Flexible modular power supply suitable for micro display

Abstract

The invention discloses a flexible modular power supply suitable for a micro display. The flexible modular power supply comprises a power supply mainboard, a positive power supply daughter board, a negative power supply daughter board, a positive and negative power supply daughter board or a constant current source daughter board and an interface board, the power supply main board is provided with an MCU and an FPGA, the power supply main board supplies power, and the power supplied by the power supply main board is converted into system power through DCDC and LDO chips; the MCU of the power supply mainboard controls the DAC chip to adjust the voltage output of the DCDC, the DAC chip outputs a DAC signal to each power supply daughter board through a board-to-board connector, each power supply daughter board is a positive power supply daughter board, a negative power supply daughter board, a positive and negative power supply daughter board or a constant current source daughter board, and each power supply daughter board outputs a constant voltage source or a constant current source; and the FPGA of the power supply mainboard outputs a plurality of GPIOs (General Purpose Input / Output) which are connected to the interface board through golden fingers and FFC Through modular design, the power supply daughter boards can be freely combined, eight-channel negative-voltage constant-current source output is supported, and PGs with different voltage output capacities or current output capacities can be obtained by replacing the power supply daughter boards.

Description

Technical Field

[0001] The present invention relates to a modular power supply, and more particularly to a flexible modular power supply suitable for micro displays. Background Art

[0002] In the technical field of aging equipment for micro display screens, the Pattern Generator (PG) is a core component, and in recent years, significant technological breakthroughs and application innovations have emerged. Taking the MRD-MS210 series of PG equipment launched by Magical Micro Devices as an example, it supports multiple signal formats such as MIPI, eDP, and LVDS, and can generate ultra-high-definition standard signal sources (such as 8K@120Hz), meeting the high-precision test requirements of micro screens such as silicon-based OLED and Micro LED. Such equipment can not only simulate complex display modes (such as HDR and dynamic refresh rate), but also through voltage and current monitoring and Gamma calibration functions, achieve dynamic compensation of screen parameters during the aging process, solving the pain points of traditional equipment with single signals and insufficient response speed.

[0003] The upgrade of PG technology is also reflected in its multi-scenario adaptability. For example, Magical Micro Devices' MRD-ML112 series is designed for small and medium-sized screens, integrating high-precision power supplies (ripple noise < 10 mV) and intelligent protection mechanisms (OCP / OVP response < 1 ms), and can achieve stable signal output and real-time parameter adjustment throughout the R & D and production processes. In addition, the linkage between PG and AOI detection equipment (such as the combination of a 0.7μm resolution optical system and an AI judgment algorithm) further improves the automation level of aging tests, supporting the precise identification of microscopic defects from particle indentation to IC offset.

[0004] In the future, with the increasing requirements of AR / VR devices for screen weather resistance, PG technology will pay more attention to dynamic compensation and intelligent collaboration. For example, the color attenuation prediction model based on deep learning proposed by XinYing Technology, if combined with the real-time signal adjustment of PG, can dynamically correct display deviations caused by aging, promoting the development of aging equipment from single testing to the full link of "monitoring - compensation - optimization".

[0005] Since screen aging requires long-term continuous screen lighting, this requires the PG to be able to output the specific power required by the screen. Due to the particularity of the micro display industry, traditional PGs are generally customized equipment and are non-standard products. This results in the need for separate development for, for example, 1-to-2 (1 PG dots 2 screens), 1-to-8 (1 PG dots 8 screens), or 1-to-10 (1 PG dots 10 screens) according to different customers and screens. Different manufacturers also have different requirements for PGs, such as different numbers of current channels, voltage ranges, and maximum current capabilities, etc.

[0006] In summary, the prior art has the following problems:

[0007] (1) High cost: Since traditional PGs are all customized devices, it is necessary to separately develop 1-to-2, 1-to-4, or even 1-to-10 according to customer requirements, resulting in waste of cost and time.

