Programmable power supply device for outputting negative voltage

Abstract

The utility model relates to a programmable power supply device for outputting negative voltage. The programmable power supply device comprises a negative voltage output module and a negative voltage adjusting module, wherein the adjusting output end of the negative voltage adjusting module is connected with the signal input end of the negative voltage output module, the power supply input end of the negative voltage output module is used for being connected with a power supply, and the negative voltage output end of the negative voltage output module is used for being connected with the negative electrode of a to-be-driven piece with negative voltage. The negative voltage regulation module comprises a negative voltage regulation sub-module and an isolated power supply sub-module; the adjusting output end of the negative voltage adjusting sub-module is connected with the signal input end of the negative voltage output module, the power input end of the negative voltage adjusting sub-module is connected with the positive electrode output end of the isolated power supply sub-module, and the power input end of the isolated power supply sub-module is connected with the power supply. By utilizing the technical scheme provided by the invention, negative pressure driving can be carried out on products with different negative pressure driving requirements, so that the negative pressure driving method can be suitable for application scenes of different negative pressure driving products, and the application range is expanded.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a programmable power supply device for outputting negative voltage. Background Technology

[0002] In power supply devices for microLED display chips, a high-power negative voltage power supply is typically used to connect to the cathode of the microLED display chip to drive the microLED display screen to light up. However, in the existing technology, a dedicated negative voltage chip is often used for power supply. However, the selection of existing negative voltage chips is limited and their cost is often high, so the use of negative voltage chips has a high degree of limitation. At the same time, since different microLED display chips require different driving voltages, the voltage needs to be adjusted at any time. However, there is no device in the existing technology to output different negative voltages. Utility Model Content

[0003] To address the problems of existing technologies, this application provides a technical solution for a programmable power supply device for outputting negative voltage. Specifically, this application sets up a negative voltage output module and a negative voltage regulation module. The negative voltage regulation submodule in the negative voltage regulation module outputs a negative voltage regulation signal to the negative voltage output module. The negative voltage output module then outputs a negative voltage corresponding to the negative voltage regulation signal, thereby adjusting the negative voltage value used by the negative voltage output module to drive the negative voltage driven device. This enables negative voltage driving for products with different negative voltage driving requirements, making it applicable to various negative voltage driving scenarios and increasing its applicability. Furthermore, the negative voltage output module can replace the negative voltage chip in existing technologies for negative voltage driving, reducing the difficulty of selecting and designing the negative voltage drive. The entire programmable power supply device is composed of multiple small components, thus reducing power supply costs and size.

[0004] This application provides a programmable power supply device for outputting negative voltage, including a negative voltage output module and a negative voltage regulation module;

[0005] The adjustment output terminal of the negative voltage adjustment module is connected to the signal input terminal of the negative voltage output module, the power supply input terminal of the negative voltage output module is used to connect to the power supply, and the negative voltage output terminal of the negative voltage output module is used to connect to the negative terminal of the device to be driven by negative voltage.

[0006] The negative voltage regulation module includes a negative voltage regulation submodule and an isolated power supply submodule. The regulation output terminal of the negative voltage regulation submodule is connected to the signal input terminal of the negative voltage output module, the power input terminal of the negative voltage regulation submodule is connected to the positive output terminal of the isolated power supply submodule, and the power input terminal of the isolated power supply submodule is connected to the power supply. The negative voltage regulation submodule is used to adjust the negative voltage value of the negative voltage output module for driving the negative voltage drive device.

[0007] Furthermore, the negative voltage output module includes a DC power output unit, a power inductor, a first capacitor, a first resistor, a second resistor, and a third resistor;

[0008] The power input terminal of the DC power output unit is connected to the power supply, the output terminal of the DC power output unit is connected to one end of the power inductor, the other end of the power inductor is grounded, and the other end of the power inductor is also connected to one end of the first resistor and the positive terminal of the first capacitor, respectively.

[0009] The other end of the first resistor is connected to the feedback terminal of the DC power output unit, one end of the second resistor, and one end of the third resistor, respectively. The other end of the third resistor is connected to the adjustment output terminal of the negative voltage adjustment module. The negative terminal of the first capacitor, the other end of the second resistor, and the ground terminal of the DC power output unit are all connected to the negative terminal of the device to be driven by negative voltage.

