Power supply circuit and apparatus, and electric device

Abstract

The present application discloses a power supply circuit and apparatus, and an electric device. The power supply circuit comprises a plurality of power supply modules; each power supply module comprises a power supply unit, a current sampling unit, a current equalizing unit, and a feedback unit; an output end of the power supply unit is configured to be connected to a load; an input end of the current sampling unit is connected to the load; the current equalizing unit is used for outputting a reference voltage on the basis of an average current of the plurality of power supply modules; and the feedback unit is used for outputting a first feedback signal to the power supply unit on the basis of the reference voltage and a first sampling voltage outputted by the current sampling unit, such that the power supply unit regulates an outputted power supply voltage on the basis of the first feedback signal.

Description

A power supply circuit, device, and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411441448.7, filed on October 15, 2024, entitled “A power supply circuit, apparatus and electrical equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power supply technology, specifically to a power supply circuit, device, and electrical equipment. Background Technology

[0003] Television screens are getting bigger and bigger, and their power consumption is increasing accordingly. Therefore, the single power supply in a television set is currently unable to meet the high power demand. Technical issues

[0004] Currently, the single power supply in a television set cannot meet the high power demand. Technical solutions

[0005] This application provides a power supply circuit, device, and electrical equipment that can alleviate the problem that the power supply in current televisions cannot meet the high-power demand.

[0006] This application provides a power supply circuit, which includes multiple power modules, each power module comprising:

[0007] The power supply unit has its output terminal connected to the load.

[0008] The current sampling unit has its input terminal connected to the load.

[0009] The current sharing unit has its input connected to the output of the current sampling unit, and its output connected to the outputs of the current sharing units in other power modules. The current sharing unit is used to output a reference voltage based on the average current of multiple power modules.

[0010] The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal.

[0011] In some embodiments of the power supply circuit, the output current of multiple power modules is equal.

[0012] In some embodiments of the power supply circuit, the current sampling unit includes a sampling subunit and an amplification subunit, the input terminal of the sampling subunit is connected to the load, and the input terminal of the amplification subunit is connected to the input terminal of the sampling subunit.

[0013] The sampling subunit is used to output a first sampled voltage based on the current flowing through the load in the power module; the amplification subunit is used to amplify the first sampled voltage.

[0014] In some embodiments of the power supply circuit, the sampling subunit includes a first resistor, one end of which is connected to the load and the other end of which is grounded.

[0015] In some embodiments of the power supply circuit, the amplification subunit includes a first amplifier, the non-inverting input terminal of the first amplifier is connected to the input terminal of the sampling subunit, the inverting input terminal of the first amplifier is grounded, and the output terminal of the first amplifier is connected to the feedback unit and the current sharing unit.

[0016] In some embodiments of the power supply circuit, the feedback unit includes a second amplifier, the non-inverting input terminal of the second amplifier is connected to the amplification subunit, the inverting input terminal of the second amplifier is connected to the output terminal of the current sharing unit, and the output terminal of the second amplifier is connected to the power supply unit.

[0017] In some embodiments of the power supply circuit, the first amplifier and the second amplifier are integrated.

[0018] In some power supply circuits, the current sharing unit includes a second resistor, one end of which is connected to the output terminal of the current sampling unit, and the other end of which is connected to the output terminal of the current sharing unit in other power modules.

[0019] In some embodiments of the power supply circuit, the power module further includes a current limiting unit, which is connected to the second input terminal of the feedback unit; the current limiting unit is used to limit the output current of the power supply unit.

[0020] In some embodiments of the power supply circuit, the current limiting unit includes a Zener diode, the positive terminal of which is grounded, and the negative terminal of which is connected to the second input terminal of the feedback unit.

[0021] In some embodiments of the power supply circuit, the power supply unit includes a power supply subunit and a feedback subunit. The output terminal of the power supply subunit is used to connect to the load and provide a corresponding power supply voltage to the load.

