caused by the temperature rise of the measurement point due to the excessive current, and further improving the reliability of the power supply.

Description

Technical Field

[0001] The present invention relates to the field of power supply technology, and in particular to a power supply and its control method, and a display device. Background Technology

[0002] Currently, medium-sized tablets or laptops using Active-Matrix Organic Light Emitting Diodes (AMOLEDs) require a relatively large power supply current, making existing electroluminescence integrated circuits (ELICs) unable to meet the power supply current requirements of these applications. Furthermore, using a single ELIC integrated power supply also presents problems such as increased temperature rise and lower reliability due to the large load current. Summary of the Invention

[0003] This invention provides a power supply and its control method, as well as a display device, to solve the problems of high power supply temperature and low reliability while meeting the application requirements of AMOLED medium-sized tablets or laptops.

[0004] According to one aspect of the present invention, a power supply is provided, comprising: at least two power modules, at least two feedback regulation modules, and a first power processing module;

[0005] The power module includes a control terminal and a second power terminal. The power module is used to output a second power from the second power terminal according to the control signal of the control terminal. At least one power module also includes a first power terminal, and the first power output from the first power terminal is supplied to the first output terminal of the power supply.

[0006] At least two power modules have their second power terminals connected to the second output terminal of the power supply.

[0007] The first power processing module is connected to the feedback adjustment module. The first power processing module is used to determine the reference current of the second power supply terminal of the power module.

[0008] The feedback adjustment module is connected to the power supply module in a one-to-one correspondence. The feedback adjustment module is used to output control signals to the control terminal of the power supply module based on the reference current of the second power supply terminal of the corresponding power supply module, the first voltage of the second output terminal, the temperature of the measurement point of the power supply module, and the current collected at the second power supply terminal.

[0009] Optionally, the power module also includes a temperature measurement terminal; the feedback adjustment module includes a first error processing unit, a second error processing unit, and a superposition processing unit.

[0010] The first terminal of the first error processing unit is connected to the first power processing module, the second terminal of the first error processing unit is connected to the second power supply terminal, and the third terminal of the first error processing unit is connected to the second output terminal; the first error processing unit is used to acquire the reference current, the first voltage, and the sampled current, and to obtain the voltage error signal based on the reference current, the first voltage, and the sampled current;

[0011] The first end of the second error processing unit is connected to the temperature measurement end. The second error processing unit is used to acquire the temperature of the measurement point and to obtain the temperature difference signal by subtracting the temperature of the measurement point from the temperature threshold.

[0012] The output terminals of both the first and second error processing units are connected to the superposition processing unit, which is used to superimpose the voltage error signal and the temperature difference signal to output a control signal.

[0013] Optionally, the first error processing unit includes a current error processing subunit, a superposition subunit, and a voltage error processing subunit;

[0014] The first end of the current error processing subunit serves as the first end of the first error processing unit, and the second end of the current error processing subunit serves as the second end of the first error processing unit. The current error processing subunit is used to obtain the current error signal by subtracting the reference current and the acquired current.

[0015] The first input terminal of the superposition subunit is connected to the output terminal of the current error processing subunit. The superposition subunit is used to superimpose the current error signal with the reference voltage.

[0016] The output terminal of the superposition subunit is connected to the first terminal of the voltage error processing subunit. The second terminal of the voltage error processing subunit serves as the third terminal of the first error processing unit. The output terminal of the voltage error processing subunit serves as the output terminal of the first error processing unit. The voltage error processing subunit is used to obtain the voltage error signal by subtracting the signal superimposed on the first voltage and the current error signal and the reference voltage.

[0017] Optionally, the current error processing subunit includes a first amplifier, the superposition subunit includes a first adder, and the voltage error processing subunit includes a second amplifier.

[0018] The first input terminal of the first amplifier serves as the first terminal of the current error processing subunit, the second input terminal of the first amplifier serves as the second terminal of the current error processing subunit, and the output terminal of the first amplifier serves as the output terminal of the current error processing subunit.

[0019] The first input terminal of the first adder serves as the first input terminal of the superposition subunit, the second input terminal of the first adder receives the reference voltage, and the output terminal of the first adder serves as the output terminal of the superposition subunit.

[0020] The first input terminal of the second amplifier serves as the first terminal of the voltage error processing subunit, the second input terminal of the second amplifier serves as the second terminal of the voltage error processing subunit, and the output terminal of the second amplifier serves as the output terminal of the voltage error processing subunit.

[0021] Optionally, the second error processing unit includes a third amplifier, and the superposition processing unit includes a second adder;

[0022] The first input terminal of the third amplifier serves as the first terminal of the second error processing unit, the second input terminal of the third amplifier receives the temperature threshold, and the output terminal of the third amplifier serves as the output terminal of the second error processing unit.

[0023] The first input terminal of the second adder is connected to the output terminal of the first error processing unit, the second input terminal of the second adder is connected to the output terminal of the third amplifier, and the output terminal of the second adder is connected to the control terminal.

[0024] Optionally, the first output terminal is connected to the feedback adjustment module through the first power processing module. The first power processing module is used to determine the reference current of the second power terminal of the power module based on the current of the first output terminal and the number of power modules.

[0025] Optionally, the voltage polarities of the first and second power supplies are different;

[0026] Optionally, the power modules communicate with each other via wired communication, and the power modules include electroluminescent chips;

[0027] The electroluminescent chip includes a first pin, a second pin, a third pin, and a fourth pin. The first pin serves as the control terminal, the second pin serves as the first power supply terminal, the third pin serves as the second power supply terminal, and the fourth pin serves as the temperature measurement terminal.

[0028] Optionally, the first power processing module includes a divider;

[0029] The first input terminal of the divider is connected to the first output terminal, and the output terminal of the divider is connected to the first terminal of the first error processing unit.

[0030] According to another aspect of the present invention, a power supply control method is provided, wherein the power supply includes at least two power supply modules; each power supply module includes a control terminal and a second power supply terminal, and at least one power supply module further includes a first power supply terminal, wherein a first power supply output from the first power supply terminal is supplied to a first output terminal of the power supply; the second power supply terminals of the at least two power supply modules are connected to a second output terminal of the power supply; the power supply control method includes:

[0031] Obtain the load current;

[0032] The number of startup power modules is determined based on the load current.