[0010] Furthermore, the negative voltage regulation submodule includes a voltage output control unit, a digital-to-analog conversion unit, and an operational amplifier unit;

[0011] The output terminal of the voltage output control unit is connected to the signal input terminal of the digital-to-analog converter unit, the signal output terminal of the digital-to-analog converter unit is connected to the input terminal of the operational amplifier unit, the output terminal of the operational amplifier unit is connected to the signal input terminal of the negative voltage output module, and the power input terminals of the digital-to-analog converter unit and the operational amplifier unit are both connected to the positive output terminal of the isolated power supply submodule.

[0012] Furthermore, the negative voltage regulation submodule also includes an isolation unit, the input terminal of which is connected to the output terminal of the voltage output control unit, and the output terminal of which is connected to the signal input terminal of the digital-to-analog conversion unit.

[0013] Furthermore, the operational amplifier unit includes a fourth resistor, a fifth resistor, and an operational amplifier;

[0014] One end of the fourth resistor is connected to the signal output terminal of the digital-to-analog converter, and the other end of the fourth resistor is connected to the inverting input terminal of the operational amplifier and one end of the fifth resistor. The other end of the fifth resistor is connected to the output terminal of the operational amplifier, and the non-inverting input terminal of the operational amplifier is used to receive a preset voltage value.

[0015] Furthermore, the negative voltage output module also includes a second capacitor, the positive terminal of which is connected to the output terminal of the power supply and the power input terminal of the DC power supply output unit, respectively, and the negative terminal of the second capacitor is grounded.

[0016] Furthermore, the negative output terminal of the isolated power supply submodule is connected to the negative terminal of the negative voltage driving device.

[0017] Furthermore, the voltage output control unit is a microcontroller unit.

[0018] Furthermore, the digital-to-analog conversion unit is a digital-to-analog converter.

[0019] Furthermore, the isolation unit is an isolator.

[0020] Implementing this application will have the following beneficial effects:

[0021] This application sets up a negative voltage output module and a negative voltage regulation module. The negative voltage regulation submodule in the negative voltage regulation module outputs a negative voltage regulation signal to the negative voltage output module. Then, the negative voltage output module outputs a negative voltage corresponding to the negative voltage regulation signal to adjust the negative voltage value of the negative voltage output module to drive the negative voltage driven device. This enables negative voltage driving for products with different negative voltage driving requirements, thus making it applicable to different application scenarios of negative voltage driven products and increasing its applicability. Furthermore, the negative voltage output module can replace the negative voltage chip in the prior art for negative voltage driving, thereby reducing the difficulty of selecting and designing negative voltage drive. Moreover, the entire programmable power supply device is composed of multiple small components, thereby reducing power supply cost and power supply size. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0023] Figure 1 A schematic diagram of a programmable power supply device for outputting negative voltage, provided as an embodiment of this application;

[0024] Figure 2 A circuit diagram corresponding to the programmable power supply device for outputting negative voltage provided in the embodiments of this application;

[0025] In the figure, the corresponding labels are: 1-Negative voltage output module; 11-DC power supply output unit; 12-Power inductor; 13-First capacitor; 14-First resistor; 15-Second resistor; 16-Third resistor; 17-Second capacitor; 2-Negative voltage regulation module; 21-Negative voltage regulation sub-module; 211-Voltage output control unit; 212-Digital-to-analog conversion unit; 213-Operating amplifier unit; 2131-Fourth resistor; 2132-Fifth resistor; 2133-Operating amplifier; 214-Isolation unit; 22-Isolated power supply sub-module; 3-Driven device to be driven by negative voltage. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Hereinafter, embodiments will be described with reference to the accompanying drawings, which are not intended to limit the disclosure described in the claims.

[0029] Please see Figure 1 and Figure 2 The following is combined with Figure 1 and Figure 2 A programmable power supply device for outputting negative voltage, provided in the embodiments of this application, will be described in detail.

[0030] This application provides a programmable power supply device for outputting negative voltage, such as... Figure 1 and Figure 2 As shown, specifically, the programmable power supply device for outputting negative voltage includes a negative voltage output module 1 and a negative voltage regulation module 2.