[0008] (2) Lack of multiple selectivity: After the development of each model of PG, the performance parameters are relatively fixed. For example, the voltage and current parameters cannot be changed, and the number of power supply channels cannot be changed either.

[0009] (3) Large volume: Traditional aging PGs such as 1-to-8 and 1-to-10 are all very large in volume.

[0010] (4) No negative pressure constant current source: Traditional aging PGs do not have a negative pressure constant current source and only have a constant voltage source output. Summary of the Invention

[0011] To solve the problems of large volume and limited selectivity, the present invention provides a flexible modular power supply applicable to micro displays.

[0012] The present invention provides the following technical solutions:

[0013] A flexible modular power supply applicable to micro displays, comprising a power supply main board, a positive power supply sub-board, a negative power supply sub-board, a positive and negative power supply sub-board or a constant current source sub-board, and an interface board; the positive power supply sub-board is at the bottom of the power supply main board, and the negative power supply sub-board, the positive and negative power supply sub-board or the constant current source sub-board is at the top of the power supply main board;

[0014] The power supply main board has an MCU and an FPGA. The power supply main board supplies power, and the power supplied by the power supply main board is converted into system power through DCDC and LDO chips; the MCU of the power supply main board controls the DAC chip to adjust the voltage output of the DCDC. The DAC chip outputs a DAC signal to each power supply sub-board through a board-to-board connector. Each power supply sub-board is a positive power supply sub-board, a negative power supply sub-board, a positive and negative power supply sub-board or a constant current source sub-board, and each power supply sub-board outputs a constant voltage source or a constant current source; the FPGA of the power supply main board outputs multiple GPIOs and is connected to the interface board through a gold finger and an FFC connector.

[0015] Further, the positive power supply sub-board outputs an 8-channel 0.5 - 15V constant voltage source. The power supply main board provides a 24V power supply and 2-way DAC signals through a board-to-board connector. The 24V power supply is stepped down by 2 DCDC chips, and the voltage is controlled by 2 DAC signals. Behind the 2 DCDC chips, there are 2 groups of a total of 8 LDO chips for voltage regulation. Each DCDC chip drives 4 LDOs, and each LDO supports adjustable voltage. The MCU of the power supply main board communicates with 1 8-channel DAC of the positive power supply sub-board through SPI and outputs 8 DAC signals to control the LDO voltage.

[0016] Further, the negative power supply daughter board outputs an 8-channel -0.5 - 15V constant voltage source. The power supply main board provides a 24V power supply and two DAC signals through a board-to-board connector. The 24V power supply is converted from positive voltage to negative voltage by four DCDC chips, and the voltage is controlled by two DAC signals. One DAC signal controls two DCDC chips. Behind the four DCDC chips, there are four groups of a total of eight LDO chips for voltage regulation. Each DCDC chip drives two LDOs, and each LDO supports adjustable voltage. The MCU of the power supply main board communicates with an 8-channel DAC of the negative power supply daughter board through SPI, and outputs eight DAC signals to control the LDO voltage.

[0017] Further, the positive and negative power supply daughter board outputs a 6-channel -0.5 - 15V constant voltage source and a 12-channel 0.5 - 15V constant voltage source. The power supply main board provides a 24V power supply and nine DAC signals through a board-to-board connector. The 24V power supply is converted from positive voltage to negative voltage by three DCDC chips, and the voltage is controlled by three DAC signals. One DAC signal controls one DCDC chip. Behind the three DCDC chips, there are three groups of a total of six LDO chips for voltage regulation. Each DCDC chip drives two LDOs;

[0018] The 24V power supply is stepped down by six DCDC chips, and the voltage is controlled by six DAC signals. One DAC signal controls one DCDC chip. Behind the six DCDC chips, there are six groups of a total of twelve LDO chips for voltage regulation. Each DCDC chip drives two LDOs, and each LDO supports adjustable voltage. The MCU of the power supply main board communicates with three 8-channel DACs of the positive and negative power supply daughter board through SPI, and outputs 18 DAC signals to control the LDO voltage.