[0022] The input terminal of the feedback subunit is connected to the output terminals of the feedback unit and the power supply subunit, and the output terminal of the feedback subunit is connected to the feedback terminal of the power supply subunit. The feedback subunit is used to sample the power supply voltage to obtain a second sampled voltage, and output a second feedback signal to the power supply subunit according to the first feedback signal and the second sampled voltage, so that the power supply subunit adjusts the power supply voltage according to the second feedback signal.

[0023] In some embodiments of the power supply circuit, the feedback subunit includes a first voltage divider resistor, a second voltage divider resistor, a third voltage divider resistor, and a voltage regulator. One end of the first voltage divider resistor is connected to the output terminal of the power supply subunit, and the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor. The other end of the second voltage divider resistor is connected to one end of the third voltage divider resistor and the first terminal of the voltage regulator. The other end of the third voltage divider resistor is grounded. The first terminal of the voltage regulator is also connected to the output terminal of the feedback unit. The second terminal of the voltage regulator is grounded, and the third terminal of the voltage regulator is connected to the feedback terminal of the power supply subunit.

[0024] This application embodiment also provides a power supply device, which includes a power supply circuit; the power supply circuit includes a plurality of power modules, each power module including: a power unit, the output terminal of the power unit being used to connect to a load;

[0025] A current sampling unit, the input terminal of which is connected to the load;

[0026] A current sharing unit is provided, the input of which is connected to the output of the current sampling unit, and the output of which is connected to the output of the current sharing units in the other power modules. The current sharing unit is used to output a reference voltage based on the average current of the multiple power modules.

[0027] The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal.

[0028] In some embodiments of the power supply device, the output current of the plurality of power modules is equal.

[0029] In some embodiments of the power supply device, the current sampling unit includes a sampling subunit and an amplification subunit, the input terminal of the sampling subunit is connected to the load, and the input terminal of the amplification subunit is connected to the input terminal of the sampling subunit;

[0030] The sampling subunit is used to output a first sampling voltage based on the current flowing through the load in the power module; the amplification subunit is used to amplify the first sampling voltage.

[0031] In some embodiments of the power supply device, the sampling subunit includes a first resistor, one end of which is connected to the load and the other end of which is grounded.

[0032] In some embodiments of the power supply device, the amplification subunit includes a first amplifier, the non-inverting input terminal of the first amplifier is connected to the input terminal of the sampling subunit, the inverting input terminal of the first amplifier is grounded, and the output terminal of the first amplifier is connected to the feedback unit and the current sharing unit.

[0033] In some embodiments of the power supply device, the feedback unit includes a second amplifier, the non-inverting input terminal of the second amplifier is connected to the amplification subunit, the inverting input terminal of the second amplifier is connected to the output terminal of the current sharing unit, and the output terminal of the second amplifier is connected to the power supply unit.

[0034] In some embodiments of the power supply device, the first amplifier and the second amplifier are integrated.

[0035] This application also discloses an electrical device, which includes a power supply circuit; the power supply circuit includes multiple power modules, each power module including a power unit, the output terminal of which is used to connect to a load;

[0036] A current sampling unit, the input terminal of which is connected to the load;

[0037] A current sharing unit is provided, the input of which is connected to the output of the current sampling unit, and the output of which is connected to the output of the current sharing units in the other power modules. The current sharing unit is used to output a reference voltage based on the average current of the multiple power modules.

[0038] The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal. Beneficial effects

[0039] This application provides a power supply circuit, device, and electrical equipment. The power supply circuit is equipped with multiple power modules. Each power module is connected in parallel with other power modules through a current sharing unit. The power units in each power module jointly supply power to the load. This is equivalent to multiple power modules connected in parallel supplying power to the same load. Compared with a single power supply supplying power to the load, this can improve the power supply power of the power supply circuit and thus meet the load's demand for high power. Attached Figure Description

[0040] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0041] Figure 1 is a structural block diagram of the first embodiment of the power supply circuit provided in this application.

[0042] Figure 2 is a structural block diagram of the second embodiment of the power supply circuit provided in this application.

[0043] Figure 3 is a structural block diagram of the current sampling unit in the power supply circuit provided in the embodiment of this application.

[0044] Figure 4 is a structural block diagram of the power supply unit in the power supply circuit provided in the embodiment of this application.