[0031] The negative voltage adjustment module 2 has its adjustment output terminal connected to the signal input terminal of the negative voltage output module 1. The power supply input terminal of the negative voltage output module 1 is connected to the power supply, and the negative voltage output terminal of the negative voltage output module 1 is connected to the negative terminal of the device to be driven by negative voltage 3. The negative voltage adjustment module 2 includes a negative voltage adjustment submodule 21 and an isolated power supply submodule 22. The adjustment output terminal of the negative voltage adjustment submodule 21 is connected to the signal input terminal of the negative voltage output module 1. The power supply input terminal of the negative voltage adjustment submodule 21 is connected to the positive output terminal of the isolated power supply submodule 22. The power supply input terminal of the isolated power supply submodule 22 is connected to the power supply. The negative voltage adjustment submodule 21 is used to adjust the negative voltage value of the negative voltage output module 1 to drive the device to be driven by negative voltage 3.

[0032] In this embodiment, the negative voltage output module 1 is used to drive the negative voltage driven component 3 under negative voltage, and the negative voltage adjustment module 2 is used to output a negative voltage adjustment signal to the negative voltage output module 1 so that the negative voltage output module 1 outputs a negative voltage corresponding to the negative voltage adjustment signal. Thus, the negative voltage output module 1 can drive the negative voltage driven component 3 under negative voltage. Specifically, the negative voltage adjustment submodule 21 in the negative voltage adjustment module 2 can output a negative voltage adjustment signal to the negative voltage output module 1 so that the negative voltage output module 1 outputs a negative voltage corresponding to the negative voltage adjustment signal. This allows the negative voltage value of the negative voltage output module 1 to drive the negative voltage driven component 3 under negative voltage, enabling negative voltage driving for products with different negative voltage driving requirements. This is applicable to different application scenarios of negative voltage driving products and increases its applicability.

[0033] In one specific embodiment, the isolated power supply submodule 22 is used to supply power to the negative voltage regulation submodule 21, further, as... Figure 2 As shown, the negative output terminal of the isolated power supply submodule 22 is connected to the negative terminal of the negative pressure driven component 3, thereby enhancing the ability of the negative pressure driven component 3 to be driven by the isolated power supply submodule 22.

[0034] In practical applications, the isolated power supply submodule 22 can be an isolated power supply device, and the negative voltage driving device 3 is a display chip that needs to be driven by negative voltage. For example, the negative voltage driving device 3 can be a microLED display chip. It should be noted that the negative voltage driving device 3 can also be other display chips that need to be driven by negative voltage, which is not specifically limited here.

[0035] In one alternative implementation, such as Figure 2As shown, the negative voltage output module 1 includes a DC power output unit 11, a power inductor 12, a first capacitor 13, a first resistor 14, a second resistor 15, and a third resistor 16. The power input terminal of the DC power output unit 11 is connected to a power supply. The output terminal of the DC power output unit 11 is connected to one end of the power inductor 12, and the other end of the power inductor 12 is grounded. The other end of the power inductor 12 is also connected to one end of the first resistor 14 and the positive terminal of the first capacitor 13. The other end of the first resistor 14 is connected to the feedback terminal of the DC power output unit 11, one end of the second resistor 15, and one end of the third resistor 16. The other end of the third resistor 16 is connected to the adjustment output terminal of the negative voltage adjustment module 2. The negative terminal of the first capacitor 13, the other end of the second resistor 15, and the ground terminal of the DC power output unit 11 are all connected to the negative terminal of the negative voltage driving component 3.

[0036] In this embodiment, the DC power output unit 11 is used to output a negative voltage value to the negative voltage driving device 3. For example, the DC power output unit 11 can be a DC-DC power chip, wherein the SW pin of the DC-DC power chip is the output pin, the FB pin is the feedback input pin, and the GND pin is used to connect to the negative terminal of the negative voltage driving device 3. Furthermore, the connections between the DC power output unit 11, the power inductor 12, the first capacitor 13, the first resistor 14, the second resistor 15, and the third resistor 16 are arranged as follows... Figure 2 The topological layout shown is designed to enable negative pressure driving of the negative pressure driving device 3, thereby replacing the negative pressure chip in the prior art for negative pressure driving, which helps to reduce the difficulty of selecting and designing negative pressure driving.