[0019] Further, the constant current source daughter board outputs an 8-channel 0 - 0.5A constant current source. The power supply main board provides a 24V power supply through a board-to-board connector. The 24V power supply is stepped down by eight DCDC chips. There are two 8-channel DACs on the constant current source daughter board. The FPGA of the power supply main board communicates with an 8-channel DAC of the constant current source daughter board through SPI, and outputs eight DAC signals to control the DCDC voltage. Behind each DCDC, there is one path of constant current source, and the current of each path of constant current source is adjustable. The MCU of the power supply main board communicates with another 8-channel DAC of the constant current source daughter board through SPI, and outputs eight DAC signals to control the constant current source current.

[0020] Further, the positive power supply daughter board, the negative power supply daughter board, the positive and negative power supply daughter board, or the constant current source daughter board is also connected to a voltage and current monitoring module, and communicates with the FPGA of the power supply main board through I2C signals to read the voltage and current in real time.

[0021] When overvoltage and overcurrent are detected, an alarm signal is also provided to the FPGA, and the FPGA will immediately turn off the enable pin of the power supply chip to protect the subsequent circuit.

[0022] Further, the MCU and the FPGA communicate through SPI. The MCU also has one interrupt signal and one reset signal connected to the FPGA to achieve interrupt and reset control.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Through modular design, the present invention can freely combine power sub-boards to achieve a minimum of 1-to-2 and a maximum of 1-to-10 PGs. It also supports 8-channel negative voltage constant current source output. By replacing the power sub-board, PGs with different voltage output capabilities or current output capabilities can be obtained, providing more choices.

[0025] 2. The present invention also provides an 8-channel constant current source sub-board with a negative voltage constant current source function. By inserting the constant current source sub-board, an 8-channel negative voltage constant current source can be obtained, with a current of 0 - 0.5A, good stability, and high controllability.

[0026] 3. The positive power sub-board is at the bottom of the power main board, and the negative power sub-board, positive and negative power sub-board, or constant current source sub-board is at the top of the power main board. The overall size of the machine is small, and the size is significantly reduced compared to the traditional 1-to-8 or 1-to-10 sizes.

[0027] 4. The cost is very low. The modular design adopts the method of inserting power sub-boards, which can freely form PGs from 1-to-2 to 1-to-10, avoiding the development of multiple PGs. At the same time, different parameter sub-boards can be inserted according to customer requirements, avoiding cost waste caused by high performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the schematic diagram of the present invention;

[0029] Figure 2 is the schematic diagram of the positive power sub-board of the present invention;

[0030] Figure 3 is the schematic diagram of the negative power sub-board of the present invention;

[0031] Figure 4 is the schematic diagram of the positive and negative power sub-board of the present invention;

[0032] Figure 5 is the schematic diagram of the constant current source sub-board of the present invention;

[0033] Figure 6 is the principle block diagram of the power main board of the present invention;

[0034] Figure 7 is the principle block diagram of the DCDC of the present invention;

[0035] Figure 8 is the principle block diagram of the LDO of the present invention.

[0036] In the figure: 1. Power supply main board; 2. Positive power supply sub-board; 3. Negative power supply sub-board; 4. Positive and negative power supply sub-board; 5. Interface board. Specific implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1 , a flexible modular power supply applicable to a micro display of the present invention,

[0039] includes 5 parts: power supply main board 1, positive power supply sub-board 2, negative power supply sub-board 3, positive and negative power supply sub-board 4 or constant current source sub-board, and interface board 5.

[0040] Among them, the positive power supply sub-board 2 is at the bottom of the power supply main board 1, and at most 6 positive power supply sub-boards can be inserted into 1 power supply main board. The power supply main board and the positive power supply sub-board are connected by 2 40Pin board-to-board connectors.

[0041] The negative power supply sub-board 3 is at the top of the power supply main board 1, and at most 3 negative power supply sub-boards can be inserted into 1 power supply main board. The power supply main board and the negative power supply sub-board are connected by 2 40Pin board-to-board connectors.

