TWI798918B - Power supply unit and power supply system with dynamic current sharing - Google Patents

Abstract

A power supply system with dynamic current sharing includes a current-sharing bus and a plurality of power supply units connected to each other through the current-sharing bus. The current-sharing bus provides a first current signal. Each power supply unit includes a local current bus for providing a second current signal. A control processor of each power supply unit includes an active current-sharing unit, a current-averaging unit, a droop current unit, and an integrated calculation unit. The active current-sharing unit receives the first current signal and the second current signal, and compares the first current signal with the second current signal to generate a compensation voltage. The current-averaging unit receives the first current signal and the second current signal, and compares a difference value between an average value of the first current signal and an average value of the second current signal to generate an average voltage. The droop current unit receives the second current signal to generate a droop compensation voltage. The integrated calculation unit receives the compensation voltage, the average voltage, and the droop compensation voltage, and makes output currents of the power supply units be approximately equal according to the compensation voltage, the average voltage, and the droop compensation voltage.

Description

Power supply unit and power supply system with dynamic current sharing

The present invention relates to a power supply unit and a power supply system with dynamic current sharing, especially a power supply system with continuous dynamic load current control.

With the development of the Internet and the increasing demand for computing, the functions and performance of the central processing unit (CPU) and graphics processing unit (GPU), which act as the basic computing engines, are becoming more and more powerful, resulting in more and more dynamic load changes in the system. Therefore, the dynamic load current sharing performance of the power supply becomes more and more important.

As shown in FIG. 1 , it is a schematic diagram of a dynamic load test waveform for a graphics processor. Therefore, it can be seen from the continuous dynamic load waveform (ie EDPP, electric data peak processing) shown in Figure 1 that the peak load (or peak load) can reach a maximum of 200% of the rated load, and the duration lasts for Less than 200us (that is, the time length of T1). At T2 (less than 1ms), it is 150% of the rated load. In this way, the dynamic load state descends sequentially.

For the power supply unit (or power supply unit, PSU) connected in parallel, when the above-mentioned EDPP is used for load testing, if only the general current sharing technology is used, the output current of the power supply unit is prone to uneven flow. Phenomenon.

For example, multiple power supply units can be connected to the system load by connecting their outputs to jointly supply power to the system load. If only the general active current sharing technology is used, it uses a current-sharing bus (current-sharing bus) to connect multiple power supply units, and passes the signal on the current-sharing bus and the current inside the power supply The detection signal is subtracted to lower the output current The power supply increases its output voltage to achieve the purpose of current sharing. This method can achieve accurate current sharing performance under stable loads; however, its disadvantage is that it cannot provide instant load response for continuous dynamic load conditions.

Specifically, the implementation of active current sharing is to compare the current signal (I _{SHARE_BUS} ) of the current sharing bus with the current signal (I _{LOCAL_BUS} ) of each power supply unit (current subtraction), wherein the current signal of the current sharing bus is is the maximum output current of these multiple power supply units (or a current signal proportional to the maximum output current). Therefore, by comparing the two currents, the output current of each power supply unit and the maximum output of all power supply units can be known. Current gap (ie I _{SHARE_BUS} -I _{LOCAL_BUS} ). And, the error amount (i.e. the current difference) after the subtraction of the two currents generates a voltage increment through a controller (such as, but not limited to, a PI (proportional-integral) controller), and then provides the voltage increment to the reference Voltage, that is, the output current of the power supply unit with the smaller output current can be pulled up to achieve the effect of current sharing. Under continuous dynamic load operation, I _{SHARE_BUS} and I _{LOCAL_BUS} will vary with the load, which is limited by the signal response speed and the bandwidth of the controller. When the load changes more violently, the speed of voltage compensation will not be able to catch up with the load. changes, resulting in poor dynamic current sharing performance.