[0033] When the number of startup power modules is greater than or equal to 2, a current shunting control strategy is adopted;

[0034] The current shunt control strategy includes: determining the reference current of the second power supply terminal of the power supply module to be started based on the load current and the number of power supply modules to be started;

[0035] Based on the reference current of the second power supply terminal of the corresponding power module, the first voltage of the second output terminal, the temperature of the measurement point of the power module, and the current collected by the second power supply terminal, a control signal is output to the control terminal of the power module.

[0036] The second power supply is output from the second power supply terminal according to the control signal from the control terminal of the power supply module.

[0037] Optionally, determining the number of startup power modules based on the load current includes:

[0038] If the load current is greater than the threshold current, the number of power supply modules to be started is greater than or equal to 2.

[0039] If the load current is less than or equal to the threshold current, the number of power supply modules to start is 1.

[0040] Optionally, the current at the first output terminal and / or the second output terminal can be collected as the load current;

[0041] Optionally, based on the reference current at the second power supply terminal of the corresponding power module, the first voltage at the second output terminal, the temperature at the measurement point of the power module, and the current collected at the second power supply terminal, a control signal is determined to be output to the control terminal of the power module, including:

[0042] The current error signal is obtained by subtracting the reference current and the sampled current at the second power supply terminal.

[0043] The current error signal is superimposed on the reference voltage;

[0044] The voltage error signal is obtained by subtracting the first voltage and current error signals from the signal superimposed on the reference voltage.

[0045] The temperature at the measurement point is obtained, and the temperature difference signal is obtained by subtracting the temperature at the measurement point from the temperature threshold.

[0046] The voltage error signal and temperature difference signal are superimposed to output the control signal.

[0047] According to another aspect of the present invention, a display device is provided, which includes a power supply according to any embodiment of the present invention.

[0048] As described above, the power supply of the display device disclosed in this embodiment of the invention comprises at least two power modules, at least two feedback adjustment modules, and a first power processing module. The total amount of electrical energy supplied to the display device by the power supply is fixed. When a single power module cannot meet the power output demand, the at least two power modules can evenly distribute the total power required to be output by the power supply to each activated power module, thereby reducing the pressure on the power output of each activated power module. Based on the connection relationships between the modules, the first power processing module can equally divide the current of the first power supply, where the current of the first power supply can be equal to the current of the second power supply. In other words, the first power processing module can equally divide the total output current of at least two power supply modules connected in parallel with their second power supply terminals, obtaining the reference current that each power supply module's second power supply terminal should output. The feedback adjustment module then generates a control signal based on the reference current of the corresponding power supply module's second power supply terminal, the first voltage of the second output terminal, the measurement point temperature of the power supply module, and the collected current at the second power supply terminal. This signal ensures that the actual current generated by the power supply module is approximately equal to the reference current, thus making the actual output current of each power supply module approximately equal. This solves the problem of uneven output current from parallel power supply modules, addressing the issues of increased power supply temperature and low reliability caused by uneven output current from different power supply modules. Furthermore, the measurement point temperature detected by the power supply module is incorporated into the control loop formed by the power supply module and the feedback adjustment module. Therefore, the feedback adjustment module can adjust the output current of the power supply module based on the detected measurement point temperature, indirectly adjusting the measured measurement point temperature to prevent power supply module failure or damage due to abnormal measurement point temperature, thereby further improving power supply reliability.

[0049] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 A schematic diagram of a power supply structure provided in an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0055] Figure 5 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0056] Figure 6 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0057] Figure 7 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0058] Figure 8 A schematic diagram of a power supply structure provided in an embodiment of the present invention;

[0059] Figure 9 This is a schematic diagram of another power supply structure provided in an embodiment of the present invention;

[0060] Figure 10 A schematic flowchart of a power control method provided in an embodiment of the present invention;

[0061] Figure 11 This is a flowchart illustrating a method for determining the control signal output to the control terminal of a power module based on the reference current of the second power terminal of the corresponding power module, the first voltage of the second output terminal, the temperature of the measurement point of the power module, and the acquisition current of the second power terminal, as provided in an embodiment of the present invention.

[0062] Figure 12 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0063] Figure 13 This is a schematic diagram of the structure of a display device powering a pixel, provided in an embodiment of the present invention. Detailed Implementation

[0064] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] This invention provides a power supply. Figure 1 This is a schematic diagram of a power supply provided in an embodiment of the present invention. Figure 1 As shown, the power supply includes: at least two power modules 110, at least two feedback regulation modules 120, and a first power processing module 130;

[0067] Power module 110 includes a control terminal C and a second power terminal A2. Power module 110 is used to output a second power supply from the second power terminal A2 according to the control signal of control terminal C. At least one power module 110 also includes a first power terminal A1, and the first power supply output from the first power terminal A1 is supplied to the first output terminal OUT1 of the power supply. The second power terminals A2 of at least two power modules 110 are connected to the second output terminal OUT2 of the power supply. A first power processing module 130 is connected to a feedback adjustment module 120. The first power processing module 130 is used to determine the reference current Iref of the second power terminal A2 of power module 110. The feedback adjustment module 120 is connected to power modules 110 in a one-to-one correspondence. The feedback adjustment module 120 is used to output a control signal to the control terminal C of power module 110 according to the reference current Iref of the second power terminal A2 of the corresponding power module 110, the first voltage V_ELVSS of the second output terminal OUT2, the temperature of the measurement point of power module 110, and the sampling current I_ELVSS of the second power terminal A2.