[0045] Figure 5 is a circuit diagram of the current sampling unit, current sharing unit, feedback unit, and feedback sub-unit in the power supply circuit provided in the embodiment of this application. Detailed Implementation

[0046] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Please refer to Figure 1. This embodiment provides a power supply circuit, which includes multiple power modules 10. Each power module 10 includes a power supply unit 11, a current sampling unit 12, a current sharing unit 13, and a feedback unit 14. The output terminal of the power supply unit 11 is connected to the load 20 and provides a corresponding power supply voltage, such as Vout, to the load 20. The input terminal of the current sampling unit 12 is connected to the load 20. The input terminal of the current sharing unit 13 is connected to the output terminal of the current sampling unit 12, and the output terminal of the current sharing unit 13 is connected to the output terminals of the current sharing units 13 in other power modules 10. The first input terminal of the feedback unit 14 is connected to the output terminal of the current sampling unit 12, the output terminal of the feedback unit 14 is connected to the feedback terminal of the power supply unit 11, and the second input terminal of the feedback unit 14 is connected to the output terminal of the current sharing unit 13.

[0049] In a specific embodiment, the current sampling unit 12 is used to obtain a first sampling voltage based on the current flowing through the load 20 of the power module. The first sampling voltages of multiple power modules 10 are connected in parallel through the current sharing unit 13 to obtain the average current value of the multiple power modules 10. The corresponding current sharing unit 13 is used to output a reference voltage to the second input terminal of the feedback unit 14 based on the average current of the multiple power modules 10. The feedback unit 14 is used to compare and amplify the reference voltage (i.e., the average current value input to the second input terminal) with the first sampling voltage and output a first feedback signal to the power unit 11. This allows the power unit 11 to adjust the supply voltage of the power module based on the first feedback signal, thereby adjusting the output current of the power module 10 to achieve the purpose of balancing the output current of each power module 10. This achieves current sharing among the power modules 10, ensuring that the output current and power of each power module 10 are the same.

[0050] The power supply circuit of this application is provided with multiple power modules 10. Each power module 10 is connected in parallel with other power modules 10 through a current sharing unit 13. The power supply unit 11 in each power module 10 jointly supplies power to the load 20. This is equivalent to multiple power modules 10 connected in parallel supplying power to the same load 20, thereby increasing the power supply power of the power supply circuit and meeting the high power requirements of the load 20.

[0051] Referring to Figure 2, in some embodiments, each power module 10 further includes a current limiting unit 15, which is connected to the output terminal of the current sharing unit 13 (i.e., the second input terminal of the feedback unit 14). The current limiting unit 15 is used to limit the output current of the power module 11. Specifically, in this embodiment, the current limiting unit 15 is used to limit the reference voltage. When the first sampling voltage is greater than the set limit voltage, the feedback unit 14 quickly controls the output voltage of the power module to decrease, thereby limiting the output current of the power module 10 and ensuring the reliability of the power supply circuit.

[0052] Referring to Figure 3, in some embodiments, the current sampling unit 12 includes a sampling subunit 121 and an amplification subunit 122. The input terminal of the sampling subunit 121 is connected to the load 20, and the input terminal of the amplification subunit 122 is connected to the input terminal of the sampling subunit 121. The sampling subunit 121 is used to output a first sampling voltage based on the current flowing through the load 20. The amplification subunit 122 is used to amplify the first sampling voltage and then output it to the feedback unit 14.

[0053] In this embodiment, the sampling subunit 121 is connected between the load 20 and the ground of the power module 10 (each power module 10 is independent of the others). It samples the current flowing through the load 20, i.e., the output current of the power module 10. Based on this current, it provides a first sampling voltage to the amplification subunit 122. After amplification by the amplification subunit 122, the voltage is output to the feedback unit 14. This allows for subsequent comparison of the first sampling voltage with a reference voltage (i.e., the average current of multiple power modules) to output a corresponding first feedback signal. This feedback adjustment of the output voltage of the power module 10 ensures current sharing across all power modules 10. It should be noted that the sampling subunit 121 in this embodiment can also be located at the output terminal of the power module 10 for sampling; this application does not limit this.