In addition, another general current sharing technology is called step-down (droop) current sharing technology. For the step-down current sharing technology, it is not necessary to connect all the power supply units with the current sharing bus provided by the active current sharing, but only need to use the internal current signal of each power supply unit. The principle is that the power supply The output voltage of the unit will decrease as the load increases, as shown in FIG. 6A. In this way, through the step-down current sharing technology, the output voltage can be naturally changed in response to changes in the load, thereby achieving the purpose of current sharing. Usually, the realized circuit is through the use of an operational amplifier (OPA) and a current sensing resistor. The differential amplifier circuit composed of the operational amplifier amplifies the voltage difference generated by the load current passing through the current sensing resistor, and then amplifies this The signal is added to the voltage feedback circuit, that is, when the load current increases, the output voltage is adjusted down; when the load current decreases, the output voltage is increased.

Generally speaking, the step-down current sharing technology is mostly used in power over Ethernet (PoE) systems. Due to the output voltage of the power supply device (that is, the power supply unit) of the Ethernet power supply system Higher (generally 54V), the variable range of the voltage is larger. Therefore, the purpose of current sharing can be achieved through a simple step-down current sharing structure. However, its disadvantage is that in order to achieve a high-accuracy (precision) current sharing effect, the step-down (droop) slope must be large. At this time, the load regulation (load regulation) of the output voltage will be sacrificed; and the drop-down slope accuracy must be high. The design requirements are more stringent. In other words, it is relatively difficult to use a droop slope design to achieve good current sharing effect and load regulation at the same time.

Therefore, how to design a power supply unit and a power supply system with dynamic current sharing to solve the problems and technical bottlenecks in the prior art is an important subject studied by the inventor of the present invention.

An object of the present invention is to provide a power supply unit to solve the problems of the prior art.

In order to achieve the purpose disclosed above, the power supply unit proposed by the present invention includes a power converter, a current detection circuit, a detection signal peripheral circuit and a control processor. The power converter provides output current and output voltage. The current detection circuit detects the output current and provides a current signal corresponding to the magnitude of the output current. The detection signal peripheral circuit receives the output voltage, the current signal and the current sharing bus signal, and respectively converts the output voltage, the current sharing bus signal and the current signal into an output voltage signal, a first current signal and a second current signal. The control processor receives the output voltage signal, the first current signal, and the second current signal, and performs active current sharing control, average current error compensation control, and step-down equalization according to the output voltage signal, the first current signal, and the second current signal. Flow control to generate a control signal to control the output voltage to adjust the magnitude of the output current.

With the proposed power supply unit, through the integration of active current sharing control, step-down current sharing control and average current error compensation control, combining the advantages of each current sharing control, it can achieve continuous fast dynamic load and improve the speed of voltage compensation And improve the accuracy of current sharing, so that the output currents of the parallel-connected power supply units under dynamic loads are roughly equal, so as to achieve the optimal current sharing effect.

Another object of the present invention is to provide a power supply system with dynamic current sharing to solve the problems of the prior art.

In order to achieve the purpose disclosed above, the power supply system with dynamic current sharing proposed by the present invention includes a current sharing busbar and multiple power supply units. The current sharing bus bar provides the first current signal. The power supply units are connected to each other through a current sharing bus. Each of the power supply units has its own current bus to provide the second current signal. The control processor of each power supply unit includes an active current sharing unit, an average current unit, a step-down current unit and an integrated computing unit. The active current sharing unit receives the first current signal and the second current signal, and compares the second current signal with the first current signal to generate a compensation voltage. The average current unit receives the first current signal and the second current signal, and compares the difference between the average value of the first current signal and the average value of the second current signal to generate an average voltage. The step-down current unit receives the second current signal to generate a step-down compensation voltage. The integrated calculation unit receives the compensation voltage, the average voltage and the buck compensation voltage, and makes the output current of the power supply unit roughly equal according to the compensation voltage, the average voltage and the buck compensation voltage.

With the proposed power supply system with dynamic current sharing, through the integration of active current sharing control, step-down current sharing control and average current error compensation control, combining the advantages of each current sharing control, it can achieve continuous fast dynamic load In this way, the speed of voltage compensation and the accuracy of current sharing are improved, so that the output currents of the power supply units connected in parallel are roughly equal under dynamic loads, and the optimal current sharing effect is achieved.