[0042] The positive and negative power supply sub-board 4 and the constant current source sub-board have the same external dimensions, and only 1 can be inserted into the power supply main board. When 1 positive and negative power supply sub-board is inserted, the constant current source sub-board cannot be inserted. The positive and negative power supply sub-board or the constant current source sub-board is at the top of the power supply main board and is connected by 2 40Pin board-to-board connectors.

[0043] There is 1 96pin and 1 170pin gold finger connector socket on the interface board 5. The power supply main board is connected to the interface board through the gold finger and the FFC connector. The gold finger is a type of connector.

[0044] The power supply main board is powered by 24V DCDC, and supports communication of 100M Ethernet port, Type-C interface, and RS485 interface. The computer communicates with the power supply main board through the network cable, and then controls the entire PG through the computer upper computer. The power supply main board uses MCU+FPGA as the main control. The FPGA can output 100 GPIOs, of which 80 GPIOs reach the interface board through the 170Pin gold finger, and the other 20 GPIOs are connected to the interface board through the FFC connector.

[0045] Figure 2As shown, the positive power supply daughter board can output an 8-channel constant voltage source of 0.5 - 15V, and the maximum current capabilities are of two specifications: 2A and 1A. The power supply main board provides 24V power supply and two DAC signals through a board-to-board connector. The 24V power supply is stepped down by two DCDC chips and voltage-controlled by two DAC signals. The relationship between the DAC voltage and the DCDC output voltage is Vo = 15.919 - 6.49Vd. Behind the two DCDC chips are two groups of a total of eight LDO chips for voltage regulation, with each DCDC chip driving four LDOs. Each LDO supports adjustable voltage. The MCU of the power supply main board communicates with an 8-channel DAC on the positive power supply daughter board through SPI, outputs eight DAC signals to control the LDO voltage, and the relationship between the DAC voltage and the LDO output voltage is Vo = 15.812 - 6.2Vd. The power supply has excellent performance, with a voltage ripple less than 10mv, and has functions of fast power-on and fast power-off, with a time less than 1ms. The positive power supply daughter board also has voltage and current monitoring, communicates with the FPGA of the power supply main board through I2C signals, can read the voltage and current in real time, and when overvoltage or overcurrent is detected, it also provides an alarm signal to the FPGA, and the FPGA will immediately turn off the enable pin of the power supply chip to protect the subsequent circuit.

[0046] Figure 3 As shown, the negative power supply daughter board can output an 8-channel constant voltage source of -0.5 - 15V, and the current range is 0 - 1A. The power supply main board provides 24V power supply and two DAC signals through a board-to-board connector. The 24V power supply is converted from positive voltage to negative voltage by four DCDC chips and voltage-controlled by two DAC signals. One DAC signal controls two DCDC chips. The relationship between the DAC voltage and the DCDC output voltage is VO = -16.4 + 6.5*VD. Behind the four DCDC chips are four groups of a total of eight LDO chips for voltage regulation, with each DCDC chip driving two LDOs. Each LDO supports adjustable voltage. The MCU of the power supply main board communicates with an 8-channel DAC on the negative power supply daughter board through SPI, outputs eight DAC signals to control the LDO voltage, and the relationship between the DAC voltage and the LDO output voltage is Vo = -16.086 + 6.5Vd. The power supply has excellent performance, with a voltage ripple less than 10mv, and has functions of fast power-on and fast power-off, with a time less than 1ms. The negative power supply daughter board also has voltage and current monitoring, communicates with the FPGA of the power supply main board through I2C signals, can read the voltage and current in real time, and when overvoltage or overcurrent is detected, it also provides an alarm signal to the FPGA, and the FPGA will immediately turn off the enable pin of the power supply chip to protect the subsequent circuit.