[0054] Referring to Figure 4, in some embodiments, the power supply unit 11 includes a power supply subunit 111 and a feedback subunit 112. The output terminal of the power supply subunit 111 is used to connect to the load 20 and provide a corresponding power supply voltage to the load 20. The input terminal of the feedback subunit 112 is connected to the feedback unit 14 and the output terminal of the power supply subunit 111, and the output terminal of the feedback subunit 112 is connected to the feedback terminal of the power supply subunit 111. The feedback subunit 112 is used to sample the power supply voltage to obtain a second sampled voltage, and output a second feedback signal to the power supply subunit 111 according to the first feedback signal and the second sampled voltage, so that the power supply subunit 111 adjusts the power supply voltage according to the second feedback signal.

[0055] In this embodiment, the feedback subunit 112 samples the output voltage (supply voltage) of the power supply subunit 111 to obtain a second sampled voltage. The first feedback signal output by the feedback unit 14 is added to the second sampled voltage and amplified to output a second feedback signal to the power supply subunit 111. The power supply subunit 111 then adjusts the output current according to the second feedback signal, thereby regulating the supply voltage. It should be noted that the power supply subunit 111 in this embodiment is a known circuit structure, such as a switching power supply circuit. Therefore, the specific structure of the power supply subunit 111 will not be described in detail in this application.

[0056] Please refer to Figure 5. As one embodiment, the sampling subunit 121 includes a first resistor R1. One end of the first resistor R1 is connected to the load 20, and the other end is grounded. In this embodiment, the first resistor R1 is a current sampling resistor. A first sampling voltage is obtained based on the resistance value of the first resistor R1 and the current flowing through it. The first sampling voltage is then amplified by the amplification subunit 122 and output to the feedback unit 14 for subsequent comparison of the output current of the corresponding power module 10 with the average current. In this embodiment, sampling of the output current is achieved by setting a resistor, resulting in a simple circuit structure.

[0057] In one embodiment, the amplification subunit 122 includes a first amplifier. The non-inverting input of the first amplifier is connected to the input of the sampling subunit 121, the inverting input of the first amplifier is grounded, and the output of the first amplifier is connected to the feedback unit 14 and the current sharing unit 13. In this embodiment, the amplifier is used to amplify the first sampled voltage and output it to the feedback unit 14 so that the output current of the corresponding power module 10 can be compared with the average current.

[0058] In one embodiment, the feedback unit 14 includes a second amplifier. The non-inverting input of the second amplifier is connected to the amplification subunit 122, the inverting input of the second amplifier is connected to the output of the current sharing unit 13, and the output of the second amplifier is connected to the power supply unit 11. In this embodiment, the output of the second amplifier can be added to the reference voltage as a negative feedback signal. The second amplifier is used to receive the reference voltage output by the current sharing unit 13 and the first sampled voltage output by the amplification subunit 122. After error amplification of the first sampled voltage, a first feedback signal is output to the power supply unit 11 to facilitate subsequent adjustment of the output voltage, thereby adjusting the output current of the power supply module 10 to achieve the purpose of balancing the output current of each power supply module 10.

[0059] Please refer to Figure 5. In one embodiment, the first and second amplifiers can be integrated to form a dual operational amplifier U1, such as the LM358. Correspondingly, the 2IN+ signal terminal of the dual operational amplifier corresponds to the non-inverting input terminal of the first amplifier, the 2OUT signal terminal corresponds to the output terminal of the first amplifier, and the 2IN- signal terminal corresponds to the inverting input terminal of the first amplifier. Similarly, the 1IN+ signal terminal of the dual operational amplifier corresponds to the non-inverting input terminal of the second amplifier, the 1IN- signal terminal corresponds to the inverting input terminal of the second amplifier, and the 1OUT signal terminal corresponds to the output terminal of the second amplifier.