In order to further understand the technology, means and effects that the present invention adopts to achieve the predetermined purpose, please refer to the following detailed description and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention can be obtained from this in depth and For specific understanding, however, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

PSU ₁ -PSU _N : Power supply unit

101: Current detection circuit

102: Detection signal peripheral circuit

103, 103 ₁ -103 _N : digital control processor

104: Current sharing bus signal peripheral circuit

105: Switch drive circuit

106: switch switching power converter

11: Active current sharing unit

12: Average current unit

13: Buck current unit

14: Integrated Computing Unit

15: Control signal generation unit

111: Voltage comparison unit

112: Compensation unit

121: the first average current calculation unit

122: the second average current calculation unit

123: Average current difference calculation unit

131: Buck function calculation unit

151: output voltage comparison unit

152: Control signal generation unit

V _OUT : output voltage

I _OUT : output current

V _{ILOCAL_1} : current signal

V _{OUT_SENSE} : output voltage signal

I _SHARE : current sharing signal

PWM,PWM ₁ -PWM _N : Control signal

I _SB : current sharing bus

I _LB1 -I _LBN : own current bus

S _I1 : the first current signal

S _I21 -S _I2N : Second current signal

S _I1AVG : first current average value

S _I21AVG -S _I2NAVG : Second current average value

V _COMP1 -V _COMPN : Compensation voltage

V _AVG1 -V _AVGN : average voltage

V _DROOP1 -V _DROOPN : Buck compensation voltage

V _{OUT_SENSE1} -V _{OUT_SENSEN} : output voltage

V _{OUT_REF1} -V _{OUT_REFN} : Reference voltage

PWM ₁ -PWM _N : Control signal

Figure 1: It is a schematic diagram of a dynamic load test waveform for a graphics processor.

Fig. 2 is a circuit block diagram of a single power supply unit of the power supply system of the present invention.

Fig. 3 is a schematic block diagram of multiple power supply units used in parallel in the power supply system of the present invention.

FIG. 4 is a circuit block diagram of the control processor of the power supply system of the present invention performing dynamic current sharing.

Fig. 5 is a detailed circuit block diagram of the control processor of the power supply unit of the present invention.

FIG. 6A is a waveform diagram designed for the slope of the load current and the output voltage used in the traditional step-down current sharing.

FIG. 6B is a waveform diagram designed for the slope of the load current and the voltage drop compensation voltage used in the step-down current sharing method of the present invention.

Hereby, the technical content and detailed description of the present invention are described as follows in conjunction with the drawings.

The power supply system with dynamic current sharing disclosed by the present invention can be applied to, for example but not limited to, power supplies in related fields such as servers (server), network communication (networking), etc., for example, through Multiple power supplies connected in parallel are used as a redundant power supply architecture.

Furthermore, the present invention introduces the existing current sharing technology, including active current sharing control and step-down current sharing control, combined with the average current error compensation control, to obtain the advantages of each current sharing control, to achieve continuous fast dynamic load, Increase the speed of voltage compensation and improve the accuracy of current sharing to achieve the optimal current sharing effect. Hereinafter, the current sharing control of the present invention will be described in detail.

Please refer to FIG. 2 , which is a circuit block diagram of a single power supply unit of the power supply system of the present invention. The single power supply unit (PSU ₁ -PSU _N ) includes a current detection circuit 101, a detection signal peripheral circuit 102, a digital control processor 103, a current sharing bus signal peripheral circuit 104, a switch drive circuit 105 and a switching power converter 106. Refer to Figure 3 for cooperation. When multiple power supply units (power supply units, power supply units) are connected in parallel as a redundant power supply architecture, in this embodiment, two power supply units PSU ₁ -PSU ₂ are used as the example, but not as a limitation. In a parallel system, the output voltage V _OUT of all power supply units PSU ₁ -PSU ₂ is connected in parallel, the first power supply unit PSU ₁ provides output current Iout1, the second power supply unit PSU ₂ provides output current Iout2, and together provide the total The output current Iout_total supplies power to the load of the system. In addition, the power supply units PSU ₁ -PSU ₂ are connected to each other through the current sharing bus _ISB .

Referring again to FIG. 2 , the current detection circuit 101 is used to detect the output current (load current) I _OUT of the power supply unit PSU itself, and provide an amplified current signal V _{ILOCAL_1} . In practice, the current detection circuit 101 can be, for example but not limited to, a resistance element, through which the output current I _OUT flows through the resistance R of the resistor to generate a voltage difference (Vsense=Iout*R), and through the OP formed The differential amplifier circuit can detect the magnitude of the output current I _OUT , which means the amplified current signal V _{ILOCAL_1} .