[0068] Each power module 110 has the same or similar structure and serves as the power source for the display device, providing appropriate power to ensure its normal operation. Each power module 110 includes a control terminal C and a second power terminal A2. Each feedback adjustment module 120 is the same or similar, acting as the monitoring and adjustment component of the power module 110. It dynamically adjusts the control signals output to the power module 110 based on its real-time output and status, thereby indirectly regulating the power output of the power module 110. The total power supplied to the display device by a single power module 110 is fixed. When a single power module 110 cannot meet the power output demand, at least two power modules 110 are connected in parallel via their second power terminals A2. This allows the total power required to be output to be evenly distributed among each activated power module 110, reducing the power output pressure on each activated power module 110. To evenly distribute the total electrical energy required by the power supply to each activated power module 110, the power modules 110 need to be connected in parallel, that is, at least two power modules 110 are connected to their second power terminals A2. Connecting the second power terminals A2 of the power modules 110 allows the generated electrical energy to be channeled to the same output terminal (second output terminal OUT2) of the power supply for output to the display device. The magnitude of the first power supply current output from the first output terminal OUT1 is the same as the magnitude of the second power supply current output from the second output terminal OUT2. The magnitude of the second power supply current is the sum of the actual currents output from the second power terminals A2 of all power modules 110. The first power processing module 130 can acquire the current from the first output terminal OUT1 through a current acquisition unit, or the first power processing module 130 may have the function of acquiring the current from the first output terminal OUT1, obtain the load current, perform equal distribution processing, obtain the current that should be output from the second power terminal A2 of each power module 110, and use the reference current Iref as the reference for each feedback adjustment module 120 to measure the acquired current I_ELVSS of the second power terminal A2 of the power module 110. Optionally, the reference current Iref of the second power supply terminal A2 of at least two power supply modules 110 can be the same or different, and their proportional relationship can be set as needed.

[0069] Specifically, the power module 110 also includes a temperature measurement terminal A3. The first output terminal OUT1 is connected to the first terminal of each feedback adjustment module 120 via the first power processing module 130. The feedback adjustment module 120 can obtain the reference current Iref calculated by the first power processing module 130 based on the load current and the number of power modules. The second terminal of each feedback adjustment module 120 is connected to the second power terminal A2 of its corresponding power module 110. Each feedback adjustment module 120 can obtain the sampled current I_ELVSS of the second power terminal A2 of its corresponding power module 110, which is approximately equal to the actual current of the second power terminal A2 of the source module 110. The third terminal of each feedback adjustment module 120 is connected to the second output terminal OUT2. Each feedback adjustment module 120 can obtain the first voltage V_ELVSS of the second power supply output by the second output terminal OUT2. The fourth terminal of each feedback adjustment module 120 is connected to the temperature measurement terminal A3 of its corresponding power module 110. Each feedback adjustment module 120 can obtain the temperature of the measurement point output by the temperature measurement terminal A3 of its corresponding power module 110. The measured temperature refers to the maximum temperature of the measured point detected by the power module 110 (e.g., the power module 110 as a whole, its internal inductors, transistors, etc.). After the feedback adjustment module 120 obtains the reference current Iref, the first voltage V_ELVSS, the measured temperature, and the sampled current I_ELVSS of the second power supply terminal, it can generate a control signal based on these parameters. The output terminal of the feedback adjustment module 120 is connected to the control terminal C of the corresponding power module 110, and can output a control signal, which can be a pulse width modulation (PWM) signal, to the control terminal C of the power module 110. The power module 110 adjusts the output current of its second power supply terminal A2 according to the control signal.

[0070] As can be seen from the above connection relationship, each feedback adjustment module 120 uses the reference current Iref that should be output from the second power supply terminal A2 of each power supply module 110 as the reference for each feedback adjustment module 120 to measure the actual current output by the power supply module 110. Thus, the control signal generated by the feedback adjustment module 120 can make the actual current generated by the power supply module 110 approximately equal to the reference current Iref, that is, make the actual current output by each power supply module 110 approximately equal, thereby solving the problem of uneven output current of the power supply modules 110 in parallel, and solving the problem of high power supply temperature and low reliability caused by uneven output current of different power supply modules 110.

[0071] In addition, the temperature of the measurement point detected by the power supply module 110 is incorporated into the control loop formed by the power supply module 110 and the feedback adjustment module 120. Thus, the feedback adjustment module 120 can adjust the output current of the power supply module 110 according to the temperature of the measurement point detected by the power supply module 110, thereby indirectly adjusting the temperature of the measurement point detected by the power supply module 110. This is to prevent the power supply module 110 from failing or being damaged due to abnormal temperature of the measurement point, thereby further improving the reliability of the power supply.

[0072] Optionally, one power module 110 includes a first power terminal A1, while the other power modules 110 do not include a first power terminal A1. When the voltage energy of this polarity provided by the first power terminal A1 of one power module 110 is sufficient for use, it is not necessary to connect the first power terminals A1 of multiple power modules 110 in parallel.

[0073] Optionally, multiple power modules 110 include a first power terminal A1. When the voltage energy of the polarity provided by the first power terminal A1 of one power module 110 is sufficient for use, it is not necessary to connect the first power terminals A1 of multiple power modules 110 in parallel. When the voltage energy of the polarity provided by the first power terminal A1 of one power module 110 is insufficient for use, it is necessary to connect the first power terminals A1 of multiple power modules 110 in parallel.

[0074] Optionally, the feedback regulation module 120 can be implemented in software and / or hardware. Optionally, the first power processing module 130 can be implemented in software and / or hardware.

[0075] Figure 2 A schematic diagram of another power supply structure provided in an embodiment of the present invention is shown below. Figure 2 As shown, the power supply also includes a superposition module 140. The superposition module 140 is connected to the second power supply terminal A2 of at least two power supply modules 110, and the superposition module 140 is used to superimpose the second power outputs from at least two second power supply terminals A2 and supply them to the second output terminal OUT2 of the power supply.

[0076] Among them, the power module 110 can be connected in parallel through the superposition module 140, and the power of at least two power modules 110 connected to the superposition module 140 can be merged into the same output terminal (second output terminal OUT2) of the power supply to output the power to the display device, thereby increasing the power that the power supply can provide.

[0077] Figure 3 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 3 As shown, the power module 110 also includes a temperature measurement terminal A3; the feedback adjustment module 120 includes a first error processing unit 121, a second error processing unit 122, and a superposition processing unit 123.

[0078] The first error processing unit 121 is used to acquire the reference current Iref, the first voltage V_ELVSS, and the sampling current I_ELVSS of the second power supply terminal A2, and to obtain a voltage error signal based on the reference current Iref, the first voltage V_ELVSS, and the sampling current I_ELVSS of the second power supply terminal A2; the second error processing unit 122 is used to acquire the temperature of the measurement point, and to obtain a temperature difference signal by subtracting the temperature of the measurement point from the temperature threshold; the superposition processing unit 123 is used to superimpose the voltage error signal and the temperature difference signal to output a control signal.

[0079] Optionally, at least one of the first error processing unit 121, the second error processing unit 122, and the superposition processing unit 123 may be implemented by software and / or hardware.

