TWI649936B - Power supply system and control method for power supply system - Google Patents

Abstract

A control method for a power supply system is adapted to control a power supply system having a plurality of current sources. These current sources are connected in series with each other. The control method of the power supply system includes: measuring a voltage difference between two terminals of each current source to obtain a plurality of voltage difference signals; calculating a voltage equalization signal according to the voltage difference signals; and determining the voltage difference signals according to the voltage equalization signals A plurality of correction signals are generated to respectively adjust a plurality of output currents of the current sources, and the correction signals are respectively associated with a plurality of differences between the signal values of the voltage equalization signals and the signal values of the voltage difference signals.

Description

Power supply system and control method of power supply system

The present invention relates to a power supply system and a power supply system control method, and more particularly to a power supply system having a plurality of current sources and a control method of a power supply system having a plurality of current sources.

In practice, power supply systems typically have multiple power supplies to accommodate different specifications of load. The power supply of the power supply system is, for example, a voltage source or a current source, or can be switched to a voltage source or a current source as needed. In the past, it has not been technically allowed to simply connect a plurality of voltage sources in parallel or to connect a plurality of current sources in series. The power supply system has two DC power sources, and the two DC power sources are connected in series and the output load is a voltage source. In the past, one of the two DC power sources is set as a current source, and the second The other of the DC power supplies is set as a voltage source. Under this architecture, one of the DC power supplies set as the current source is used to actively adjust the current or adjust the voltage according to the load condition; another DC power source set as the voltage source is used to actively adjust the voltage or adjust according to the load condition. Current.

However, under this architecture, the instantaneously increased voltage or reduced voltage must be reflected by one of the DC power sources (set as the current source) at the moment when the voltage of the load changes. That is to say, this voltage variation is only tolerated by a single DC power source. Similarly, at the moment when the current of the load changes, the instantaneously increased current or the reduced current must be reacted by one of the DC power sources (set as the voltage source). That is to say, this current variation is only tolerated by a single DC power source. In other words, such an architecture is intuitive and easy to design, but in practice it is possible to put a considerable burden on the DC power supply, reducing the life of the DC power supply, or even causing danger.

The present invention provides a power supply system and a power supply system control method to overcome the problem that the power supply system of the prior art causes the DC power supply to bear too much load when the load condition changes.

The invention discloses a control method of a power supply system, which is suitable for controlling a power supply system having a plurality of current sources, which are connected in series with each other. The control method of the power supply system includes: measuring a voltage difference between two terminals of each current source to obtain a plurality of voltage difference signals; calculating a voltage equalization signal according to the voltage difference signals; and determining the voltage difference signals according to the voltage equalization signals A plurality of correction signals are generated to respectively adjust a plurality of output currents of the current sources, and the correction signals are respectively associated with a plurality of differences between the signal values of the voltage equalization signals and the signal values of the voltage difference signals.

The invention discloses a power supply system. The power supply system has a plurality of current sources and a voltage equalization control circuit. Each current source has two connections. These current sources are connected in series with each other at these terminals. There is a voltage difference between the two terminals of each current source. The voltage equalization control circuit is electrically connected to the current sources. The voltage equalization control circuit is configured to generate a voltage equalization signal according to the voltage differences. This equalization signal indicates an average voltage difference. And the voltage equalization control circuit is configured to generate a plurality of correction signals according to the plurality of differences between the voltage differences and the average voltage difference. Each correction signal is used to indicate that one of the current sources adjusts the output current.

The invention discloses a power supply system. The power supply system has a plurality of current sources and a plurality of voltage equalization control circuits. Each current source has two connections. These current sources are connected in series with each other at these terminals. There is a voltage difference between the two terminals of each current source. Each of the voltage equalization control circuits is electrically connected to the current sources. Each voltage equalization control circuit is configured to generate a voltage equalization signal based on the voltage differences. The voltage equalization signal is used to indicate an average voltage difference, and each voltage equalization control circuit is configured to generate a correction signal according to a difference between one of the voltage difference signals and the average voltage difference. Each correction signal is used to indicate one of the current sources to adjust the output current.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1. FIG. 1 is a flow chart of a method for controlling a power supply system according to an embodiment of the invention. The control method of the power supply system is adapted to control a power supply system having a plurality of current sources that are connected in series with each other. The control method of the power supply system includes: step S101, measuring a voltage difference between two terminals of each current source to obtain a plurality of voltage difference signals; and step S103, calculating a voltage equalization signal according to the voltage difference signals; step S105 And generating a plurality of correction signals according to the voltage equalization signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources, wherein the correction signals are respectively associated with the signal values of the voltage equalization signals and the signal values of the voltage difference signals. Multiple differences.