The detection signal peripheral circuit 102 is used to receive three detection signals, namely the output voltage V _OUT , the current sharing bus signal _ISB , and the amplified current signal V _{ILOCAL_1} (ie corresponding to the output current signal of the power supply unit itself). Further, the detection signal peripheral circuit 102 adjusts the received detection signal (for example: step down), and provides the adjusted detection signal to the digital control processor 103, so as to comply with the digital control processor 103 operable The voltage level (size). That is, after being processed by the detection signal peripheral circuit 102, the output voltage V _OUT is stepped down to V _{OUT_SENSE} , the current signal V _{ILOCAL_1} is stepped down to the second current signal S _I21 -S _I2N , and the current sharing bus signal I _SB is stepped down to the second current signal. A current signal S _I1 .

The digital control processor 103 digitally filters the second current signal S _I2 (that is, its own current detection signal), and after calculation, generates a corresponding current sharing signal I _SHARE to the current sharing bus signal peripheral circuit 104, through which the current sharing bus signal peripheral The circuit 104 amplifies the current sharing signal I _SHARE and provides it to the current sharing bus _ISB connected to the peripheral circuit 104 of the current sharing bus signal. Incidentally, since the current signal on the current sharing bus I _SB is the maximum output current of all power supply units, when all the power supply units provide (transmit) the amplified current sharing signal I _SHARE through the current sharing bus signal peripheral circuit 104 When connected to the current sharing bus _ISB , the current sharing bus _ISB reserves the maximum output current as the current signal _ISB of the current sharing bus.

_The digital control _processor 103 performs active current _sharing control _and the average current error Compensation control and step-down current sharing control generate corresponding reference voltage commands and PWM control signals (described later), and control the switch through the switch drive circuit 105 to switch the output voltage V _OUT of the power converter 106, that is, the output voltage V OUT of the power supply unit The output voltage V _OUT is used to achieve continuous and rapid dynamic load current sharing.

Please refer to FIG. 4 , which is a circuit block diagram of the control processor of the power supply system of the present invention performing dynamic current sharing. With reference to FIG. 3 , the power supply system includes a current sharing bus _ISB and a plurality of power supply units PSU ₁ -PSU _N . The current sharing bus I _SB provides the first current signal S _I1 . These power supply units PSU ₁ -PSU _N are connected to each other through the current sharing bus _ISB . The digital control processors 103 ₁ -103 _N of each power supply unit PSU ₁ -PSU _N include an active current sharing unit 11 , an average current unit 12 , a step-down current unit 13 and an integrated calculation unit 14 . The own current buses I _LB1 -I _LBN correspondingly provide the second current signals S _I21 -S _I2N . That is, the current signal of the output current provided by the self-current bus I _LB1 of the first power supply unit PSU ₁ is the second current signal S _I21 , and the output current provided by the self-current bus I _LB2 of the second power supply unit PSU ₂ The current signal is the second current signal S _I22 . . . The digital control processor 103 receives its own output voltage signals V _{OUT_SENSE1} -V _{OUT_SENSEN} , the first current signal S _I1 and the second current signals S _I21 -S _I2N provided from the detection signal peripheral circuit 102 (shown in FIG. 2 ).

As shown in FIG. 4 , the active current sharing unit 11 of each power supply unit PSU ₁ -PSU _N receives the first current signal S _I1 and the second current signal S _I21 -S _I2N , and compares the second current signal S _I21 -S _I2N and the first current signal S _I1 to generate a compensation voltage V _COMP1 -V _COMPN . Specifically, the first power supply unit _PSU1 receives the first current signal S _I1 provided by the current sharing bus _ISB and the second current signal S _I21 provided by the first current bus I _LB1 . The second power supply unit PSU ₂ receives the first current signal S _I1 provided by the current sharing bus I _SB and the second current signal S _I22 provided by the second own current bus I _LB2 . By analogy, the Nth power supply unit PSU _N receives the first current signal S _I1 provided by the current sharing bus I _SB and the Nth current signal S _I2N provided by the Nth own current bus I _LBN . It is worth mentioning that the magnitude of the first current signal S _I1 provided by the shared current sharing bus _ISB is equal to the maximum value of the second current signals S _I21 -S _I2N , that is, the current signal on the current sharing bus _ISB (The first current signal S _I1 ) is the maximum output current I _OUT corresponding to all power supply units PSU ₁ -PSU _N (power supply units).