[0080] Optionally, the first end of the first error processing unit 121 is connected to the first power processing module 130, the second end of the first error processing unit 121 is connected to the second power supply terminal A2, and the third end of the first error processing unit 121 is connected to the second output terminal OUT2; the first end of the second error processing unit 122 is connected to the temperature measurement terminal A3, and the output terminals of both the first error processing unit 121 and the second error processing unit 122 are connected to the superposition processing unit 123.

[0081] Specifically, according to the above connection relationship, the first terminal of the first error processing unit 121 is connected to the first power processing module 130. The first power processing module 130 can output the reference current Iref of the second power supply terminal A2, which it calculates based on the load current, to the first error processing unit 121, so that the first error processing unit 121 can obtain the reference current Iref of the second power supply terminal A2. The second terminal of the first error processing unit 121 is connected to the second power supply terminal A2. The first error processing unit 121 can obtain the sampled current I_ELVSS of the second power supply terminal A2 of the power module. This can be obtained by acquiring the current output from the second power supply terminal A2 through a current acquisition unit, etc. The first error processing unit 121 can have the function of current acquisition. The third terminal of the first error processing unit 121 is connected to the second output terminal OUT2. The first error processing unit can obtain the first voltage V_ELVSS of the second power supply output from the second output terminal OUT2. The first error processing unit 121 can perform error processing on the reference current Iref, the first voltage V_ELVSS, and the sampled current I_ELVSS of the second power supply terminal A2. For example, it can subtract the sampled current I_ELVSS from the reference current Iref, perform proportional calculation (differential amplification), and add the first voltage V_ELVSS to obtain a voltage error signal. Thus, the first error processing unit 121 can determine the voltage deviation output by the power module 110 through the above process. The first terminal of the second error processing unit 122 is connected to the temperature measurement terminal A3, and the second error processing unit 122 can obtain the temperature of the measurement point output by the temperature measurement terminal A3. The second error processing unit can perform error processing on the measurement point temperature, that is, subtract the measurement point temperature from the temperature threshold Tref. For example, it can subtract the measurement point temperature from the temperature threshold Tref, perform proportional calculation (differential amplification), and obtain a temperature difference signal. Thus, the second error processing unit 122 can determine the temperature rise deviation of the power module 110 through the above process. The output terminals of both the first error processing unit 121 and the second error processing unit 122 are connected to the superposition processing unit 123. The superposition unit can obtain the voltage error signal and the temperature difference signal, and perform superposition processing on the voltage error signal and the temperature difference signal to generate a control signal. The power supply module 110 can adjust its output current according to the control signal to control the current flowing through the measurement point detected by the power supply module 110, thereby indirectly controlling the temperature of the measurement point detected by the power supply module 110. Furthermore, the power supply module 110 can adjust its output current to be approximately equal to the reference current Iref input by the feedback adjustment module 120 according to the control signal, realizing closed-loop adjustment of the output current of the power supply module 110.

[0082] Figure 4 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 4As shown, the first error processing unit 121 includes a current error processing subunit 1211, a superposition subunit 1212, and a voltage error processing subunit 1213.

[0083] The current error processing subunit 1211 is used to obtain a current error signal by subtracting the reference current Iref and the acquired current I_ELVSS; the superposition subunit 1212 is used to superimpose the current error signal with the reference voltage Vref; the voltage error processing subunit 1213 is used to obtain a voltage error signal by subtracting the first voltage V_ELVSS and the superimposed signal of the current error signal and the reference voltage Vref. The reference voltage Vref is the voltage that the second power supply should output at the second output terminal OUT2.

[0084] Optionally, at least one of the current error processing subunit 1211, the superposition subunit 1212, and the voltage error processing subunit 1213 can be implemented by software and / or hardware.

[0085] The first end of the current error processing subunit 1211 serves as the first end of the first error processing unit 121, and the second end of the current error processing subunit 1211 serves as the second end of the first error processing unit 121. The first input end of the superposition subunit 1212 is connected to the output end of the current error processing subunit 1211, and the output end of the superposition subunit 1212 is connected to the first end of the voltage error processing subunit 1213. The second end of the voltage error processing subunit 1213 serves as the third end of the first error processing unit 121, and the output end of the voltage error processing subunit 1213 serves as the output end of the first error processing unit 121.

[0086] Specifically, the first terminal of the current error processing subunit 1211 is connected to the first power processing module 130, and the current error processing subunit 1211 can acquire the reference current Iref output by the first power processing module 130. The second terminal of the current error processing subunit 1211 is connected to the second power supply terminal A2, and the current error processing subunit 1211 can acquire the sampling current I_ELVSS of the second power supply terminal A2. The current error processing subunit 1211 calculates the difference between the reference current Iref and the sampling current I_ELVSS, for example, the difference between the reference current Iref and the sampling current I_ELVSS. After proportional calculation, i.e., differential amplification processing, the current error signal can be obtained, thereby knowing the current deviation output by the power supply module 110. The first input terminal of the superposition subunit 1212 is connected to the output terminal of the current error processing subunit 1211. The superposition subunit 1212 can acquire the current error signal output by the current error processing subunit 1211, and the superposition subunit 1212 can superimpose the current error signal with the reference voltage Vref. The output terminal of the superposition subunit 1212 is connected to the first terminal of the voltage error processing subunit 1213. The voltage error processing subunit 1213 can acquire the signal superimposed on the current error signal and the reference voltage Vref. The second terminal of the voltage error processing subunit 1213 is connected to the second output terminal OUT2. The voltage error processing subunit 1213 can acquire the first voltage V_ELVSS output from the second power supply terminal A2 of the power module 110. The voltage error processing subunit 1213 can subtract the first voltage V_ELVSS from the signal superimposed on the current error signal and the reference voltage Vref. For example, it can subtract the difference between the first voltage V_ELVSS and the signal superimposed on the current error signal and the reference voltage Vref. After proportional calculation, i.e., differential amplification processing, the voltage error signal is obtained, thereby determining the voltage deviation output by the power module 110.

[0087] Figure 5 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 5 As shown, the current error processing subunit 1211 includes a first amplifier T1, the superposition subunit 1212 includes a first adder K1, and the voltage error processing subunit 1213 includes a second amplifier T2.