[0047] Figure 4As shown, the positive and negative power supply daughter board can output a 6-channel -0.5-15V constant voltage source and a 12-channel 0.5-15V constant voltage source, with a current range of 0-1A. The power supply main board provides 24V power and 9-way DAC signals through a board-to-board connector. The 24V power supply is converted from positive voltage to negative voltage by 3 DCDC chips, and the voltage is controlled by 3 DAC signals, with 1 DAC signal controlling 1 DCDC. The relationship between the DAC voltage and the DCDC output voltage is VO = -16.4 + 6.5*VD. Behind the 3 DCDC chips, there are 3 groups of a total of 6 LDO chips for voltage regulation, with each DCDC chip driving 2 LDOs; the 24V power supply is stepped down by 6 DCDC chips, and the voltage is controlled by 6 DAC signals, with 1 DAC signal controlling 1 DCDC. The relationship between the DAC voltage and the DCDC output voltage is Vo = 15.919 - 6.49Vd. Behind the 6 DCDC chips, there are 6 groups of a total of 12 LDO chips for voltage regulation, with each DCDC chip driving 2 LDOs. Each LDO supports adjustable voltage. The MCU on the power supply main board communicates with 3 8-channel DACs on the positive and negative power supply daughter board through SPI, outputting 18 DAC signals to control the LDO voltage. Among them, the relationship between the DAC voltage and the negative power supply LDO output voltage is Vo = -16.086 + 6.5Vd; the relationship between the DAC voltage and the positive power supply LDO output voltage is Vo = 16.225 - 6.5Vd. The power supply has excellent performance, with a voltage ripple less than 10mv, and has functions of fast power-on and fast power-off, with a time less than 1ms. The positive + negative power supply daughter board also has voltage and current monitoring, communicates with the FPGA on the power supply main board through I2C signals, can read the voltage and current in real time, and when overvoltage and overcurrent are detected, it also provides an alarm signal to the FPGA, and the FPGA will immediately turn off the enable pin of the power supply chip to protect the subsequent circuit.

[0048] Figure 5As shown in the figure, the constant current source daughter board can output an 8-channel 0-0.5A constant current source, and the maximum voltage supports -15V. The power supply main board provides 24V power through a board-to-board connector. The 24V power supply is stepped down by 8 DCDC chips. There are 2 8-channel DACs on the constant current source daughter board. The FPGA on the power supply main board communicates with one 8-channel DAC on the constant current source daughter board through SPI, outputs 8 DAC signals to control the DCDC voltage. The relationship between the DAC voltage and the DCDC output voltage is VOUT = -17.96 + 7.15*VD. Each DCDC is followed by a constant current source. The current of each constant current source is adjustable. The MCU on the power supply main board communicates with the other 8-channel DAC on the constant current source daughter board through SPI, outputs 8 DAC signals to control the constant current source current. The relationship between the DAC voltage and the constant current source current is Io = 0.2Vd. The constant current source daughter board also has voltage and current monitoring, communicates with the FPGA on the power supply main board through I2C signals, can read the voltage and current in real time. When overvoltage and overcurrent are detected, it also provides an alarm signal to the FPGA, and the FPGA will immediately turn off the enable pin of the power supply chip to protect the subsequent circuit.

[0049] Figure 6 As shown in the figure, the principle block diagram of the power supply main board. The MCU and FPGA are both on the power supply main board. The power supply main board is powered by 24V. The 24V is converted into various system voltages through DCDC and LDO chips: 27V, 18V, 12V, 5V, 3.3V, 1.8V, 1.0V, -18V, -3V, etc. Among them, the MCU is powered by 3.3V, and the FPGA is powered by 1.0V, 1.8V and 3.3V. The MCU has an Ethernet interface externally to communicate with the PC host computer, and also has a USB interface and an RS485 interface to support corresponding protocol communications. The MCU also has a FLASH memory with an SD protocol, and the memory has 16Gbit, which can store codes and various data. The MCU and FPGA communicate using the standard SPI protocol, with the MCU as the master and the FPGA as the slave. The MCU also has 1 interrupt signal and 1 reset signal connected to the FPGA to achieve interrupt and reset control. The MCU communicates with 4 8-channel DAC chips through the SPI protocol, and outputs 27 DACs to the power supply daughter boards (positive power supply daughter board, negative power supply daughter board, positive and negative power supply daughter board, constant current source daughter board) through a board-to-board connector to control the voltage output of the DCDC.