Referring to FIG. 5 , it is a detailed circuit block diagram of the control processor of the power supply unit of the present invention. The active current sharing unit 11 includes a voltage comparison unit 111 and a compensation unit 112 . The voltage comparison unit 111 receives the first current signal S _I1 and the second current signal S _I21 -S _I2N , and subtracts the first current signal S _I1 from the second current signal S _I21 (taking the first power supply unit PSU ₁ as For example, the rest are the same and will not be repeated), the current difference I _DIF between the output current I _OUT1 -I _OUTN of each power supply unit PSU ₁ -PSU _N and the maximum output current of all power supply units PSU ₁ -PSU _N can be known. The current difference _IDIF is then controlled and calculated through the compensation unit 112, wherein the compensation unit 112 can be a digital controller, such as but not limited to a PI (proportional-integral) controller, to generate compensation voltages V _COMP1 -V _COMPN . Therefore, when the current difference between the first current signal S _I1 and the second current signal S _I21 is large, the active current sharing unit 11 provides a larger compensation voltage; otherwise, it provides a smaller compensation voltage. Incidentally, since the first current signal S _I1 corresponds to the maximum output current, the operation of subtracting the aforementioned current values is the difference obtained by subtracting the second current signal S _I21 from the first current signal S _I1 .

4, the average current unit 12 receives the first current signal S _I1 and the second current signal S _I21 -S _I2N , respectively calculates the average value of the first current signal S _I1 as the first current average value S _I1AVG and the second The average value of the current signal S _I21 -S _I2N is the second current average value S _I21AVG -S _I2NAVG , and the difference between the first current average value S _I1AVG and the second current average value S _I21AVG -S _I2NAVG is calculated to generate the average voltage V _AVG1 -V _AVGN .

Specifically, as shown in FIG. 5 , the average current unit 12 includes a first average current calculation unit 121 , a second average current calculation unit 122 and an average current difference calculation unit 123 . The first average current calculation unit 121 receives the first current signal S _I1 , and calculates an average value of the first current signal S _I1 as a first current average value S _I1AVG . The second average current calculation unit 122 receives the second current signals S _I21 -S _I2N , and calculates the average value of the second current signal S _I2 as the second current average value S _I21AVG -S _I2NAVG . Then, the average current difference calculation unit 123 receives the first current average value S _I1AVG and the second current average value S _I2IAVG (taking the first power supply unit PSU ₁ as an example, the rest are the same and will not be described again), and calculates the first current average value The difference between the value S _I1AVG and the second current average value S _I21AVG to generate the average voltage V _AVG1 . Among them, the main purpose of the average current compensation is to help parallel-connected power supply units under continuous dynamic load, the average voltage error caused by current detection and active current sharing delay.

Referring to FIG. 4 , the step-down current unit 13 receives the second current signals S _I21 -S _I2N to generate a step-down compensation voltage V _DROOP1 -V _DROOPN . Specifically, as shown in FIG. 5 , the step-down current unit 13 includes a step-down function calculation unit 131 . The step-down function calculation unit 131 receives the second current signal S _I21 -S _I2N , and generates a step-down compensation voltage V _DROP1 -V _DROOPN according to the magnitude of the second current signal S _I21 -S _I2N . As shown in FIG. 6B, through the self-current detection signal of the power supply unit PSU ₁ -PSU _N , that is, the design of the droop slope of the second current signal S _I21 -S _I2N and the buck compensation voltage V _DROOP1 -V _DROOPN , to achieve the voltage compensation effect. For the step-down current unit 13, it only receives the second current signal S _I21 -S _I2N provided by its own current bus I _LB1 -I _LBN , and does not involve the first current signal S _I1 of the current sharing bus _ISB . And through the built-in (designed) step-down slope of the power supply unit PSU ₁ -PSU _N itself, adjust (regulate) the size of the output voltage changed due to the change of the load. Among them, step-down current sharing can improve the response speed of dynamic load transient current sharing.

