Low-dropout linear stabilized power supply system

Abstract

The utility model discloses a low-dropout linear stabilized power supply system, which relates to the technical field of electronic circuits and comprises a main controller, a digital-to-analog conversion module and a plurality of power supply conversion units. The main controller outputs a voltage control signal and a first channel selection signal to the digital-to-analog conversion module, and the digital-to-analog conversion module converts the voltage control signal into a first output voltage and outputs the first output voltage from a specified channel according to the channel selection signal. Each power supply conversion unit corresponds to one digital-to-analog conversion channel and comprises an LDO conversion module and a plurality of drivers, the LDO conversion module receives the first output voltage and outputs a stable second output voltage to the drivers under the control of the LDO conversion module, the drivers perform power conversion processing on the second output voltage to obtain a third output voltage, the third output voltage is connected to an external load, and the external load is connected with the digital-to-analog conversion channel. And meanwhile, the driver is started and stopped under the control of the main controller. According to the system, flexible adjustment of voltage and independent control of multiple channels are realized, and meanwhile, by adopting the LDO conversion module, voltage ripples are reduced, and pure power supply output is provided.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a low voltage difference linear regulated power supply system. Background Art

[0002] In modern electronic devices, industrial control systems, automotive electronic systems, and radio frequency modules, the quality of power management technology directly impacts system performance and reliability. As electronic devices become increasingly versatile and complex, the demands placed on their power supplies are also increasing. These devices not only require stable and accurate voltage outputs, but also demand low noise, low ripple, high load capacity, multi-channel outputs, and flexible control methods.

[0003] Traditional DC regulated power supplies are primarily categorized as linear power supplies and switching power supplies. Linear regulators, such as the common 78XX series chips, typically require an input voltage 2V to 3V higher than the output voltage, limiting their use in low-dropout applications. Furthermore, when operating in an amplified state, linear regulators generate significant heat, resulting in significant energy loss and low efficiency. To address voltage regulation issues when the difference between input and output voltages is small, low-dropout linear regulators (LDOs) are widely used. LDOs maintain a stable output voltage by adjusting the impedance of the internal regulator tube. They offer stable output voltage, low noise, and minimal ripple, making them ideal for applications requiring high power quality, such as analog circuits and RF modules.

[0004] However, traditional LDOs have limitations in load capacity and control flexibility. As the number of loads or current increases, a single LDO may not be able to meet the power supply requirements of the high load, or multiple LDOs may need to be connected in parallel, increasing system design complexity and cost. Furthermore, the output voltage of traditional LDOs is typically fixed. Changing the output voltage often requires hardware such as replacing resistors, making it impossible to achieve real-time and flexible voltage adjustment and difficult to adapt to diverse application requirements. While switching power supplies (DC-DC converters) offer advantages in energy conversion efficiency, their high-frequency switching operation generates significant voltage ripple and electromagnetic interference (EMI), which can adversely affect devices sensitive to power supply noise. Especially in high-precision analog and RF circuits, excessive ripple and noise can reduce the system's signal-to-noise ratio, impacting device performance and stability. Ripple and noise issues can become even more severe as the number of loads increases, increasing circuit design complexity and cost.

[0005] Therefore, how to design a power supply system with low noise, low ripple, strong load capacity, support for multi-channel output, and flexible voltage control has become a technical problem that needs to be solved urgently. Utility Model Content

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a low voltage drop linear regulated power supply system that can flexibly control the output voltage and has the advantages of low noise and low ripple, strong load capacity, and support for multi-channel output.

[0007] According to an embodiment of the present application, a low-voltage-difference linear regulated power supply system includes: a main controller; a digital-to-analog conversion module, wherein an input end of the digital-to-analog conversion module is connected to a first output end of the main controller, the digital-to-analog conversion module includes a plurality of digital-to-analog conversion channels, the digital-to-analog conversion module receives a voltage control signal and a first channel selection signal output by the main controller, the digital-to-analog conversion module converts the voltage control signal to obtain a first output voltage, and outputs the first output voltage from at least one of the digital-to-analog conversion channels according to the first channel selection signal; and a plurality of power conversion units, wherein the power conversion units correspond one-to-one to the digital-to-analog conversion channels, each of the power conversion units includes a low-voltage dropout (LDO) conversion module and a plurality of drivers, wherein an input end of the LDO conversion module is electrically connected to an output end of a corresponding digital-to-analog conversion channel, the LDO conversion module receives the first output voltage and outputs a second output voltage under control of the first output voltage, each of the drivers receives the second output voltage, and is configured to perform power conversion processing on the second output voltage to obtain a third output voltage, the third output voltage being connected to an external load, and each of the drivers is started and stopped under control of a second channel selection signal output from a second output end of the main controller.