[0060] In one embodiment, the feedback unit 14 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a capacitor C1, and a diode D1. One end of the third resistor R3 is connected to the output terminal of the current sharing unit 13 and the current limiting unit 15. The other end of the third resistor R3, one end of the capacitor C1, and one end of the fourth resistor R4 are all connected to the inverting input terminal of the second amplifier. The other end of the capacitor C1 is connected to the output terminal of the second amplifier through the sixth resistor R6. The other end of the fourth resistor R4, one end of the fifth resistor R5, and the positive terminal of the diode D1 are all connected to the output terminal of the second amplifier. The other end of the fifth resistor R5 is connected to the feedback subunit 112, and the negative terminal of the diode D1 is connected to the feedback subunit 112. In this embodiment, the reference voltage output by the current sharing unit 13 and the output signal of the second amplifier are added together by the third resistor R3 and the fourth resistor R4 and then output to the second amplifier, forming negative feedback. The output signal of the second amplifier, i.e., the first feedback signal, is output to the feedback subunit 112 through the fifth resistor R5. The amplification factor of the second amplifier can be determined by the third resistor R3 and the fourth resistor R4. That is, the amplification factor of the second amplifier can be (R3+R4) / R3, where R3 and R4 are the resistance values ​​of the third resistor R3 and the fourth resistor R4, respectively.

[0061] In one embodiment, the current sharing unit 13 includes a second resistor R2. One end of the second resistor R2 is connected to the output terminal of the current sampling unit 12, and the other end of the second resistor R2 is connected to the output terminals of the current sharing units 13 in other power modules 10. That is, the first sampling voltage output by the amplification subunit 122 in this embodiment is connected in parallel with other power modules 10 through the second resistor R2 to obtain the average current of each power module 10, which serves as the reference voltage for the second amplifier, so as to amplify the error between the output current of the corresponding power module 10 and the average current. In this embodiment, the connection with other power modules 10 is achieved by setting only one resistor, which simplifies the circuit structure, reduces the space occupied by the power supply circuit structure, facilitates miniaturization, and meets the requirements of lightweight and thin design of electrical equipment.

[0062] As one embodiment, the current limiting unit 15 includes a Zener diode ZD1, with its anode grounded and its cathode connected to the feedback terminal of the feedback unit 14. When the Zener diode ZD1 is not conducting, the amplification factor of the second amplifier is 1. When the output current of the power module 10, i.e., the current flowing through the second resistor R2, reaches the set upper limit, causing the Zener diode ZD1 to conduct, the amplification factor of the second amplifier becomes (R3+R4) / R3. At this time, the voltage corresponding to the output signal of the second amplifier rises rapidly, and the diode D1 conducts, thereby causing the supply voltage to drop rapidly, limiting the continued rise of the output current of the power module 10, thus achieving the purpose of current limiting.

[0063] As one embodiment, the feedback subunit 112 includes a first voltage divider resistor R01, a second voltage divider resistor R02, a third voltage divider resistor R03, and a voltage regulator U2. One end of the first voltage divider resistor R01 is connected to the output terminal of the power supply subunit 111, and the other end of the first voltage divider resistor R01 is connected to one end of the second voltage divider resistor R02. The other end of the second voltage divider resistor R02 is connected to one end of the third voltage divider resistor R03 and the first terminal of the voltage regulator U2. The other end of the third voltage divider resistor R03 is grounded. The first terminal of the voltage regulator U2 is also connected to the output terminal of the feedback unit 14, the second terminal of the voltage regulator U2 is grounded, and the third terminal of the voltage regulator U2 is connected to the feedback terminal of the power supply subunit 111.

[0064] The first voltage divider resistor R01, the second voltage divider resistor R02, and the third voltage divider resistor R03 form a voltage sampling section, which samples the output voltage of the power supply module 10, i.e., the supply voltage, to obtain the second sampled voltage. The reference voltage output by the current sharing unit 13 and the output signal of the second amplifier are added together through the third resistor R3 and the fourth resistor R4 and then output to the second amplifier to form negative feedback. The output signal of the second amplifier, i.e., the first feedback signal, is added together with the second sampled voltage through the fifth resistor R5 and then output to the voltage regulator U2. The voltage regulator U2 amplifies the error between the voltage regulator U2 and the internal reference voltage and outputs the second feedback signal to the power supply subunit 111 to facilitate the regulation of the supply voltage.