[0088] The first input terminal of the first amplifier T1 serves as the first terminal of the current error processing subunit 1211, the second input terminal of the first amplifier T1 serves as the second terminal of the current error processing subunit 1211, and the output terminal of the first amplifier T1 serves as the output terminal of the current error processing subunit 1211; the first input terminal of the first adder K1 serves as the first input terminal of the superposition subunit 1212, the second input terminal of the first adder K1 receives the reference voltage Vref, and the output terminal of the first adder K1 serves as the output terminal of the superposition subunit 1212; the first input terminal of the second amplifier T2 serves as the first terminal of the voltage error processing subunit 1213, the second input terminal of the second amplifier T2 serves as the second terminal of the voltage error processing subunit 1213, and the output terminal of the second amplifier T2 serves as the output terminal of the voltage error processing subunit 1213.

[0089] Specifically, the first input terminal of the first amplifier T1 is connected to the first power processing module 130, and the first amplifier T1 can acquire the reference current Iref of the first power processing module 130. The second input terminal of the first amplifier T1 is connected to the second power supply terminal A2, and the first amplifier T1 can acquire the sampling current I_ELVSS of the second power supply terminal A2. The first amplifier T1 calculates the difference between the reference current Iref and the sampling current I_ELVSS to obtain a current error signal, thereby determining the current deviation output by the power supply module 110. The first input terminal of the first adder K1 is connected to the output terminal of the current error processing subunit 1211, and the first adder K1 can acquire the current error signal output by the current error processing subunit 1211. The second input terminal of the first adder K1 receives the reference voltage Vref, and the first adder K1 can superimpose the current error signal with the reference voltage Vref. The output terminal of the first adder K1 is connected to the first terminal of the second amplifier T2, and the second amplifier T2 can acquire the signal superimposed on the current error signal and the reference voltage Vref. The second input terminal of the second amplifier T2 is connected to the second output terminal OUT2. The second amplifier T2 can obtain the first voltage V_ELVSS. The second amplifier T2 can obtain the voltage error signal by subtracting the signal superimposed on the first voltage V_ELVSS and the current error signal and the reference voltage Vref, thereby knowing the voltage deviation output by the power supply module 110.

[0090] Figure 6 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 6 As shown, the second error processing unit 122 includes a third amplifier T3, and the superposition processing unit 123 includes a second adder K.

[0091] The first input terminal of the third amplifier T3 serves as the first terminal of the second error processing unit 122. The second input terminal of the third amplifier T3 receives the temperature threshold Tref. The output terminal of the third amplifier T3 serves as the output terminal of the second error processing unit 122. The first input terminal of the second adder K2 is connected to the output terminal of the first error processing unit 121. The second input terminal of the second adder K2 is connected to the output terminal of the third amplifier T3. The output terminal of the second adder K2 is connected to the control terminal C.

[0092] Specifically, the first input terminal of the third amplifier T3 is connected to the temperature measurement terminal A3. The third amplifier T3 can acquire the temperature of the measurement point detected by the power module 110. The second input terminal of the third amplifier T3 receives the temperature threshold Tref. The third amplifier T3 can obtain the temperature difference signal by subtracting the measurement point temperature from the temperature threshold Tref, thereby determining the temperature rise deviation of the power module 110. The first input terminal of the second adder K2 is connected to the output terminal of the second amplifier T2. The second adder K2 can acquire the voltage error signal output by the second amplifier T2. The second input terminal of the second adder K2 is connected to the output terminal of the third amplifier T3. The second adder K2 can acquire the temperature difference signal. The second adder K2 can superimpose the voltage error signal and the temperature difference signal to generate a control signal, and output the control signal to the control terminal C of the power module 110.

[0093] Figure 7 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 7 As shown, the first output terminal OUT1 is connected to the feedback adjustment module 120 through the first power processing module 130. The first power processing module 130 is used to determine the reference current Iref of the second power terminal A2 of the power module 110 based on the current of the first output terminal OUT1 and the number of power modules 110.

[0094] The reference current Iref is equal to the current at the first output terminal OUT1 divided by the number of power supply modules 110.

[0095] Furthermore, the first and second power supplies have different voltage polarities. Optionally, one of the first and second power supplies is a positive voltage, and the other is a negative voltage. For example, the first power supply is +5V and the second power supply is -5V.

[0096] Optionally, the power modules 110 communicate with each other via wired communication. Optionally, the power module 110 includes an electroluminescent chip;

[0097] The electroluminescent chip includes a first pin 1, a second pin 2, a third pin 3, and a fourth pin 4. The first pin 1 serves as the control terminal C, the second pin 2 serves as the first power supply terminal A1, the third pin 3 serves as the second power supply terminal A2, and the fourth pin 4 serves as the temperature measurement terminal A3.

[0098] The power modules 110 communicate with each other via wired communication, including IIC communication. The power module 110 can determine the number of power modules 110 that need to be activated based on the current required by the display device. If the number of power modules 110 that need to be activated is greater than two, the power modules 110 will activate the corresponding number of power modules 110 via wired communication (e.g., IIC communication). This allows the power modules 110 to rationally utilize power resources according to the specific load conditions, reduce unnecessary switching losses, and improve power efficiency.

[0099] Furthermore, the first power output from power module 110 is not supplied to the first power terminal A1 of the first output terminal OUT1 of the power supply, which is grounded. All power modules 110 are connected to the external power input line Vin, enabling them to obtain external input power and convert it into a first power supply and a second power supply capable of supporting the normal operation of the display device. The reset terminals of adjacent power chips are connected, so that when any power module 110 of the power supply is reset, all power modules 110 within the power supply will be reset simultaneously.

[0100] Specifically, such as Figure 7 As shown, pin 1 of the electroluminescent chip is connected to the output of the second adder K2, and pin 1 can receive the control signal output by the second adder K2. The first power supply output by the electroluminescent chip is not supplied to pin 2 of the first power output terminal OUT1, which is grounded. The first power supply output by the electroluminescent chip is supplied to pin 2 of the first power output terminal OUT1, which is connected to the first power processing module 130. The first power processing module 130 can acquire the first power supply output from pin 2. Pin 3 of the electroluminescent chip is connected to the superposition module 130 and the first amplifier T1. The superposition module 130 can acquire the voltage of the second power supply output from pin 3, and the first amplifier T1 can acquire the current of the second power supply output from pin 3 (equivalent to the sampling current I_ELVSS). Pin 4 of the electroluminescent chip is connected to the third amplifier T3, which can acquire the temperature of the measurement point output from pin 4.