[0008] According to the embodiment of the present application, the low-voltage difference linear regulated power supply system has at least the following beneficial effects: the main controller outputs a voltage control signal and a first channel selection signal to the digital-to-analog conversion module. After receiving these signals, the digital-to-analog conversion module converts the voltage control signal into a first output voltage and outputs it from the specified channel according to the channel selection signal. Each power conversion unit corresponds to a digital-to-analog conversion channel, ensuring a certain degree of independence and stability between multiple output channels, and can simultaneously provide different voltages required for multiple different external loads. The digital-to-analog conversion module converts the voltage control signal from the main controller into an analog voltage, realizing digital control of the voltage. By changing the voltage control signal output by the main controller, the first output voltage can be flexibly adjusted, thereby indirectly controlling the second output voltage output by the LDO conversion module, and ultimately affecting the third output voltage output by the driver. This design enables the system to adjust the output voltage in real time according to demand, adapt to different application scenarios, and improve the flexibility of power management. At the same time, the LDO (low-voltage difference linear regulator) has the characteristics of low noise and low ripple, enabling the system to provide stable and pure voltage output. The driver in each power conversion unit receives the second output voltage, performs power conversion processing on it, and obtains a third output voltage capable of driving an external load. The driver is started and stopped under the control of the second channel selection signal output by the main controller, and can be flexibly controlled according to load requirements. Since the first channel selection signal and the second channel selection signal respectively control the output channel of the digital-to-analog conversion module and the operating status of the driver, precise management of each channel is achieved. This design can selectively enable or disable specific channels according to the requirements of different loads, optimizing system performance and power consumption.

[0009] According to some embodiments of the present application, the low-voltage difference linear regulated power supply system of the embodiment also includes a slave controller, the input end of the slave controller is connected to the second output end of the main controller, the output end of the slave controller is respectively connected to the control end of the driver, the slave controller receives the second channel selection signal and the clock signal output by the main controller, and controls the working state of each of the drivers according to the second channel selection signal and the clock signal.

[0010] According to some embodiments of the present application, the low-voltage difference linear regulated power supply system of the embodiment also includes a switch array, which is arranged between the power conversion unit and the external load. The switch array includes a plurality of relays, each of the relays corresponds to the driver one-to-one, each of the relays is arranged between the corresponding driver and the external load, and each of the relays is synchronously turned on or off with the corresponding driver.

[0011] According to some embodiments of the present application, the control end of the switch array is connected to a trigger unit, the input end of the trigger unit is connected to the third output end of the main controller, the output end of the trigger unit is connected to the control end of the switch array, the trigger unit receives the third channel selection signal output by the main controller, the trigger unit includes several trigger channels, each trigger channel corresponds to one of the relays, and the trigger channel keeps the corresponding relay in an on or off state according to the third channel selection signal.

[0012] According to some embodiments of the present application, an operational amplifier is further provided between each of the digital-to-analog conversion channels and the corresponding LDO conversion module, the input end of the operational amplifier is connected to the output end of the digital-to-analog conversion channel, and the output end of the operational amplifier is connected to the input end of the corresponding LDO conversion module. The operational amplifier is used to isolate and reduce noise of the first output voltage.

[0013] According to some embodiments of the present application, the low voltage difference linear regulated power supply system of the embodiment further includes a power supply module, the power supply module includes a DCDC converter circuit, the input end of the power supply module is connected to an external power supply, and the output end of the power supply module is connected to the power input end of each of the LDO conversion modules.

[0014] According to some embodiments of the present application, the LDO conversion module includes an LDO chip and a voltage adjustment circuit; the power input pin of the LDO chip is connected to the power input end of the LDO conversion module, and the enable pin of the LDO chip is connected in series with a voltage divider resistor and then connected to the power input end of the LDO conversion module; the voltage adjustment circuit includes a first resistor and a second resistor connected in series, one end of the first resistor is connected to the input end of the LDO conversion module, one end of the second resistor is connected to the output pin of the LDO chip, the feedback pin of the LDO chip is connected between the first resistor and the second resistor, and the output end of the LDO conversion module is connected to the output pin of the LDO chip.