[0037] In one specific embodiment, by grounding the other end of the power inductor 12 and the positive terminal of the first capacitor 13, and simultaneously connecting the negative terminal of the first capacitor 13, the other end of the second resistor 15, and the ground terminal of the DC power output unit 11 to the negative terminal of the negative voltage driving device 3, the negative voltage output can be achieved using the above connection topology, thereby driving the negative voltage driving device 3 that requires negative voltage driving.

[0038] Specifically, based on the layout structure of the negative voltage output module 1, its corresponding circuit parameter formula is as follows:

[0039] V fb / R 15 = (V o -V fb ) / R 14 + (V s1 -V fb ) / R 16

[0040] Among them, V fbR is the feedback voltage input to the DC power supply output unit 31. 15 The resistance value of the second resistor is 15V, V o R is the DC voltage output by the DC power supply output unit 31. 14 The resistance value of the first resistor 14 is V. s1 R is the regulated voltage output by the negative voltage regulation module 2. 16 This is the resistance value of the third resistor, 16.

[0041] When the resistance values ​​of the first resistor 14 and the third resistor 16 are equal, and by rearranging the above formula, the absolute value of the DC voltage output by the DC power supply output unit 31 can be obtained as follows:

[0042] V o = (2 + R 14 / R 15 )*V fb - V s1

[0043] Furthermore, given the feedback voltage input to the DC power output unit 31 and the regulation voltage output by the negative voltage regulation module 2, the DC voltage output by the DC power output unit 31 can be further determined, thereby enabling the regulation of the DC voltage output by the DC power output unit 31.

[0044] It should be noted that the DC voltage output by the DC power supply output unit 31 is a negative voltage relative to the input reference ground, where the input reference ground is the ground terminal.

[0045] In one alternative implementation, such as Figure 2 As shown, the negative voltage output module 1 also includes a second capacitor 17. The positive terminal of the second capacitor 17 is connected to the output terminal of the power supply and the power input terminal of the DC power supply output unit 11, respectively. The negative terminal of the second capacitor 17 is grounded. Specifically, this application sets the second capacitor 17 to ensure the stability of the output of the negative voltage output module 1.

[0046] In one specific implementation, such as Figure 2 As shown, the negative voltage regulation submodule 21 includes a voltage output control unit 211, a digital-to-analog converter 212, and an operational amplifier unit 213. The output terminal of the voltage output control unit 211 is connected to the signal input terminal of the digital-to-analog converter 212, the signal output terminal of the digital-to-analog converter 212 is connected to the input terminal of the operational amplifier unit 213, the output terminal of the operational amplifier unit 213 is connected to the signal input terminal of the negative voltage output module 1, and the power input terminals of both the digital-to-analog converter 212 and the operational amplifier unit 213 are connected to the positive output terminal of the isolated power supply submodule 22. In an optional embodiment, such as... Figure 2 As shown, the negative voltage regulation submodule 21 also includes an isolation unit 214. The input terminal of the isolation unit 214 is connected to the output terminal of the voltage output control unit 211, and the output terminal of the isolation unit 214 is connected to the signal input terminal of the digital-to-analog conversion unit 212.

[0047] Specifically, the voltage output control unit 211 is used to output different voltage values, the isolation unit 214 is used for level conversion and signal isolation between the voltage output control unit 211 and the digital-to-analog conversion unit 212, thereby achieving compatibility of positive and negative voltage digital level logic, the digital-to-analog conversion unit 212 is used to convert the signal output by the isolation unit 214 into an analog signal, and the operational amplifier unit 213 is used to output an adjustable voltage to the negative voltage output module 1 to adjust the output voltage of the negative voltage output module 1, so as to adapt to the application scenarios of the negative voltage driving device 3 with different negative driving voltages and increase its applicability.

[0048] In practical applications, the voltage output control unit 211 can be a microcontroller, the digital-to-analog converter 212 can be a digital-to-analog converter, and the isolation unit 214 can be an isolator. Preferably, the isolation unit 214 is an I2C isolator. The main function of the I2C isolator is to provide electrical isolation and signal transmission between the two circuits to prevent direct conduction of current and voltage, thereby protecting the voltage output control unit 211 and the digital-to-analog converter 212 from potential electrical interference or damage.

