Power equalization device

Abstract

The utility model provides a kind of power management device, including multiple power management module, prevent backflow circuit, current detection circuit, current sharing control unit and voltage adjustment unit.The analog voltage output of the correction voltage conversion of current sharing control unit output is output to each power management module, to adjust the direct current voltage of power management module output, and then realize the purpose of current sharing, so, by the cooperation of prevent backflow circuit, current detection circuit, current sharing control unit and voltage adjustment unit, accurate current automatic equalization and fault isolation can be realized, avoid the problem of uneven current and reverse backflow.

Description

Technical Field

[0001] This utility model relates to the field of power management technology, and in particular to a power current sharing device. Background Technology

[0002] While existing PMIC chips can provide multiple voltage and PWM control signals, the output power of a single chip is typically limited, making it difficult to meet the demands of high-power loads. To achieve higher power output, multiple chips are often connected in parallel. However, existing technologies have significant problems: First, when multiple chips are directly connected in parallel, slight deviations in the output voltage of each chip can lead to severely uneven current distribution, potentially overloading some chips while leaving others lightly loaded, reducing system reliability. Second, there is a risk of reverse current sinking, meaning a faulty chip may draw current from the bus and be damaged. Third, if an external current sharing control loop is introduced, its bandwidth may overlap with the inherent high-bandwidth voltage loop within the PMIC, causing control loop interference and oscillations, leading to system instability. Furthermore, there are issues such as uneven heat dissipation and maintenance difficulties.

[0003] Therefore, there is an urgent need in this field for a new power supply structure that can enable multiple PMIC chips to work in parallel without modifying the internal circuitry of the PMIC, and can safely and stably expand the output power while also being modular, highly reliable, and easy to maintain. Utility Model Content

[0004] This invention provides a power sharing device that enables multiple PMIC chips to work in parallel without modifying the internal circuitry of the PMIC, and safely and stably expands the output power. It also features modularity, high reliability, and ease of maintenance.

[0005] To solve the above-mentioned technical problems, this utility model provides a power sharing device, which includes:

[0006] Multiple power management modules connected in parallel, wherein the input terminal of each power management module is connected to a regulated power supply, and the output terminal of each power management module outputs an adjustable DC voltage obtained from the regulated power supply;

[0007] Anti-backflow circuit: Each power management module output terminal is connected in series with an anti-backflow circuit, and the anti-backflow circuit is connected to the load.

[0008] A current detection circuit is provided on each branch between the anti-backflow circuit and the load to collect the current on the branch between the anti-backflow circuit and the load.

[0009] A current sharing control unit, the input terminal of which is connected to all the current detection circuits, outputs a correction voltage based on the deviation between the current collected by all the current detection circuits and the target current for current sharing;

[0010] A voltage adjustment unit is connected to the output terminal of the current sharing control unit to obtain the correction voltage. The voltage adjustment unit converts the correction voltage into an analog voltage, amplifies the analog voltage, and feeds it back to each of the power management modules.

[0011] Optionally, the power management module is a separate, pluggable integrated circuit board.

[0012] Optionally, the anti-backflow circuit includes a MOSFET and a first operational amplifier. The first end of the MOSFET is connected to the output of the power management module, the second end of the MOSFET is connected to the inverting input of the first operational amplifier, the non-inverting input of the first operational amplifier is connected to the output of the power management module, and the output of the first operational amplifier is connected to the gate of the MOSFET.

[0013] Optionally, the MOS transistor is an NMOS transistor, with its source connected to the output terminal of the power management module and its drain connected to the inverting input terminal of the first operational amplifier.

[0014] Optionally, the current detection circuit includes a sampling resistor and a differential amplifier. The sampling resistor is connected in series in the branch between the backflow prevention circuit and the load. The non-inverting input and the inverting input of the differential amplifier are respectively connected to the two ends of the sampling resistor. The output of the differential amplifier is connected to the input of the current sharing control unit.

[0015] Optionally, the current sharing control unit obtains the target current for current sharing based on the average value of the currents collected by all the current detection circuits.