[0101] Figure 8 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 8 As shown, the first power processing module 130 includes a divider P;

[0102] The first input terminal of the divider P is connected to the first output terminal OUT1, and the output terminal of the divider P is connected to the first terminal of the first error processing unit 121.

[0103] Specifically, the first input terminal of the divider P is connected to the first output terminal OUT1, which can obtain the first power supply output by the first output terminal OUT1. The second input terminal of the flip-flop is input with coefficient 1 / n (n is the number of power supply modules 110). The divider P can divide the current of the first power supply equally to obtain the reference current Iref that should be output by the second power supply terminal A2 of each power supply module 110, and transmit the reference current Iref to the first amplifier T1 as a reference.

[0104] Figure 9 A schematic diagram of another power supply structure provided in an embodiment of the present invention. For example... Figure 9 As shown, the superposition module 140 includes a third adder K3. The input terminal of the third adder K3 is connected to the second power supply terminal A2, and the output terminal of the third adder K3 serves as the second output terminal OUT2.

[0105] The input terminal of the third adder K3 is connected to the second power supply terminal A2, and the output terminal of the third adder K3 serves as the second output terminal OUT2. The third adder K3 can superimpose the second power supply output from the second power supply terminal A2 and supply it to the second output terminal OUT2 of the power supply.

[0106] Figure 10 This is a flowchart illustrating a power control method provided in an embodiment of the present invention, as shown below. Figure 10 As shown, this method is applied to a power supply provided in any embodiment of the present invention. The power supply includes at least two power modules; each power module includes a control terminal and a second power terminal, and at least one power module further includes a first power terminal, the first power output from the first power terminal being supplied to the first output terminal of the power supply; the second power terminals of the at least two power modules are connected to the second output terminal of the power supply.

[0107] Specifically, the power control method includes:

[0108] S11, Obtain the load current.

[0109] Specifically, load current refers to the current required by the load included in the display device when it is working normally. The power module can obtain the load current through the specific conditions of the load so as to make reasonable use of power resources in the future, that is, to make reasonable use of the power module included in the power supply.

[0110] S12. Determine the number of startup power supply modules based on the load current.

[0111] For example, if the load current is less than the threshold current of the power module, only a single power module that can output the first power supply to the power supply can be turned on; if the load current is greater than the threshold current of the power module, the number of power modules turned on is greater than or equal to the ratio of the load current to the threshold current (wherein, the number of power modules is a positive integer, and the power modules turned on include those that can output the first power supply to the power supply).

[0112] S13. When the number of startup power modules is greater than or equal to 2, a current shunting control strategy is adopted.

[0113] The current shunting control strategy refers to making the power modules that are started work in parallel, and the current output by each power module is approximately equal.

[0114] S14. The current shunt control strategy includes: determining the reference current of the second power supply terminal of the power supply module to be started based on the load current and the number of power supply modules to be started.

[0115] The feedback regulation module adopts a current shunt control strategy to determine that the reference current Iref at the second power supply terminal of the power supply module to be started is equal to the load current divided by the number of power supply modules to be started.

[0116] S15. Based on the reference current Iref of the second power supply terminal of the corresponding power supply module, the first voltage V_ELVSS of the second output terminal, the temperature of the measurement point of the power supply module, and the acquisition current of the second power supply terminal, output a control signal to the control terminal of the power supply module.

[0117] S16. Output the second power supply from the second power supply terminal according to the control signal from the control terminal of the power supply module.

[0118] Specifically, the first output terminal is connected to the first terminal of each feedback adjustment module via the first power processing module. The feedback adjustment module can obtain the reference current Iref calculated by the first power processing module through the current collected from the first output terminal. The second terminal of each feedback adjustment module is connected to the second power supply terminal of its corresponding power module. Each feedback adjustment module can obtain the collected current output from the second power supply terminal of its corresponding power module. The third terminal of each feedback adjustment module is connected to the second output terminal. Each feedback adjustment module can obtain the first voltage V_ELVSS of the second power supply output from the second output terminal. The fourth terminal of each feedback adjustment module is connected to the temperature measurement terminal of its corresponding power module. Each feedback adjustment module can obtain the measurement point temperature output from the temperature measurement terminal of its corresponding power module. The measurement point temperature refers to the maximum temperature of the measurement point detected by the power module. After the feedback adjustment module obtains the reference current Iref, the first voltage V_ELVSS, the measurement point temperature, and the collected current, it can generate a control signal based on these parameters. The output terminal of the feedback adjustment module is connected to the control terminal of its corresponding power module and can output a control signal to the control terminal of the power module. The power module adjusts the output current of its first and second power terminals according to the control signal.

[0119] As can be seen from the above connection relationship, each feedback adjustment module uses the reference current Iref that should be output from the second power supply terminal of each power module as the reference for each feedback adjustment module to measure the current collected by the power module output. Thus, the control signal generated by the feedback adjustment module can make the actual current generated by the power module approximately equal to the reference current Iref, that is, make the actual current output by each power module approximately equal, thereby solving the problem of uneven output current of power modules connected in parallel, and solving the problem of high power supply temperature and low reliability caused by uneven output current of different power modules.

[0120] In addition, the temperature of the measurement point detected by the power module is incorporated into the control loop formed by the power module and the feedback regulation module. Thus, the feedback regulation module can adjust the output current of the power module according to the temperature of the measurement point detected by the power module, thereby indirectly regulating the temperature of the measurement point detected by the power module. This is to prevent the power module from failing or being damaged due to abnormal temperature of the measurement point, thereby further improving the reliability of the power supply.

[0121] It should be noted that power modules currently communicate via wired communication methods, such as connecting power modules through an IIC signal line, enabling communication between power modules via IIC. If a power module receives a power-down command via IIC, all started power modules will exit the working state; if a power module does not receive a power-down command via IIC, steps S11-S16 will be executed repeatedly.

[0122] Optionally, determining the number of startup power supply modules based on the load current includes:

[0123] If the load current is greater than the threshold current, the number of power supply modules to be started is greater than or equal to 2.

[0124] If the load current is less than or equal to the threshold current, the number of power supply modules to start is 1.