Based on such a control method, the present invention provides a plurality of different power supply systems. Referring to FIG. 2A, a power supply system is illustrated. FIG. 2A is a functional block diagram of a power supply system according to an embodiment of the invention. The power supply system 1 has a plurality of current sources and a voltage equalization control circuit 14. In this embodiment, the power supply system 1 has the current sources 12a, 12b, and 12c as an example. However, the number of current sources that the power supply system 1 has is not limited thereto. The current sources 12a, 12b, 12c are connected in series with each other, and the current sources 12a, 12b, 12c are connected in series to the load L. Each of the current sources 12a, 12b, 12c has two terminals. The current sources 12a, 12b, 12c are connected in series with each other at these connection ends. There is a voltage difference between the two terminals of any of the current sources 12a, 12b, 12c. In this embodiment, the two terminals of the current source 12a have a voltage difference Va, the two terminals of the current source 12b have a voltage difference Vb, and the two terminals of the current source 12c have a voltage difference Vc. The voltage equalization control circuit 14 is electrically connected to the current sources 12a, 12b, and 12c, respectively. In FIG. 1, the connection relationship between the electric powers of the respective elements is indicated by a thick line, and the communication relationship between the elements is indicated by thin lines to exchange the information connection relationship.

The voltage equalization control circuit 14 is configured to generate a voltage equalization signal according to the voltage differences Va, Vb, and Vc. The voltage equalization signal indicates an average voltage difference. In one embodiment, the average voltage difference is the arithmetic mean of the voltage differences Va, Vb, Vc. The equalization control circuit 14 is configured to generate a plurality of correction signals according to the plurality of voltage differences and the plurality of differences of the average voltage differences, each of the correction signals for indicating one of the current sources 12a, 12b, and 12c to adjust the output. Current.

Referring to FIG. 2B again, FIG. 2B is a functional block diagram of a power supply system according to another embodiment of the present invention. In the embodiment shown in Fig. 2B, the architecture of the power supply system 1' is substantially similar to that of the power supply system 1 as described above. However, in the embodiment shown in Fig. 2B, the power supply system 1' further has measurement circuits 16a', 16b', 16c'. The measuring circuits 16a', 16b', 16c' are electrically connected to the current sources 12a', 12b', 12c', respectively. The measuring circuits 16a', 16b', 16c' respectively generate voltage difference signals Sa', Sb', Sc' in accordance with the voltage differences Va, Vb, Vc as described above.

Continuing the foregoing, the voltage difference signal Sa' is used to indicate the voltage difference Va as described above, and the voltage difference signal Sb' is used to indicate the voltage difference Vb as described above, and the voltage difference signal Sc' is used to indicate the voltage difference Vc as described above. In practice, the measurement circuits 16a', 16b', 16c' may be implemented in the current sources 12a', 12b', 12c', respectively, or the measurement circuits 16a', 16b', 16c' may be real The voltage equalizing control circuit 14', or the measuring circuits 16a', 16b', 16c' may also be independent of the current sources 12a', 12b', 12c' and the voltage equalizing control circuit 14', which is not Limit it. Subsequent to the architecture shown in FIG. 2B, that is, the measurement circuits 16a', 16b', 16c' are independent of the current sources 12a', 12b', 12c' and components other than the equalization control circuit 14' for subsequent Description.

Referring to FIG. 3, the current source 12a (current source 12a') will be further described. FIG. 3 is a schematic diagram of an equivalent circuit model of a current source according to an embodiment of the invention. As shown in FIG. 3, the current source 12a has, for example, an adjustable current circuit IS and an equivalent resistance R, and the adjustable current circuit IS is connected in parallel with the equivalent resistance R. It should be noted that the equivalent resistance R is the equivalent resistance of the overall circuit of the current source 12a, and does not mean that the current source 12a really has a resistor connected in parallel with the adjustable current circuit IS.

Referring to the circuit structure shown in FIG. 3, when the magnitude of the current supplied by the adjustable current circuit IS is greater than the current required by the load L or the current required by the system, the excess current flows through the equivalent resistor R and A current loop formed by the adjustable current circuit IS. At this time, in addition to causing a burden on the adjustable current circuit IS, the circuit of the current source 12a is further heated or even burned, and this may also occur in the current source 12b or the current source 12c. From another point of view, when the voltage of the load L fluctuates or the current flowing through the load L fluctuates, the voltage fluctuation amount or the current fluctuation amount of the load L affects the voltage across the current sources 12a, 12b, and 12c, and The current flowing through the equivalent resistance R affects the problem of heat generation.