[0016] Optionally, the current sharing control unit performs proportional-integral calculations on the deviation between the current collected by each of the current detection circuits and the target current for current sharing, thereby obtaining the correction voltage.

[0017] Optionally, the voltage adjustment unit includes a DAC conversion circuit and a signal amplification circuit. The input terminal of the DAC conversion circuit is connected to the output terminal of the current sharing control unit, and the output terminal of the DAC conversion circuit is connected to the signal amplification circuit. The signal amplification circuit is connected to the power management module.

[0018] Optionally, the signal amplification circuit includes a second operational amplifier and an injection resistor. The input terminal of the second operational amplifier is connected to the output terminal of the DAC conversion circuit, and the output terminal of the second operational amplifier is connected to the power management module through the injection resistor.

[0019] The power sharing device described above has at least the following technical advantages:

[0020] 1. Without changing the internal design of the power management module, the output power can be linearly extended to hundreds of watts or even kilowatts by connecting multiple power management modules in parallel;

[0021] 2. The analog voltage obtained by the correction voltage conversion is output to each power management module, thereby adjusting the DC voltage output by the power management module and achieving the purpose of current sharing. In this way, through the cooperation of the anti-backflow circuit, the current detection circuit, the current sharing control unit and the voltage adjustment unit, accurate automatic current balancing and fault isolation can be achieved, avoiding the problems of uneven current and reverse backflow.

[0022] 3. The current sharing control unit forms an external, low-bandwidth current sharing control loop, while the internal voltage regulator of each power management module forms an internal, high-bandwidth voltage control loop. The bandwidth of the external current sharing loop is set much lower than that of the internal voltage loop. This "low-bandwidth outer loop enclosing a high-bandwidth inner loop" structure ensures that the external current sharing adjustment is dynamic and slow, without interfering with the fast response of the internal voltage loop. This fundamentally avoids the oscillation risk of the dual-loop system and guarantees global stability. Attached Figure Description

[0023] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0024] Figure 1 This is a schematic diagram of a power sharing device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the circuits of each part of the power sharing device according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, advantages, and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the objectives of the embodiments of this utility model. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different drawings may emphasize different aspects and sometimes use different scales.