[0125] The threshold current is the maximum current that a single power module can provide. When the load current exceeds the threshold current, it means that a single power module cannot meet the load's current requirements, and at least two power modules need to be activated to provide current to the load and ensure its normal operation. When the load current is less than or equal to the threshold current, it means that a single power module can meet the load's current requirements, and activating only one power module is sufficient to ensure the load's normal operation.

[0126] The above-mentioned method of increasing the number of power modules allows the power modules to make reasonable use of power resources according to the specific load conditions, reduce unnecessary switching losses, and improve the efficiency of power supply operation.

[0127] Optionally, the current at the first output terminal and / or the second output terminal can be collected as the load current.

[0128] The current at the first output terminal and the second output terminal are the same, therefore both the current at the first output terminal and the second output terminal are load currents.

[0129] Optionally, based on the technology of the above embodiments, Figure 11 A flowchart illustrating a method for determining the control signal output to the control terminal of a power module based on the reference current Iref at the second power supply terminal of the corresponding power module, the first voltage V_ELVSS at the second output terminal, the temperature at the measurement point of the power module, and the current collected at the second power supply terminal, is provided as an embodiment of the present invention. Figure 11 As shown, the method includes: S20, subtracting the reference current Iref at the second power supply terminal from the acquired current to obtain a current error signal.

[0130] Specifically, the first terminal of the current error processing subunit is connected to the first power supply processing module, and the current error processing subunit can acquire the reference current Iref output by the first power supply processing module. The second terminal of the current error processing subunit is connected to the second power supply terminal, and the current error processing subunit can acquire the sampled current of the second power supply terminal. The current error processing subunit calculates the difference between the reference current Iref and the sampled current to obtain the current error signal, thereby determining the current deviation output by the power supply module.

[0131] S21. Superimpose the current error signal with the reference voltage.

[0132] Specifically, the superposition subunit can acquire the current error signal output by the current error processing subunit, and the superposition subunit can superimpose the current error signal with the reference voltage Vref.

[0133] S22. The voltage error signal is obtained by subtracting the first voltage and current error signals from the signal superimposed on the reference voltage.

[0134] Specifically, the output terminal of the superposition subunit is connected to the first terminal of the voltage error processing subunit, which can acquire the signal superimposed on the current error signal and the reference voltage Vref. The second terminal of the voltage error processing subunit is connected to the second output terminal, which can acquire the first voltage V_ELVSS. The voltage error processing subunit can subtract the first voltage V_ELVSS from the signal superimposed on the current error signal and the reference voltage Vref to obtain the voltage error signal, thereby determining the voltage deviation output by the power module.

[0135] S23. Obtain the temperature at the measurement point and calculate the difference between the temperature at the measurement point and the temperature threshold to obtain the temperature difference signal.

[0136] Specifically, the first terminal of the second error processing unit is connected to the temperature measurement terminal, and the second error processing unit can acquire the temperature of the measurement point output by the temperature measurement terminal. The second error processing module can perform error processing on the temperature of the measurement point, that is, subtract the temperature of the measurement point from the temperature threshold Tref, thereby obtaining the temperature difference signal. Thus, the second error processing unit can know the temperature rise deviation of the power supply module through the above process.

[0137] S24. Superimpose the voltage error signal and the temperature difference signal to output a control signal.

[0138] Specifically, the output terminals of the first error processing unit and the second error processing unit are both connected to the superposition processing unit. The superposition unit can obtain the voltage error signal and the temperature difference signal, and perform superposition processing on the voltage error signal and the temperature difference signal to generate a control signal.

[0139] This invention also provides a display device. Figure 12 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 12 As shown, the display device 01 includes the power supply 02 of the display device provided in any embodiment of the present invention, and therefore has the beneficial effects of the power supply 02 of the display device provided in any embodiment of the present invention, which will not be described in detail here.

[0140] Specifically, the first output terminal OUT1 and the second output terminal OUT2 of the power supply 02 of the display device can supply power to the pixels 03 of the display device. Figure 13This is a schematic diagram of the structure of a display device powering a pixel, provided by an embodiment of the present invention. Figure 13 As shown, pixel 03 includes a first transistor M1, a second transistor M2, a third transistor M3 (M3-1 and M3-2), a fourth transistor M4 (M4-1 and M4-2), a fifth transistor M5, a sixth transistor M6, a driving transistor M7, a storage capacitor C1, and a light-emitting device D1. The first output terminal OUT1 of power supply 02 is connected to the source of the fifth transistor M5, and the second output terminal OUT2 of power supply 02 is connected to the cathode of the light-emitting device.

[0141] If the first transistor M1, second transistor M2, third transistor M3, fourth transistor M4, fifth transistor M5, sixth transistor M6, and driving transistor are all exemplarily shown as P-type transistors. During the light-emitting stage, the first scan signal provided by the first scan signal input terminal S1 is at a turn-off level, for example, a high level; the second scan signal provided by the second scan signal input terminal S2 is at a turn-off level, for example, a high level; the third scan signal provided by the third scan signal input terminal S3 is at a turn-off level, for example, a high level; and the light-emitting control signal provided by the light-emitting control signal input terminal EM is at a turn-on level, for example, a low level. At this time, the fifth transistor M5 and the sixth transistor M6 are turned on. The first power supply provided by the first output terminal OUT1 of the fifth transistor M5 output source 02 is output to the source of the driving transistor M7, increasing the gate-source voltage difference of the driving transistor M7. This makes the voltage difference between the source and gate of the driving transistor M7 greater than the threshold voltage of the driving transistor M7, thus turning on the driving transistor M7. The cathode of the light-emitting device D1 is electrically connected to the second output terminal OUT2 of the power supply O2. At this time, the driving transistor M7 provides driving current to the light-emitting device D1 through the sixth transistor M6, driving the light-emitting device D1 to emit light.

[0142] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0143] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A power supply, characterized in that, include: At least two power modules, at least two feedback regulation modules, and a first power processing module; The power module includes a control terminal and a second power terminal. The power module is used to output a second power from the second power terminal according to the control signal of the control terminal. At least one power module also includes a first power terminal, and the first power output from the first power terminal is supplied to the first output terminal of the power supply. The second power terminals of at least two power modules are connected to the second output terminal of the power supply. The first power processing module is connected to the feedback adjustment module, and the first power processing module is used to determine the reference current of the second power supply terminal of the power module. The feedback adjustment module is connected to the power module in a one-to-one correspondence. The feedback adjustment module is used to output a control signal to the control terminal of the power module according to the reference current of the second power terminal of the corresponding power module, the first voltage of the second output terminal, the temperature of the measurement point of the power module, and the acquisition current of the second power terminal.