Corresponding to this, the voltage equalization control circuit 14 is used to control the respective current sources so that the respective current sources maintain the voltage equalization as much as possible. The voltage equalizing control circuit 14 is electrically connected to the current sources 12a, 12b, 12c and the measuring circuits 16a, 16b, 16c, respectively. The voltage equalization control circuit 14 is configured to generate a voltage equalization signal according to the voltage difference signals Sa, Sb, and Sc, and the voltage equalization control circuit 14 is configured to use the difference between the voltage difference signals Sa, Sb, and Sc and the equalization signal. The values produce correction signals Ska, Skb, Skc. The signal value of the voltage equalization signal is, for example, an arithmetic mean or a weighted average of the signal values of the respective voltage difference signals. The signal value of one of the correction signals is associated with a difference between one of the voltage difference signals and the voltage equalization signal. In practice, the equalization control circuit 14 can be a stand-alone machine or a control board. Alternatively, the voltage equalization control circuit 14 can be implemented as one of the current sources 12a, 12b, 12c.

In an embodiment, at a corresponding time point, the signal value of the correction signal Ska is the difference between the signal value of the voltage difference signal Sa and the voltage equalization signal, and the signal value of the correction signal Skb is the voltage difference signal Sb and the voltage equalization signal. The difference between the signal values and the signal value of the correction signal Skc is the difference between the signal value of the voltage difference signal Sc and the voltage equalization signal. The correction signals Ska, Skb, and Skc are used to respectively indicate one of the current sources 12a, 12b, and 12c to adjust the output current. After adjustment, the voltage difference between the two terminals of the current source 12a is substantially equal to the voltage difference between the two terminals of the current source 12b, and the voltage difference between the two terminals of the current source 12a is substantially equal to the two connections with the current source 12c. The voltage difference at the end. Thereby, the current sources 12a, 12b, 12c are brought to a voltage equalization.

Referring to FIG. 4A, FIG. 4A is a functional block diagram of a power supply system according to a further embodiment of the present invention. In the embodiment shown in FIG. 4A, the structure of the power supply system 2 is substantially the same as that of the power supply system 1 as described above. The difference is that the voltage equalization control circuit 24 of the power supply system 2 has the first arithmetic circuit 242 and the second arithmetic circuits 244a, 244b, 244c. The second operation circuits 244a, 244b, and 244c are electrically connected to the current sources 22a, 22b, and 22c, respectively, and the second operation circuits 244a, 244b, and 244c are electrically connected to the first operation circuit 242, respectively.

In this embodiment, when the first operation circuit 242 obtains the voltage difference signals Sa, Sb, and Sc, the first operation circuit 242 is configured to perform arithmetic calculation on the signal values of the voltage difference signals Sa, Sb, and Sc to generate the average Pressure signal Sav.

One of the second operation circuits 244a, 244b, and 244c is configured to compare the equalization signal Sav with the corresponding voltage difference signals Sa, Sb, and Sc to control one of the corresponding current sources 22a, 22b, and 22c to selectively adjust the output. Current. For example, the second operation circuit 244a is configured to compare the equalization signal Sav with the voltage difference signal Sa, and the second operation circuit 244a is configured to generate the correction signal Ska according to the comparison result to indicate the current source 22a to be adjusted. The size of the output current. In an embodiment, the second operation circuit 244a is configured to subtract the signal value of the voltage equalization signal Sav from the signal value of the voltage difference signal Sa to generate the correction signal Ska.

As a practical example, when the signal value of the voltage difference signal Sa is greater than the signal value of the voltage equalization signal Sav, the second operation circuit 244a' instructs the current source 22a to reduce the output current by the correction signal Ska. The current flowing down the equivalent resistance of the current source 22a reduces the voltage difference across the current source. Conversely, when the signal value of the voltage difference signal Sa is smaller than the signal value of the voltage equalization signal Sav, the second operation circuit 244a' instructs the current source 22a to increase the output current by the correction signal Ska, thereby increasing the current flowing through the current. The current of the equivalent resistance of source 22a' drops the voltage difference across the current source.

Please refer to FIG. 4B together. FIG. 4B is a functional block diagram of a power supply system according to still another embodiment of the present invention. In the embodiment shown in Fig. 4B, current sources 22a', 22b', 22c' further have power supply circuits 222a', 222b', 222c' and third operational circuits 224a', 224b', 224c', respectively. The power supply circuits 222a', 222b', 222c' are electrically connected to the third arithmetic circuits 224a', 224b', 224c', respectively. Power supply circuits 222a', 222b', 222c' are used to provide output currents as previously described. In addition, taking the current source 22a' as an example, the third operational circuit 224a' of the current source 22a' is used to instruct the power supply circuit 222a' to adjust the output current according to the reference signal Iref and the voltage difference signal Sa. The third operational circuit 224a' is, for example, a current controlled current source and is controlled by a reference signal Sref. The reference signal Sref is, for example, a current signal or a voltage signal, which is not limited herein. For example, when the reference signal Sref is a current signal, the power supply circuit 222a' is, for example, a current-controlled current source, and the third operation circuit 224a' is configured to adjust the current of the reference signal Sref according to the correction signal Ska. The adjusted reference signal Sref is supplied to the power supply circuit 222a'. The manner of operation of the current source 22b' and the current source 22c' can be deduced by analogy and will not be described again.