[0015] According to some embodiments of the present application, the LDO conversion module further includes a filter capacitor and a protection resistor, one end of the filter capacitor is connected to the output end of the LDO conversion module, and the other end is grounded; one end of the protection resistor is connected to the output end of the LDO conversion module, and the other end is grounded.

[0016] According to some embodiments of the present application, the number of the digital-to-analog conversion channels is 4, and the number of the drivers included in one power conversion unit is 16.

[0017] According to some embodiments of the present application, the main controller is a field programmable gate array. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a system structure diagram of the low voltage difference linear regulated power supply system according to an embodiment of the present application;

[0020] Figure 2 This is a circuit structure diagram of the LDO conversion module in an embodiment of the present application.

[0021] Reference numerals:

[0022] Main controller 100 ; digital-to-analog conversion module 200 ; power conversion unit 300 ; LDO conversion module 310 ; driver 320 ; switch array 400 ; relay 410 ; slave controller 500 ; trigger unit 600 ; operational amplifier 700 . DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0024] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0025] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0027] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0028] like Figure 1 As shown, the low-voltage-difference linear regulated power supply system of the embodiment includes a main controller 100, a digital-to-analog conversion module 200, and a power conversion unit 300. The main controller 100 presets standard voltage information and outputs a voltage control signal for setting the output voltage level of the digital-to-analog conversion module 200. At the same time, the main controller 100 also outputs a first channel selection signal for selecting a specific channel of the digital-to-analog conversion module 200, thereby achieving multi-channel output control. The digital-to-analog conversion module 200 includes a plurality of digital-to-analog conversion channels. The digital-to-analog conversion module 200 receives the voltage control signal from the main controller 100 and converts it into an analog voltage, namely a first output voltage. Based on the first channel selection signal, the module selectively activates a specific digital-to-analog conversion channel, causing the first output voltage to be output from the designated channel. Each power conversion unit 300 corresponds to a digital-to-analog conversion channel. Each power conversion unit 300 includes a group of LDO conversion modules 310 and multiple drivers 320. The input end of the LDO conversion module 310 (low-voltage difference linear regulator) receives the first output voltage, and after buck-stabilization processing, outputs a stable second output voltage. Each driver 320 receives the second output voltage of the LDO conversion module 310, which is used to improve the load capacity of the power supply, provide a larger current output, and ensure that sufficient power is provided to the external load. Finally, the third output voltage output by the driver 320 is connected to the external load.

[0029] During the operation of the system, the main controller 100 generates a voltage control signal and a first channel selection signal according to the preset standard voltage information, and sends them to the digital-to-analog conversion module 200; the digital-to-analog conversion module 200 converts the voltage control signal into a first output voltage, and outputs it from a specific digital-to-analog conversion channel according to the first channel selection signal; the LDO conversion module 310 in the power conversion unit 300 receives the first output voltage, and outputs a stable second output voltage after voltage reduction and voltage stabilization processing; the driver 320 receives the second output voltage, improves the load capacity, and outputs a third output voltage to supply the external load. The low voltage difference linear regulated power supply system of the embodiment adopts the LDO conversion module 310, which reduces the power supply ripple, and the output voltage is stable and does not change with the load. The application of the driver 320 improves the load capacity of the power supply and can support more load channels.

[0030] In some embodiments, the control end of each driver 320 is electrically connected to the output end of the main controller 100 and receives a second channel selection signal. When the second channel selection signal indicates activation, the driver 320 receives the second output voltage from the LDO conversion module 310, improves the load capacity, and outputs a third output voltage to the external load; when the second channel selection signal indicates deactivation, the driver 320 stops working, cuts off the power supply to the corresponding load, and reduces energy consumption. The main controller 100 determines which drivers 320 need to be enabled according to the preset working mode and external instructions, and then the main controller 100 generates the corresponding second channel selection signal and sends it to each driver 320. Optionally, the second channel selection signal can be sent directly by the main controller 100 to the enable end (such as the EN pin) of the driver 320. The driver 320 enters the enabled or disabled state according to the received control signal to control the power supply to the external load. In a system with multiple load channels, when the system detects a load change, the main controller 100 can dynamically adjust the second channel selection signal, start and stop the corresponding driver 320 in real time, and only enable the required driver 320 to reduce unnecessary energy consumption.