[0065] In some embodiments, the power module 10 further includes an undervoltage detection unit, which is disposed at the output terminal of the power unit 11. The undervoltage detection unit is used to provide undervoltage protection for the power unit 11. When a fault occurs in the load 20 and triggers power current limiting, the output voltage of the power unit 11 drops. After detecting undervoltage, protection is implemented to improve the reliability of the power supply circuit. It should be noted that since the circuit structure corresponding to the undervoltage detection unit is a known structure, the specific circuit structure of the undervoltage detection unit will not be described in detail.

[0066] This application embodiment also provides a power supply device, which includes the aforementioned power supply circuit. The power supply circuit includes multiple power modules, each connected in parallel with the other power modules through a current sharing unit. The power units within each power module collectively supply power to the load, effectively allowing multiple power modules to supply power to the same load in parallel. This increases the power supply power of the power supply circuit, thereby meeting the load's high-power requirements. Since the power supply circuit has been described in detail above, it will not be repeated here.

[0067] This application embodiment also provides an electrical device that integrates the aforementioned power supply circuit. This power supply circuit includes multiple power modules, each connected in parallel with the other power modules via a current sharing unit. The power units within each power module collectively supply power to the load, effectively allowing multiple power modules to supply power to the same load. This increases the power supply capacity of the circuit and meets the high-power demands of the load. The current sharing unit, feedback unit, and current sampling unit in this power supply circuit are implemented using simple components such as resistors and amplifiers, simplifying the circuit structure. This simplifies the circuit structure while meeting high-power supply requirements, reducing the space occupied by the power supply circuit and facilitating the design of a thinner and lighter electrical device. Since the power supply circuit has been described in detail above, it will not be repeated here.

[0068] In some embodiments, the electrical equipment in this embodiment includes a display device such as a television. The power supply circuit described above is provided in the television to ensure the television's thin and light design while meeting the high power supply requirements of the television.

[0069] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0070] The power supply circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply circuit, wherein, The power supply circuit includes multiple power modules, each power module comprising: A power supply unit, the output of which is used to connect to a load; A current sampling unit, the input terminal of which is connected to the load; A current sharing unit is provided, the input of which is connected to the output of the current sampling unit, and the output of which is connected to the output of the current sharing units in the other power modules. The current sharing unit is used to output a reference voltage based on the average current of the multiple power modules. The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal.

2. The power supply circuit of claim 1, wherein, The output current of multiple power modules is equal.

3. The power supply circuit of claim 2, wherein, The current sampling unit includes a sampling subunit and an amplification subunit. The input terminal of the sampling subunit is connected to the load, and the input terminal of the amplification subunit is connected to the input terminal of the sampling subunit. The sampling subunit is used to output a first sampling voltage based on the current flowing through the load in the power module; the amplification subunit is used to amplify the first sampling voltage.

4. The power supply circuit of claim 3, wherein, The sampling subunit includes a first resistor, one end of which is connected to the load, and the other end of which is grounded.

5. The power supply circuit of claim 3, wherein, The amplification subunit includes a first amplifier, the non-inverting input terminal of the first amplifier is connected to the input terminal of the sampling subunit, the inverting input terminal of the first amplifier is grounded, and the output terminal of the first amplifier is connected to the feedback unit and the current sharing unit.

6. The power supply circuit of claim 5, wherein, The feedback unit includes a second amplifier, the non-inverting input of which is connected to the amplification subunit, the inverting input of which is connected to the output of the current sharing unit, and the output of which is connected to the power supply unit.

7. The power supply circuit of claim 6, wherein, The first amplifier and the second amplifier are integrated.

8. The power supply circuit of claim 1, wherein, The current sharing unit includes a second resistor, one end of which is connected to the output terminal of the current sampling unit, and the other end of which is connected to the output terminal of the current sharing unit in other power modules.

9. The power supply circuit of claim 1, wherein, The power module further includes a current limiting unit, which is connected to the second input terminal of the feedback unit; the current limiting unit is used to limit the output current of the power module.