2. The power supply according to claim 1, characterized in that, The power module also includes a temperature measurement terminal; the feedback adjustment module includes a first error processing unit, a second error processing unit, and a superposition processing unit. The first end of the first error processing unit is connected to the first power processing module, the second end of the first error processing unit is connected to the second power supply terminal, and the third end of the first error processing unit is connected to the second output terminal. The first error processing unit is used to acquire the reference current, the first voltage, and the sampled current, and to obtain a voltage error signal based on the reference current, the first voltage, and the sampled current; The first end of the second error processing unit is connected to the temperature measurement end. The second error processing unit is used to acquire the temperature of the measurement point and to obtain a temperature difference signal by subtracting the temperature of the measurement point from the temperature threshold. The output terminals of the first error processing unit and the second error processing unit are both connected to the superposition processing unit, which is used to superimpose the voltage error signal and the temperature difference signal to output a control signal.

3. The power supply according to claim 2, characterized in that, The first error processing unit includes a current error processing subunit, a superposition subunit, and a voltage error processing subunit; The first end of the current error processing subunit serves as the first end of the first error processing unit, and the second end of the current error processing subunit serves as the second end of the first error processing unit. The current error processing subunit is used to obtain a current error signal by subtracting the reference current and the acquired current. The first input terminal of the superposition subunit is connected to the output terminal of the current error processing subunit, and the superposition subunit is used to superimpose the current error signal with the reference voltage. The output terminal of the superposition subunit is connected to the first terminal of the voltage error processing subunit. The second terminal of the voltage error processing subunit serves as the third terminal of the first error processing unit. The output terminal of the voltage error processing subunit serves as the output terminal of the first error processing unit. The voltage error processing subunit is used to obtain a voltage error signal by subtracting the first voltage and the current error signal from the signal superimposed on the reference voltage.

4. The power supply according to claim 3, characterized in that, The current error processing subunit includes a first amplifier, the superposition subunit includes a first adder, and the voltage error processing subunit includes a second amplifier. The first input terminal of the first amplifier serves as the first terminal of the current error processing subunit, the second input terminal of the first amplifier serves as the second terminal of the current error processing subunit, and the output terminal of the first amplifier serves as the output terminal of the current error processing subunit. The first input terminal of the first adder serves as the first input terminal of the superposition subunit, the second input terminal of the first adder receives the reference voltage, and the output terminal of the first adder serves as the output terminal of the superposition subunit. The first input terminal of the second amplifier serves as the first terminal of the voltage error processing subunit, the second input terminal of the second amplifier serves as the second terminal of the voltage error processing subunit, and the output terminal of the second amplifier serves as the output terminal of the voltage error processing subunit.

5. The power supply according to claim 2, characterized in that, The second error processing unit includes a third amplifier, and the superposition processing unit includes a second adder; The first input terminal of the third amplifier serves as the first terminal of the second error processing unit, the second input terminal of the third amplifier receives the temperature threshold, and the output terminal of the third amplifier serves as the output terminal of the second error processing unit. The first input terminal of the second adder is connected to the output terminal of the first error processing unit, the second input terminal of the second adder is connected to the output terminal of the third amplifier, and the output terminal of the second adder is connected to the control terminal.

6. The power supply according to claim 2, characterized in that, The first output terminal is connected to the feedback adjustment module through the first power processing module. The first power processing module is used to determine the reference current of the second power terminal of the power module based on the current of the first output terminal and the number of power modules started.

7. The power supply according to claim 6, characterized in that, The first power supply and the second power supply have different voltage polarities.

8. The power supply according to claim 6, characterized in that, The power modules communicate with each other via wired communication, and each power module includes an electroluminescent chip. The electroluminescent chip includes a first pin, a second pin, a third pin, and a fourth pin. The first pin serves as the control terminal, the second pin serves as the first power supply terminal, the third pin serves as the second power supply terminal, and the fourth pin serves as the temperature measurement terminal.

9. The power supply according to claim 2, characterized in that, The first power processing module includes a divider; The first input terminal of the divider is connected to the first output terminal, and the output terminal of the divider is connected to the first terminal of the first error processing unit.

10. A power supply control method, characterized in that, The power supply includes at least two power modules; each power module includes a control terminal and a second power terminal, and at least one power module further includes a first power terminal, wherein the first power output from the first power terminal is supplied to the first output terminal of the power supply. At least two of the power modules have their second power terminals connected to the second output terminal of the power supply; the power control method includes: Obtain the load current; The number of power modules to be started is determined based on the load current; When the number of power modules started is greater than or equal to 2, a current shunting control strategy is adopted; The current shunt control strategy includes: determining the reference current of the second power supply terminal of the activated power supply module based on the load current and the number of activated power supply modules; Based on the reference current at the second power terminal of the corresponding power module, the first voltage at the second output terminal, the temperature at the measurement point of the power module, and the current collected at the second power terminal, a control signal is output to the control terminal of the power module. The second power supply is output from the second power supply terminal according to the control signal from the control terminal of the power supply module.

11. The power control method according to claim 10, characterized in that, Determining the number of power modules to be started based on the load current includes: If the load current is greater than the threshold current, then the number of power modules started is greater than or equal to 2; If the load current is less than or equal to the threshold current, then the number of power modules started is 1.

12. The power control method according to claim 11, characterized in that, The current at the first output terminal and / or the second output terminal is collected as the load current.

13. The power control method according to claim 11, characterized in that, Based on the reference current at the second power terminal of the corresponding power module, the first voltage at the second output terminal, the temperature at the measurement point of the power module, and the current collected at the second power terminal, a control signal is determined to be output to the control terminal of the power module, including: The current error signal is obtained by subtracting the reference current and the acquired current at the second power supply terminal. The current error signal is superimposed on the reference voltage; The voltage error signal is obtained by subtracting the first voltage and the current error signals from the signal superimposed on the reference voltage. The temperature at the measurement point is obtained, and the temperature difference signal is obtained by subtracting the temperature at the measurement point from the temperature threshold. The voltage error signal and the temperature difference signal are superimposed to output a control signal.

14. A display device, characterized in that, Includes the power source as described in any one of claims 1-9.

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