[0031] It is understandable that in a multi-channel power supply control system, a controller directly controlling all drivers 320 may lead to problems such as insufficient signal driving capability, increased delay, and increased system complexity. In addition, the resources of a single controller are limited and it is difficult to meet the control requirements of high density and multi-channel. Therefore, in some embodiments, a master-slave controller architecture is adopted. Figure 1The low-voltage-difference linear regulated power supply system of the embodiment further includes a slave controller 500. The input of the slave controller 500 is connected to the output of the main controller 100, and the output of the slave controller 500 is respectively connected to the control terminals of the drivers 320. The slave controller 500 receives the second channel selection signal and clock signal output by the main controller 100 and controls the operating state of each driver 320 based on the second channel selection signal. The slave controller 500 also utilizes the clock signal to synchronize with the main controller 100, ensuring the accuracy of signal transmission and processing. During system operation, the main controller 100 determines the driver 320 to be enabled based on system settings or external input, generates the corresponding second channel selection signal, and sends the second channel selection signal and clock signal to the slave controller 500. After receiving the second channel selection signal, the slave controller 500 controls the start and stop states of each driver 320. The slave controller 500 buffers and distributes signals, enhancing the system's signal driving capability, adapting to the control requirements of a large number of drivers 320, and achieving efficient control of multiple drivers 320. This overcomes the limitations of direct control by the main controller 100 and improves the reliability and scalability of the system. Optionally, in high-speed or long-distance signal transmission from the main controller 100 to the slave controller 500, differential signal transmission may be adopted in consideration of signal integrity. For example, the main controller 100 sends control information to the slave controller 500 via a differential signal, and the slave controller 500 generates a second channel selection signal based on the received signal to control the start and stop of the driver 320.

[0032] like Figure 1 In some embodiments, the low-voltage-dropout linear regulated power supply system further includes a switch array 400, which is disposed between the power conversion unit 300 and the external load to further control the connection and disconnection of the external load. The switch array 400 is composed of a plurality of relays 410, each corresponding to a driver 320. The relays 410 are disposed between the corresponding driver 320 and the external load, enabling independent control of each load channel. Each relay 410 is turned on or off synchronously with the corresponding driver 320. When the driver 320 is started or stopped under the control of the second channel selection signal output by the main controller 100, the relays 410 are also turned on or off synchronously. By adding the switch array 400 between the driver 320 and the external load, the system can achieve precise control of each load channel, meeting the needs of complex application scenarios. In the event of an emergency power outage, the main controller 100 can quickly shut down the corresponding relay 410, cutting off power to the external load and protecting the safety of the system and the load.

[0033] Furthermore, to enhance control over each relay 410 in the switch array 400, a trigger unit 600 is added to the low-voltage-dropout linear regulated power supply system of the embodiment, enabling the system to not only control the on / off switching of the relays 410 but also maintain their state. The trigger unit 600 is composed of several trigger channels, each corresponding to a relay 410. Common trigger types can be D flip-flops, JK flip-flops, or latches, selected based on actual needs and performance requirements. The input of the trigger unit 600 is connected to the output of the main controller 100 to receive a third channel selection signal output by the main controller 100. The output of the trigger unit 600 is connected to the control terminal of the switch array 400. In other words, the output of each trigger channel directly controls the start / stop state of the corresponding relay 410. During system operation, the main controller 100 generates a third channel selection signal according to system requirements or preset logic, and sends it to the trigger unit 600 through the output port. This signal is used to indicate the target state of each relay 410; when the state of the relay 410 needs to be changed, the main controller 100 updates the third channel selection signal; under the control of the clock signal, the trigger unit 600 samples the new signal and updates the output to control the state change of the relay 410; when the output of the trigger channel is high, the corresponding relay 410 is controlled to be turned on, connecting the power conversion unit 300 with the external load; when the output of the trigger channel is low, the corresponding relay 410 is controlled to be turned off, disconnecting the power conversion unit 300 from the external load. Of course, in order to ensure the correct operation of the trigger, in addition to updating the third channel selection signal, the main controller 100 also needs to provide a synchronized clock signal to ensure that the trigger samples the signal at a predetermined time point. This is a common practice in the industry and is not described here. Similarly, since the output current of the trigger is limited, in actual application, a driver device (such as a transistor or MOSFET) can be added between the trigger output and the control terminal of the relay 410 to enhance the driving capability. Through trigger unit 600, the system can achieve precise start and stop control for each relay 410, meeting complex load management requirements. Because the trigger has a latching function, it can maintain the current state of relay 410 when there is no new control signal. In this case, the main controller 100 does not need to continuously output control signals, reducing resource usage and improving system efficiency.