[0027] As used in this invention, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to include the meaning of “and / or”; the term “a number” is generally used to include the meaning of “at least one”; and the term “at least two” is generally used to include the meaning of “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature. “One end” and “the other end,” as well as “proximal end” and “far end,” generally refer to two corresponding parts, including not only endpoints. The terms “installed,” “connected,” and “joined” 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements or the interaction between two elements. Furthermore, as used in this invention, the phrase "one element is disposed on another element" generally only indicates that there is a connection, coupling, cooperation, or transmission relationship between the two elements. This connection, coupling, cooperation, or transmission can be direct or indirect through an intermediate element, and should not be construed as indicating or implying a spatial positional relationship between the two elements. That is, one element can be located arbitrarily inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] See Figure 1This utility model provides a power sharing device, including multiple power management modules 10 connected in parallel, an anti-backflow circuit 20, a current detection circuit 30, a current sharing control unit 40, and a voltage adjustment unit 50. The input terminal of each power management module 10 is connected to a regulated power supply, and the output terminal of each power management module 10 outputs an adjustable DC voltage obtained from the regulated power supply. In one embodiment, the power management module 10 can be a PMIC (Power Management IC). A PMIC is an integrated circuit used for power management of electronic devices, whose main functions include voltage conversion, current control, power monitoring, and energy optimization. It is widely used in smartphones, automotive electronics, industrial control, and other fields. PMICs integrate modules such as DC / DC converters and LDO regulators to achieve multi-power management, supporting dynamic voltage regulation and power consumption optimization. An anti-backflow circuit 20 is connected in series at the output terminal of each power management module. The anti-backflow circuit 20 is connected to a load 60, and the anti-backflow circuit 20 can prevent reverse backflow to the power management module 10. A current detection circuit 30 is installed on each branch between the anti-backflow circuit 20 and the load 60. The current detection circuit 30 is used to collect the current on the branch between the anti-backflow circuit 20 and the load 60. The input terminal of the current sharing control unit 40 is connected to all current detection circuits 30 to obtain the current collected by each current detection circuit 30. The current sharing control unit 40 outputs a correction voltage based on the deviation between the current collected by all current detection circuits 30 and the preset current sharing target current. The voltage adjustment unit 50 is connected to the output terminal of the current sharing control unit 40 to obtain the correction voltage. The voltage adjustment unit 50 converts the correction voltage into an analog voltage, amplifies the analog voltage, and feeds it back to each power management module 10. This allows each power management module 10 to adjust its output DC voltage according to the correction voltage, ensuring that the current output of the device is balanced, that is, ensuring that the current value collected by each current detection circuit 30 converges to the current value of the current sharing target current. Thus, this invention can linearly extend the output power to hundreds of watts or even kilowatts by connecting multiple power management modules 10 in parallel without changing the internal design of the power management module 10. The analog voltage obtained by the correction voltage conversion is output to each power management module 10, thereby adjusting the DC voltage output by the power management module 10 and achieving current sharing. In this way, through the cooperation of the anti-backflow circuit 20, the current detection circuit 30, the current sharing control unit 40 and the voltage adjustment unit 50, accurate automatic current balancing and fault isolation can be achieved, avoiding the problems of uneven current and reverse backflow. The current sharing control unit 40 constitutes an external, low-bandwidth current sharing control loop, while the internal voltage regulator of each power management module 10 constitutes an internal, high-bandwidth voltage control loop.The bandwidth of the external current sharing loop is set to be much lower than that of the internal voltage loop. This "low-bandwidth outer loop enclosing high-bandwidth inner loop" structure ensures that the external current sharing adjustment is dynamic and slow, and will not interfere with the fast response of the internal voltage loop. This fundamentally avoids the oscillation risk of the dual-loop system and ensures global stability.

[0029] In one embodiment, the power management module 10 is an independent, pluggable integrated circuit board, which facilitates replacement and maintenance.

[0030] In one embodiment, the anti-backflow circuit 20 includes a MOSFET Q and a first operational amplifier U1. The first end of the MOSFET Q is connected to the output of the power management module 10, the second end of the MOSFET Q is connected to the inverting input of the first operational amplifier U1, the non-inverting input of the first operational amplifier U1 is connected to the output of the power management module 10, and the output of the first operational amplifier is connected to the gate of the MOSFET Q.

[0031] For example, MOS transistor Q is an NMOS transistor, the source of which is connected to the output of power management module 10, and the drain of which is connected to the inverting input of first operational amplifier U1.

[0032] For example, the current detection circuit includes a sampling resistor R1 and a differential amplifier U3 with a high common-mode rejection ratio. The sampling resistor R1 is connected in series in the branch between the anti-backflow circuit 20 and the load 60. The non-inverting input and the inverting input of the differential amplifier U3 are respectively connected to the two ends of the sampling resistor R1. The output of the differential amplifier U3 is connected to the input of the current sharing control unit 40.

[0033] In one embodiment, the current sharing target current can be set by the current sharing control unit 40 obtaining the current sharing target current based on the average value of the currents collected by all current detection circuits 30, that is, using the average value of the currents collected by all current detection circuits 30 as the current sharing target current.

[0034] In one embodiment, the current sharing control unit 40 performs proportional-integral (PI) calculations on the deviations between the currents collected by each current detection circuit 30 and the target current for current sharing, thereby obtaining a correction voltage. It is understood that proportional-integral (PI) control is a linear control method that generates control quantities through a combination of proportional and integral operations. Its output signal is composed of the linear superposition of the proportional and integral terms of the input deviation. The control algorithm expression is c(t) = Kp × deviation + Ki × ∫ deviation dt, where Kp is the proportional coefficient adjusting the response intensity, and Ki is the integral constant affecting the error elimination speed. Substituting this into this embodiment, the deviation in the formula is the deviation between the current collected by the current detection circuit and the target current for current sharing, and c(t) is the output correction voltage.