10. The power supply circuit of claim 9, wherein, The current limiting unit includes a Zener diode, the positive terminal of which is grounded, and the negative terminal of which is connected to the second input terminal of the feedback unit.

11. The power supply circuit of claim 1, wherein, The power supply unit includes a power supply subunit and a feedback subunit. The output terminal of the power supply subunit is used to connect to the load and provide a corresponding power supply voltage to the load. The input terminal of the feedback subunit is connected to the output terminals of the feedback unit and the power supply subunit, and the output terminal of the feedback subunit is connected to the feedback terminal of the power supply subunit. The feedback subunit is used to sample the power supply voltage to obtain a second sampled voltage, and output a second feedback signal to the power supply subunit according to the first feedback signal and the second sampled voltage, so that the power supply subunit adjusts the power supply voltage according to the second feedback signal.

12. The power supply circuit of claim 11, wherein, The feedback subunit includes a first voltage divider resistor, a second voltage divider resistor, a third voltage divider resistor, and a voltage regulator. One end of the first voltage divider resistor is connected to the output terminal of the power supply subunit. The other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor. The other end of the second voltage divider resistor is connected to one end of the third voltage divider resistor and the first terminal of the voltage regulator. The other end of the third voltage divider resistor is grounded. The first terminal of the voltage regulator is also connected to the output terminal of the feedback unit. The second terminal of the voltage regulator is grounded. The third terminal of the voltage regulator is connected to the feedback terminal of the power supply subunit.

13. A power supply device, wherein, The power supply device includes a power supply circuit; The power supply circuit includes multiple power modules, each power module including: a power unit, the output terminal of which is used to connect to the load; A current sampling unit, the input terminal of which is connected to the load; A current sharing unit is provided, the input of which is connected to the output of the current sampling unit, and the output of which is connected to the output of the current sharing units in the other power modules. The current sharing unit is used to output a reference voltage based on the average current of the multiple power modules. The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal.

14. The power supply device of claim 13, wherein, The output current of multiple power modules is equal.

15. The power supply device of claim 14, wherein, The current sampling unit includes a sampling subunit and an amplification subunit. The input terminal of the sampling subunit is connected to the load, and the input terminal of the amplification subunit is connected to the input terminal of the sampling subunit. The sampling subunit is used to output a first sampling voltage based on the current flowing through the load in the power module; the amplification subunit is used to amplify the first sampling voltage.

16. The power supply device of claim 15, wherein, The sampling subunit includes a first resistor, one end of which is connected to the load, and the other end of which is grounded.

17. The power supply device of claim 15, wherein, The amplification subunit includes a first amplifier, the non-inverting input terminal of the first amplifier is connected to the input terminal of the sampling subunit, the inverting input terminal of the first amplifier is grounded, and the output terminal of the first amplifier is connected to the feedback unit and the current sharing unit.

18. The power supply device of claim 17, wherein, The feedback unit includes a second amplifier, the non-inverting input of which is connected to the amplification subunit, the inverting input of which is connected to the output of the current sharing unit, and the output of which is connected to the power supply unit.

19. The power supply device of claim 18, wherein, The first amplifier and the second amplifier are integrated.

20. An electrical device, comprising: The electrical equipment includes a power supply circuit; The power supply circuit includes multiple power modules, each power module including: a power unit, the output terminal of which is used to connect to the load; A current sampling unit, the input terminal of which is connected to the load; A current sharing unit is provided, the input of which is connected to the output of the current sampling unit, and the output of which is connected to the output of the current sharing units in the other power modules. The current sharing unit is used to output a reference voltage based on the average current of the multiple power modules. The feedback unit has a first input terminal connected to the output terminal of the current sampling unit, an output terminal connected to the feedback terminal of the power supply unit, and a second input terminal connected to the output terminal of the current sharing unit. The feedback unit is used to output a first feedback signal to the power supply unit based on the reference voltage and the first sampling voltage output by the current sampling unit, so that the power supply unit adjusts the output supply voltage according to the first feedback signal.

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