[0034] like Figure 1In some embodiments, to further improve the voltage stability and reduce noise interference of the low-dropout linear regulated power supply system, an operational amplifier 700 is added between each digital-to-analog conversion channel and the corresponding LDO conversion module 310. The input (non-inverting input) of each operational amplifier 700 is connected to the output of the corresponding digital-to-analog conversion channel to receive the first output voltage signal after digital-to-analog conversion. The output of the operational amplifier 700 is connected to the input of the corresponding LDO conversion module 310 to provide a stable control voltage for the LDO. The operational amplifier 700 acts as a voltage follower with high input impedance and low output impedance. It buffers the input signal, achieves signal isolation, and prevents the subsequent circuit from affecting the output signal of the previous digital-to-analog conversion channel. The operational amplifier 700 also has excellent common-mode rejection ratio and low noise characteristics, capable of filtering out high-frequency noise and interference in the input signal, providing a pure control voltage signal. Because the operational amplifier 700 operates in voltage follower mode, the output voltage is substantially consistent with the input voltage, but has stronger drive capability, meeting the control signal requirements of the LDO conversion module 310.

[0035] In some embodiments, to provide a stable input power source for the LDO converter module 310, a power module is added to the low-voltage dropout linear regulated power supply system. This power module utilizes a DC-DC converter circuit to convert an external high-voltage power source into a low-voltage power source suitable for the LDO converter module 310. For example, assuming the external high-voltage power source is +24V and the LDO converter module's power input is +5V, the power module circuit can consist of a TPS40055 chip, a half-bridge switch circuit, and its peripheral components. A filter capacitor and shielded inductor are added to the external 24V power input to suppress electromagnetic interference on the power line. The TPS40055 controls an external high-efficiency MOSFET to achieve synchronous rectification and improve conversion efficiency. A large-capacity filter capacitor is configured at the +5V output to reduce output voltage ripple and noise. The stable +5V voltage is then output through a power distribution network to the power input of each LDO converter module 310 in the system. Based on the first output voltage, the LDO converter module 310 further adjusts the +5V voltage to the required, precise second output voltage, which is then output to each driver 320. By introducing a power module including a DCDC converter circuit, high voltage power is obtained from the outside and converted into a voltage input suitable for the LDO conversion module 310, the conversion efficiency is high, the power loss is reduced, and the overall efficiency of the system is improved.

[0036] For example, the circuit structure of the LDO conversion module 310 is as follows: Figure 2As shown, the circuit includes an LP38501ATJ adjustable low-dropout linear regulator IC and its peripheral components, designed to convert a high input voltage into a stable low voltage. Specifically, the VIN pin is connected to the power input of the LDO converter module, which is connected in parallel with a filter capacitor C181 to filter out ripple and noise from the input power supply voltage. The power input of the LDO converter module is also connected to the EN pin via resistor R54 to control the chip's enable state. The GND pin is connected to ground, providing a reference ground potential. The first output voltage is input to the LDO converter module from the DA3_OA_LDO port in the circuit diagram. The DA3_OA_LDO port is connected in series with resistors R60 and R56, and then to the VOUT pin, forming a voltage divider network. The ADJ pin is connected to the node between R60 and R56 and implements feedback regulation of the output voltage by detecting the voltage at the divider point. The output port of the LDO converter module 310 is directly connected to the OUT pin, which is connected in parallel with several filter capacitors and protection resistors to ensure the stability of the output voltage of the LDO converter module 310.

[0037] For example, in the embodiment of the low-voltage-dropout linear regulated power supply system, the master controller 100 and the slave controller 500 are both FPGAs (field programmable gate arrays), the number of digital-to-analog conversion channels is specifically four, and the number of drivers 320 included in each power conversion unit 300 is specifically 16. In this case, the entire embodiment of the low-voltage-dropout linear regulated power supply system includes a total of four power conversion units 300. Because each power conversion unit 300 includes 16 drivers 320, that is, one power conversion unit 300 corresponds to 16 outputs, the entire system includes a total of 64 drivers 320. The corresponding switch array 400 includes 64 relays 410, and the entire system can carry 64 loads. These 64 outputs can be selectively enabled or disabled according to the needs of different loads. Specifically, because the 16 outputs of the same power conversion unit 300 receive voltages controlled by the same voltage control signal, all 16 outputs have the same output voltage.