[0035] In one embodiment, regarding the structural configuration of the voltage adjustment unit 50, the voltage adjustment unit 50 includes a DAC conversion circuit 51 and a signal amplification circuit. The input terminal of the DAC conversion circuit 51 is connected to the output terminal of the current sharing control unit 40, and the output terminal of the DAC conversion circuit 51 is connected to the signal amplification circuit, which is connected to the power management module 10. The DAC conversion circuit 51 converts the correction voltage into an analog voltage, and the signal amplification circuit amplifies the analog voltage and outputs it to the power management module 10.

[0036] Furthermore, the signal amplification circuit includes a second operational amplifier U2 and an injection resistor R2. The input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC conversion circuit 51, and the output terminal of the second operational amplifier U2 is connected to the power management module 10 through the injection resistor R2.

[0037] The power sharing device of this utility model also includes an output filter capacitor, a decoupling capacitor, an ESD / surge protection device, etc., which can be adapted by those skilled in the art and will not be described in detail here.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A power sharing device, characterized in that, include: Multiple power management modules are connected in parallel. The input terminal of each power management module is connected to a regulated power supply, and the output terminal of each power management module outputs an adjustable DC voltage obtained from the regulated power supply. Anti-backflow circuit: Each power management module output terminal is connected in series with an anti-backflow circuit, and the anti-backflow circuit is connected to the load. A current detection circuit is provided on each branch between the anti-backflow circuit and the load to collect the current on the branch between the anti-backflow circuit and the load. A current sharing control unit, the input terminal of which is connected to all the current detection circuits, outputs a correction voltage based on the deviation between the current collected by all the current detection circuits and the target current for current sharing; A voltage adjustment unit is connected to the output terminal of the current sharing control unit to obtain the correction voltage. The voltage adjustment unit converts the correction voltage into an analog voltage, amplifies the analog voltage, and feeds it back to each of the power management modules.

2. The power sharing device according to claim 1, characterized in that, The power management module is a separate, pluggable integrated circuit board.

3. The power sharing device according to claim 1, characterized in that, The backflow prevention circuit includes a MOSFET and a first operational amplifier. The first end of the MOSFET is connected to the output of the power management module, the second end of the MOSFET is connected to the inverting input of the first operational amplifier, the non-inverting input of the first operational amplifier is connected to the output of the power management module, and the output of the first operational amplifier is connected to the gate of the MOSFET.

4. The power sharing device according to claim 3, characterized in that, The MOS transistor is an NMOS transistor, with its source connected to the output terminal of the power management module and its drain connected to the inverting input terminal of the first operational amplifier.

5. The power sharing device according to claim 1, characterized in that, The current detection circuit includes a sampling resistor and a differential amplifier. The sampling resistor is connected in series in the branch between the backflow prevention circuit and the load. The non-inverting input and the inverting input of the differential amplifier are respectively connected to the two ends of the sampling resistor. The output of the differential amplifier is connected to the input of the current sharing control unit.

6. The power sharing device according to claim 1, characterized in that, The current sharing control unit obtains the target current for current sharing based on the average value of the currents collected by all the current detection circuits.

7. The power sharing device according to claim 1, characterized in that, The current sharing control unit performs proportional-integral calculations on the deviation between the current collected by each current detection circuit and the target current for current sharing, thereby obtaining the correction voltage.

8. The power sharing device according to claim 1, characterized in that, The voltage adjustment unit includes a DAC conversion circuit and a signal amplification circuit. The input terminal of the DAC conversion circuit is connected to the output terminal of the current sharing control unit, and the output terminal of the DAC conversion circuit is connected to the signal amplification circuit. The signal amplification circuit is connected to the power management module.

9. The power sharing device according to claim 8, characterized in that, The signal amplification circuit includes a second operational amplifier and an injection resistor. The input terminal of the second operational amplifier is connected to the output terminal of the DAC conversion circuit, and the output terminal of the second operational amplifier is connected to the power management module through the injection resistor.

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