Referring to FIG. 4 , the integrated calculation unit 14 receives the compensation voltage V _COMP1 -V _COMPN , the average voltage V _AVG1 -V _AVGN and the buck compensation voltage V _DROOP1 -V _DROOPN . Further, the integrated calculation unit 14 generates the reference voltage V _{OUT_REF1} -V _{OUT_REFN} for the power supply units PSU ₁ -PSU _N according to the compensation voltage V _COMP1 -V _COMPN , the average voltage V _AVG1 -V _AVGN and the step-down compensation voltage V _DROOP1 -V _DROOPN The output voltages V _{OUT_SENSE1} -V _{OUT_SENSEN} are controlled to dynamically share the output currents I _OUT1 -I _OUTN of the power supply units PSU ₁ -PSU _N.

As shown in FIG. 5 , the power supply units PSU ₁ -PSU _N further include a control signal generating unit 15 . Wherein, the control signal generation unit 15 includes an output voltage comparison unit 151 and a control signal generation unit 152 . Specifically, the reference voltage V _{OUT_REF1} -V _{OUT_REFN} generated by the integration calculation unit 14 and the output voltage V _{OUT_SENSE1} -V _{OUT_SENSEN} of the power supply unit PSU ₁ -PSU _N are provided to the output voltage comparison unit 151, and the output voltage comparison unit 151 compares the reference voltage V _{OUT_REF1} -V _{OUT_REFN} is compared (voltage subtracted) with the output voltage V _{OUT_SENSE1} -V _{OUT_SENSEN} to obtain the output voltage difference V _{OUT_DIF} . The control signal generation unit 152 receives the output voltage difference V _{OUT_DIF} , and generates a control signal PWM according to the output voltage difference V _{OUT_DIF} , and then controls the switch to switch the power converter 106 (such as 2) at least one switch element (not shown), and then control the switch to switch the output voltage V _OUT of the power converter 106, that is, the output voltage V _OUT of the power supply unit PSU ₁ -PSU _N , so as to achieve continuous and rapid The current sharing purpose of the output current of the dynamic load.

In summary, the present invention has the following features and advantages:

1. Through the integration of active current sharing control, step-down current sharing control and average current error compensation control, combined with the advantages of each current sharing control, it can achieve continuous fast dynamic load, improve voltage compensation speed and improve current sharing accuracy , so that the output currents of the power supply units connected in parallel under dynamic loads are approximately equal (for example: the average error of the output current between the two is less than 5% of the total output current), to achieve the optimal current sharing effect.

2. The purpose of the active current sharing control is to increase the output voltage by obtaining the difference between the current of the current sharing bus and the current of its own current bus.

3. The purpose of the average current error compensation control is to help parallel power supply units under continuous dynamic loads to achieve a more accurate current sharing effect by compensating the average voltage for the average current error caused by the active current sharing delay.

4. Step-down current sharing control can improve the response speed of dynamic load transient current sharing.

The above is only a detailed description and drawings of preferred embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. As the standard, all embodiments that conform to the spirit of the patent scope of the present invention and its similar changes should be included in the scope of the present invention. Any person familiar with the art can easily think of changes or changes in the field of the present invention. Modifications can all be covered by the patent scope of the following case.

103 ₁ -103 _N : Digital control processor

11: Active current sharing unit

12: Average current unit

13: Buck current unit

14: Integrated Computing Unit

15: Control signal generation unit

I _SB : current sharing bus

I _LB1 -I _LBN : own current bus

S _I1 : the first current signal

S _I21 -S _I2N : Second current signal

V _COMP1 -V _COMPN : Compensation voltage

V _AVG1 -V _AVGN : average voltage

V _DROOP1 -V _DROOPN : Buck compensation voltage

V _{OUT_SENSE1} -V _{OUT_SENSEN} : output voltage

V _{OUT_REF1} -V _{OUT_REFN} : Reference voltage

PWM ₁ -PWM _N : Control signal

Claims (13)