[0038] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A low voltage difference linear regulated power supply system, characterized in that: include: Main controller; a digital-to-analog conversion module, wherein an input end of the digital-to-analog conversion module is connected to a first output end of the main controller, the digital-to-analog conversion module includes a plurality of digital-to-analog conversion channels, the digital-to-analog conversion module receives a voltage control signal and a first channel selection signal output by the main controller, the digital-to-analog conversion module converts the voltage control signal to obtain a first output voltage, and outputs the first output voltage from at least one of the digital-to-analog conversion channels according to the first channel selection signal; A plurality of power conversion units, each corresponding one to the digital-to-analog conversion channel, each comprising an LDO conversion module and a plurality of drivers, an input end of the LDO conversion module being electrically connected to an output end of the corresponding digital-to-analog conversion channel, the LDO conversion module receiving the first output voltage and outputting a second output voltage under control of the first output voltage, each of the drivers receiving the second output voltage, and configured to perform power conversion processing on the second output voltage to obtain a third output voltage, the third output voltage being connected to an external load, and each of the drivers being started and stopped under control of a second channel selection signal output from a second output end of the main controller.

2. The low voltage dropout linear regulated power supply system according to claim 1, wherein: It also includes a slave controller, the input end of the slave controller is connected to the second output end of the master controller, the output end of the slave controller is respectively connected to the control end of the driver, the slave controller receives the second channel selection signal and the clock signal output by the master controller, and controls the working state of each of the drivers according to the second channel selection signal and the clock signal.

3. The low voltage dropout linear regulated power supply system according to claim 1, wherein: It also includes a switch array, which is arranged between the power conversion unit and the external load. The switch array includes a plurality of relays, each of which corresponds to the driver one by one, each of which is arranged between the corresponding driver and the external load, and each of the relays is turned on or off synchronously with the corresponding driver.

4. The low voltage dropout linear regulated power supply system according to claim 3, wherein: The control end of the switch array is connected to a trigger unit, the input end of the trigger unit is connected to the third output end of the main controller, and the output end of the trigger unit is connected to the control end of the switch array. The trigger unit receives a third channel selection signal output by the main controller. The trigger unit includes several trigger channels, each of which corresponds to one of the relays. The trigger channel keeps the corresponding relay in an on or off state according to the third channel selection signal.

5. The low voltage dropout linear regulated power supply system according to claim 1, wherein: An operational amplifier is further provided between each digital-to-analog conversion channel and the corresponding LDO conversion module. The input end of the operational amplifier is connected to the output end of the digital-to-analog conversion channel, and the output end of the operational amplifier is connected to the input end of the corresponding LDO conversion module. The operational amplifier is used to isolate and reduce noise of the first output voltage.

6. The low voltage dropout linear regulated power supply system according to claim 1, wherein: It also includes a power supply module, which includes a DCDC converter circuit. The input end of the power supply module is connected to an external power supply, and the output end of the power supply module is connected to the power input end of each LDO conversion module.

7. The low voltage dropout linear regulated power supply system according to any one of claims 1 to 6, characterized in that: The LDO conversion module includes an LDO chip and a voltage adjustment circuit; The power input pin of the LDO chip is connected to the power input end of the LDO conversion module, and the enable pin of the LDO chip is connected to the power input end of the LDO conversion module after being connected in series with a resistor; The voltage adjustment circuit includes a first resistor and a second resistor connected in series, one end of the first resistor is connected to the input end of the LDO conversion module, one end of the second resistor is connected to the output pin of the LDO chip, a feedback pin of the LDO chip is connected between the first resistor and the second resistor, and the output end of the LDO conversion module is connected to the output pin of the LDO chip.

8. The low voltage dropout linear regulated power supply system according to claim 7, wherein: The LDO conversion module also includes a filter capacitor and a protection resistor. One end of the filter capacitor is connected to the output end of the LDO conversion module and the other end is grounded. One end of the protection resistor is connected to the output end of the LDO conversion module and the other end is grounded.

9. The low voltage dropout linear regulated power supply system according to any one of claims 1 to 6, characterized in that: The number of the digital-to-analog conversion channels is 4, and the number of the drivers included in one power conversion unit is 16.

10. The low voltage dropout linear regulated power supply system according to any one of claims 1 to 6, characterized in that: The main controller is a field programmable gate array.

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