[0049] In one specific implementation, such as Figure 2 As shown, the operational amplifier unit 213 includes a fourth resistor 2131, a fifth resistor 2132, and an operational amplifier 2133; wherein, one end of the fourth resistor 2131 is connected to the signal output terminal of the digital-to-analog converter unit 212, the other end of the fourth resistor 2131 is connected to the inverting input terminal of the operational amplifier 2133 and one end of the fifth resistor 2132, the other end of the fifth resistor 2132 is connected to the output terminal of the operational amplifier 2133, and the non-inverting input terminal of the operational amplifier 2133 is used to receive a preset voltage value.

[0050] Specifically, after conversion by the operational circuit composed of the fourth resistor 2131, the fifth resistor 2132, and the operational amplifier 2133, the regulated voltage output by the negative voltage regulation submodule 21 through the operational amplifier 2133 is:

[0051] V s1 =(1+R 2132 / R 2131 )*V ref1 - (R 2132 / R 2131 )*V dac

[0052] Among them, V s1 To regulate the voltage, R 2132 R is the resistance value of the fifth resistor 2132. 2131 The resistance value of the fourth resistor 2131 is V. ref1 For the preset voltage value, V dac The voltage value output by the digital-to-analog converter 212 is used as the basis for determining the absolute value of the DC voltage output by the DC power supply output unit 31. Substituting the adjusted voltage output by the negative voltage adjustment submodule 21 through the operational amplifier 2133 into the absolute value of the DC voltage output by the DC power supply output unit 31, the following can be obtained:

[0053] V o =(2 + R 14 / R 15 )*V fb -(1+R 2132 / R 2131 )*V ref1 + (R 2132 / R 2131 )*V dac

[0054] The DC voltage output by the DC power supply output unit 31 is negative relative to the input reference ground, where the input reference ground is the ground terminal.

[0055] Furthermore, the output voltage of the digital-to-analog conversion unit 212 can be adjusted by the voltage output control unit 211, thereby adjusting the adjustment voltage output by the operational amplifier unit 213, and thus controlling the negative voltage value output by the negative voltage output module 1. That is, when the negative voltage adjustment submodule 21 outputs different voltages to the negative voltage output module 1, the negative voltage output module 1 outputs a negative voltage value corresponding to its voltage. In this way, the negative voltage adjustment submodule 21 can adjust the negative voltage value output by the negative voltage output module 1 to realize the programmability of the negative voltage output by the negative voltage output module 1, so as to be applicable to the application scenarios of products driven by different negative voltages, increasing its applicability. Furthermore, the entire programmable power supply device is composed of multiple small components, thereby reducing the power supply cost and power supply volume.

[0056] The above embodiments of this application have the following beneficial effects:

[0057] This application sets up a negative voltage output module and a negative voltage regulation module. The negative voltage regulation submodule in the negative voltage regulation module outputs a negative voltage regulation signal to the negative voltage output module. Then, the negative voltage output module outputs a negative voltage corresponding to the negative voltage regulation signal to adjust the negative voltage value of the negative voltage output module to drive the negative voltage driven device. This enables negative voltage driving for products with different negative voltage driving requirements, thus making it applicable to different application scenarios of negative voltage driven products and increasing its applicability. Furthermore, the negative voltage output module can replace the negative voltage chip in the prior art for negative voltage driving, thereby reducing the difficulty of selecting and designing negative voltage drive. Moreover, the entire programmable power supply device is composed of multiple small components, thereby reducing power supply cost and power supply size.