A power supply unit, comprising: a power converter, providing an output current and an output voltage; a current detection circuit, detecting the output current, and providing a current signal corresponding to the magnitude of the output current; a detection signal peripheral circuit , receiving the output voltage, the current signal and a current sharing bus signal, and respectively converting the output voltage, the current sharing bus signal and the current signal into an output voltage signal, a first current signal and a second current signal; A control processor, receiving the output voltage signal, the first current signal and the second current signal, and performing an active current sharing control according to the output voltage signal, the first current signal and the second current signal, a Average current error compensation control and a step-down current sharing control to generate a control signal for controlling the output voltage to adjust the output current; and a current sharing bus signal peripheral circuit; wherein the control The processor digitally filters the second current signal to provide a current sharing signal to the peripheral circuit of the current sharing bus signal; wherein, the peripheral circuit of the current sharing bus signal amplifies the current sharing signal and provides it to an external current sharing bus . The power supply unit as described in claim 1, wherein the peripheral circuit of the detection signal is a step-down circuit to respectively step-down convert the output voltage, the current sharing bus signal and the current signal into the output voltage signal, the second A current signal and the second current signal. The power supply unit as described in claim 1 further includes: A switch driving circuit receives the control signal and controls at least one switch element of the power converter through the control signal. A power supply system with dynamic current sharing, comprising: a current sharing bus, providing a first current signal; a plurality of power supply units connected to each other through the current sharing bus, wherein each of the power supply units has a current bus of its own, providing a The second current signal, a control processor of each power supply unit includes: an active current sharing unit, receiving the first current signal and the second current signal, and comparing the second current signal with the first current signal, to generate a compensation voltage; an average current unit receives the first current signal and the second current signal, and compares the difference between the average value of the first current signal and the average value of the second current signal to generate a average voltage; a step-down current unit, receiving the second current signal to generate a step-down compensation voltage; and an integrated calculation unit, receiving the compensation voltage, the average voltage and the step-down compensation voltage, and according to the compensation voltage, the average voltage and the step-down compensation voltage make the output currents of the power supply units roughly equal. The power supply system with dynamic current sharing as described in claim 4, wherein the integrated calculation unit generates a reference voltage to control an output voltage of the power supply unit, so that the output currents of the power supply units are approximately equal. The power supply system with dynamic current sharing as described in claim item 5, wherein each of the control processors further includes: a control signal generation unit, receiving the reference voltage and the output voltage, and generating according to the reference voltage and the output voltage A control signal is used to control the output voltage of the power supply unit. The power supply system with dynamic current sharing as described in claim item 5, wherein the control signal generation unit includes: an output voltage comparison unit that receives the reference voltage and the output voltage, and calculates a ratio between the reference voltage and the output voltage an output voltage difference; and a control signal generating unit that receives the output voltage difference and generates the control signal according to the output voltage difference. The power supply system with dynamic current sharing as described in Claim 4, wherein the active current sharing unit includes: a voltage comparison unit that receives the first current signal and the second current signal, and calculates the first current signal a current difference from the second current signal; and a compensation unit that receives the current difference and performs an operation on the current difference to generate the compensation voltage. The power supply system with dynamic current sharing as described in Claim 8, wherein the larger the current difference is, the larger the compensation voltage is; the smaller the current difference is, the smaller the compensation voltage is. The power supply system with dynamic current sharing as described in Claim 8, wherein the compensation unit is a proportional-integral controller for performing proportional and integral calculations on the compensation voltage. The power supply system with dynamic current sharing as described in claim 4, wherein the average current unit includes: a first average current calculation unit that receives the first current signal and calculates the average value of the first current signal as a a first average current value; a second average current calculation unit, receiving the second current signal, and calculating the average value of the second current signal as a second average current value; and An average current difference calculation unit receives the first average current and the second average current, and calculates a difference between the first average current and the second average current to generate the average voltage. The power supply system with dynamic current sharing as described in claim 4, wherein the step-down current unit includes: a step-down function calculation unit that receives the second current signal and generates the step-down current signal according to the magnitude of the second current signal Buck compensation voltage. The power supply system with dynamic current sharing according to claim 4, wherein the magnitude of the first current signal is equal to the maximum value of the plurality of second current signals.

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