[0050] The principle block diagram of DCDC is as Figure 7 As shown in the figure, the DCDC circuit adopts a DCDC chip integration solution, and the output of the DCDC is adjusted by the DAC controlled by the MCU on the power supply main board. This DAC is a voltage output type, and using three resistors, the relationship between the DAC voltage and the output voltage can be found by Kirchhoff's current law.

[0051] The principle block diagram of LDO is as Figure 8As shown, similar to the DCDC voltage control method, an integrated LDO chip solution is adopted, using a voltage-type DAC. Through three resistors, the relationship between the DAC voltage and the output voltage can be found by Kirchhoff's current law. However, this DAC voltage is directly output by an 8-channel DAC on the power supply daughter board, and the power supply main board controls it through SPI signals.

[0052] Through modular design, the present invention can freely combine power supply daughter boards to achieve a minimum of 1-to-2 and a maximum of 1-to-10 PGs, and also supports the output of an 8-channel negative voltage constant current source. At the same time, the power supply daughter board can be replaced to achieve different voltage ranges and current ranges, and can make various choices according to different customers or different screens. In terms of cost, it can also reduce the R & D cost by reducing the R & D cycle.

[0053] Traditional PG generally only has a constant voltage source. The present invention can also provide an 8-channel constant current source daughter board that can output 8-channel negative voltage constant current sources. However, the price is that at most it can only achieve 1-to-8 and cannot achieve 1-to-10. If a constant current source is not required, 1-to-10 can be achieved by adding positive and negative power supply daughter boards.

[0054] The beneficial effects of the present invention:

[0055] 1. All power supplies are modular. By replacing the power supply daughter board, a PG with different voltage output capabilities or current output capabilities can be obtained, with many choices.

[0056] 2. It has a negative voltage constant current source function. By inserting a constant current source daughter board, an 8-channel negative voltage constant current source can be obtained, with a current of 0 - 0.5A, good stability, and high controllability.

[0057] 3. The overall size of the machine is small. Compared with the traditional 1-to-8 or 1-to-10 sizes, the length, width, and height dimensions of the present invention are 185 * 190 * 95 mm.

[0058] 4. The cost is very low. The modular design adopts the method of inserting a power supply daughter board, which can freely form a PG from 1-to-2 to 1-to-10, avoiding the development of multiple PGs. At the same time, different parameter daughter boards can be inserted according to customer requirements, avoiding waste of cost caused by high performance.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flexible modular power supply for a micro display, characterized in that: It comprises a power supply main board (1), a positive power supply sub-board (2), a negative power supply sub-board (3), a positive and negative power supply sub-board (4) or a constant current source sub-board and an interface board (5); the positive power supply sub-board (2) is at the bottom of the power supply main board (1), and the negative power supply sub-board (3), the positive and negative power supply sub-board (4) or the constant current source sub-board is at the top of the power supply main board (1); The power supply mainboard (1) has an MCU and an FPGA, and the power supply mainboard (1) supplies power, and converts the power supplied by the power supply mainboard into system power through DCDC and LDO chips; The MCU of the power main board (1) controls the DAC chip to adjust the voltage output of the DCDC. The DAC chip outputs a DAC signal which is given to each power sub-board through a board-to-board connector. Each power sub-board is a positive power sub-board, a negative power sub-board, a positive and negative power sub-board or a constant current source sub-board. Each power sub-board outputs a constant voltage source or a constant current source. The FPGA of the power main board outputs multiple GPIOs which are connected to the interface board through a gold finger and an FFC connector.