[0058] The structure shown in this embodiment is only a partial structure related to the solution of this application and does not constitute a limitation on the device to which the solution of this application is applied. Specific devices may include more or fewer components than shown, or combinations of certain components, or arrangements of different components. It should be understood that the methods, apparatuses, etc., disclosed in this embodiment can be implemented in other ways.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A programmable power supply device for outputting a negative voltage, characterized in that, It includes a negative voltage output module (1) and a negative voltage regulation module (2); The adjustment output terminal of the negative voltage adjustment module (2) is connected to the signal input terminal of the negative voltage output module (1), the power supply input terminal of the negative voltage output module (1) is used to connect to the power supply, and the negative voltage output terminal of the negative voltage output module (1) is used to connect to the negative terminal of the negative voltage driving device (3). The negative voltage regulation module (2) includes a negative voltage regulation submodule (21) and an isolated power supply submodule (22); the regulation output terminal of the negative voltage regulation submodule (21) is connected to the signal input terminal of the negative voltage output module (1), the power input terminal of the negative voltage regulation submodule (21) is connected to the positive output terminal of the isolated power supply submodule (22), the power input terminal of the isolated power supply submodule (22) is connected to the power supply, and the negative voltage regulation submodule (21) is used to adjust the negative voltage value of the negative voltage output module (1) for negative voltage driving of the negative voltage driving device (3).

2. The programmable power supply device according to claim 1, characterized in that, The negative voltage output module (1) includes a DC power output unit (11), a power inductor (12), a first capacitor (13), a first resistor (14), a second resistor (15), and a third resistor (16); The power input terminal of the DC power output unit (11) is connected to the power supply, the output terminal of the DC power output unit (11) is connected to one end of the power inductor (12), the other end of the power inductor (12) is grounded, and the other end of the power inductor (12) is also connected to one end of the first resistor (14) and the positive terminal of the first capacitor (13). The other end of the first resistor (14) is connected to the feedback terminal of the DC power output unit (11), one end of the second resistor (15) and one end of the third resistor (16), respectively. The other end of the third resistor (16) is connected to the adjustment output terminal of the negative voltage adjustment module (2). The negative terminal of the first capacitor (13), the other end of the second resistor (15) and the ground terminal of the DC power output unit (11) are all connected to the negative terminal of the negative voltage driving device (3).

3. The programmable power supply device according to claim 1, characterized in that, The negative voltage regulation submodule (21) includes a voltage output control unit (211), a digital-to-analog conversion unit (212), and an operational amplifier unit (213); The output terminal of the voltage output control unit (211) is connected to the signal input terminal of the digital-to-analog converter (212). The signal output terminal of the digital-to-analog converter (212) is connected to the input terminal of the operational amplifier unit (213). The output terminal of the operational amplifier unit (213) is connected to the signal input terminal of the negative voltage output module (1). The power input terminals of the digital-to-analog converter (212) and the operational amplifier unit (213) are both connected to the positive output terminal of the isolated power supply submodule (22).

4. The programmable power supply device according to claim 3, characterized in that, The negative voltage regulation submodule (21) further includes an isolation unit (214), the input terminal of which is connected to the output terminal of the voltage output control unit (211), and the output terminal of which is connected to the signal input terminal of the digital-to-analog conversion unit (212).

5. The programmable power supply device according to claim 3, characterized in that, The operational amplifier unit (213) includes a fourth resistor (2131), a fifth resistor (2132), and an operational amplifier (2133); One end of the fourth resistor (2131) is connected to the signal output terminal of the digital-to-analog converter (212), and the other end of the fourth resistor (2131) is connected to the inverting input terminal of the operational amplifier (2133) and one end of the fifth resistor (2132). The other end of the fifth resistor (2132) is connected to the output terminal of the operational amplifier (2133). The non-inverting input terminal of the operational amplifier (2133) is used to receive a preset voltage value.

6. The programmable power supply device according to claim 2, characterized in that, The negative voltage output module (1) further includes a second capacitor (17), the positive terminal of which is connected to the output terminal of the power supply and the power input terminal of the DC power output unit (11), and the negative terminal of which is grounded.

7. The programmable power supply device according to claim 1, characterized in that, The negative output terminal of the isolated power supply submodule (22) is connected to the negative terminal of the negative pressure drive unit (3).

8. The programmable power supply device according to claim 3, characterized in that, The voltage output control unit (211) is a microcontroller unit.

9. The programmable power supply device according to claim 3, characterized in that, The digital-to-analog conversion unit (212) is a digital-to-analog converter.

10. The programmable power supply device according to claim 4, characterized in that, The isolation unit (214) is an isolator.

Images