2. A flexible modular power supply suitable for a micro display according to claim 1, characterized in that: The positive power sub-board outputs 8 channels of 0.5-15V constant voltage source, the power main board provides 24V power and 2 DAC signals through a board-to-board connector, the 24V power is stepped down by 2 DCDC chips, and the voltage is controlled by 2 DAC signals, the 2 DCDC chips are followed by 2 groups of 8 LDO chips for voltage stabilization, each DCDC chip has 4 LDOs, and each LDO supports adjustable voltage, the MCU of the power main board communicates with an 8-channel DAC of the positive power sub-board through SPI, and outputs 8 DAC signals to control the LDO voltage.

3. A flexible modular power supply suitable for a micro display according to claim 1, characterized in that: The negative power sub-board outputs 8 channels of -0.5-15V constant voltage source, the power main board provides 24V power and 2 DAC signals through a board-to-board connector, the 24V power is converted from positive voltage to negative voltage through 4 DCDC chips, and the voltage is controlled by 2 DAC signals, 1 DAC signal controls two DCDCs, 4 DCDC chips are followed by 4 groups of 8 LDO chips for voltage stabilization, each DCDC chip has 2 LDOs, and each LDO supports adjustable voltage, the MCU of the power main board communicates with an 8-channel DAC of the negative power sub-board through SPI, and outputs 8 DAC signals to control the LDO voltage.

4. A flexible modular power supply suitable for a micro display according to claim 1, characterized in that: The positive and negative power sub-board outputs 6-channel -0.5-15V constant voltage source and 12-channel 0.5-15V constant voltage source. The power main board provides 24V power supply and 9 DAC signals through the board-to-board connector. The 24V power supply is converted from positive voltage to negative voltage through 3 DCDC chips. The voltage is controlled by 3 DAC signals. 1 DAC signal controls 1 DCDC. The 3 DCDC chips are followed by 3 groups of 6 LDO chips for voltage stabilization. Each DCDC chip has 2 LDOs. The 24V power supply uses 6 DCDC chips to step down the positive voltage, and 6 DAC signals are used for voltage control. 1 DAC signal controls 1 DCDC. The 6 DCDC chips are followed by 6 groups of 12 LDO chips for voltage stabilization. Each DCDC chip has 2 LDOs, and each LDO supports adjustable voltage. The MCU of the power supply mainboard communicates with the 3 8-channel DACs of the positive and negative power sub-boards through SPI, and outputs 18 DAC signals to control the LDO voltage.

5. A flexible modular power supply suitable for a micro display according to claim 1, characterized in that: The constant current source sub-board outputs 8-channel 0-0.5A constant current sources, the power supply main board provides 24V power supply through the board-to-board connector, the 24V power supply is stepped down through 8 DCDC chips, there are 2 8-channel DACs on the constant current source sub-board, the FPGA of the power supply main board communicates with an 8-channel DAC of the constant current source sub-board through SPI, and outputs 8 DAC signals to control the DCDC voltage, each DCDC is followed by a constant current source, and the current of each constant current source is adjustable, and the MCU of the power supply main board communicates with another 8-channel DAC of the cross-current source sub-board through SPI, and outputs 8 DAC signals to control the constant current source current.

6. A flexible modular power supply suitable for a micro display according to claim 1, characterized in that: The positive power sub-board, negative power sub-board, positive and negative power sub-board or cross-current source sub-board are also connected to the voltage and current monitoring module, and read the voltage and current in real time through I2C signal and FPGA communication of the power main board.

7. A flexible modular power supply suitable for a micro display according to claim 6, characterized in that: When overvoltage or overcurrent is detected, an alarm signal is also provided to the FPGA, and the FPGA will immediately turn off the power chip enable pin to protect the subsequent circuits.

8. The flexible modular power supply for a micro display according to claim 1, characterized in that: The MCU and FPGA communicate via SPI, and the MCU also has an interrupt signal and a reset signal connected to the FPGA to achieve interrupt and reset control.

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