Please refer to FIG. 5. FIG. 5 is a functional block diagram of a power supply system according to another embodiment of the present invention. In the embodiment shown in FIG. 5, the circuit structure of the power supply system 3 is substantially similar to the power supply system 2 described above, and details are not described herein again. The difference is that the voltage equalization control circuit 34 of the power supply system 3 further has gain circuits 346a, 346b, 346c. The gain circuits 346a, 346b, and 346c are electrically connected to the second arithmetic circuits 344a, 344b, and 344c, respectively, and the gain circuits 346a, 346b, and 346c are electrically connected to the arithmetic circuit 342, respectively. The gain circuits 346a, 346b, 346c respectively correspond to one of a plurality of weight gains. In one embodiment, the rated power of the current sources 32a, 32b, 32c is different, and the weight gain corresponding to the gain circuit 346a is the ratio of the rated power of the current source 32a to the total rated power of the current sources 32a, 32b, 32c, and the gain circuit The weight gain corresponding to 346b is the ratio of the rated power of the current source 32b to the total rated power of the current sources 32a, 32b, 32c. The weight gain corresponding to the gain circuit 346c is the rated power and current sources 32a, 32b of the current source 32c, The ratio of the total rated power of 32c. The above is merely an example, and may be applied to the above when the rated power of some of the current sources is the same.

In this embodiment, the second operation circuit 344a is configured to generate the preliminary correction signal Ska' according to the voltage equalization signal Sav and the voltage difference signal Sa. Similarly, the second operation circuit 344b is configured to generate a preliminary correction signal Skb' according to the voltage equalization signal Sav and the voltage difference signal Sb, and the second operation circuit 344c is configured to generate a preliminary correction signal Ska' according to the voltage equalization signal Sav and the voltage difference signal Sc. . The second arithmetic circuit 344a, 344b, 344c generates the preliminary correction signals Ska', Skb', Skc' according to the voltage equalization signal Sav and the voltage difference signals Sa, Sb, Sc. The relevant details are similar to the second operation circuit 244a according to the voltage equalization. The signal Sav and the voltage difference signal Sa generate a correction signal Ska, which will not be described here.

The gain circuits 346a, 346b, and 346c are configured to adjust the preliminary correction signals Ska', Skb', and Skc' respectively according to the corresponding weight gains to respectively generate the correction signals Ska, Skb, and Skc. Taking the gain circuit 346a as an example, the gain circuit 346a multiplies the signal value of the preliminary correction signal Ska' by the corresponding gain (the ratio of the rated power of the current source 32a to the total rated power of the current sources 32a, 32b, 32c). A correction signal Ska is generated. The correction signal Ska is used to instruct the current source 322a to adjust the corresponding output current. In practice, the gains of the gain circuits 346a, 346b, and 346c may be preset or dynamically adjustable, and are not limited herein.

Please refer to FIG. 6 to illustrate another power supply system provided by the present invention. FIG. 6 is a functional block diagram of a power supply system according to still another embodiment of the present invention. In the embodiment shown in FIG. 6, the structure of the power supply system 4 is substantially similar to the power supply system 1 described above, and details thereof will not be repeated. The power supply system 4 is different from the power supply system 1 in that the power supply system 4 has a plurality of equalization control circuits, and the equalization control circuits 44a, 44b, and 44c are described as an example. The equalization control circuits 44a, 44b, and 44c are electrically connected to the current sources 42a, 42b, and 42c, respectively. The voltage equalization control circuits 44a, 44b, and 44c are respectively configured to generate correction signals Ska, Skb, and Skc according to the voltage difference signals Sa, Sb, and Sc to respectively instruct the current sources 42a, 42b, and 42c to adjust the output current.

In practice, the equalization control circuits 44a, 44b, 44c can be multiple independent machines or multiple independent control boards. Or, in another implementation manner, since the control method of the power supply system provided by the present invention performs correlation determination and control according to the voltage difference signals of the current sources, the voltage difference signals Sa and Sb of the respective current sources are provided. And Sc to the equalizing control circuits 44a, 44b, 44c, the equalizing control circuits 44a, 44b, 44c may also be implemented in the current sources 42a, 42b, 42c, respectively, and not necessarily to be implemented as separate machines or control boards . From another point of view, each current source can adjust the output current of the current source as long as the required voltage difference signal is obtained, thereby achieving the effect of voltage equalization of each current source. In this embodiment, the current sources 42a, 42b, 42c need not be deliberately set to be active masters or slaves. In this way, in addition to making the control step relatively simple, and each of the current sources 42a, 42b, 42c can maintain their independence, avoiding one current source error and implicating other current sources.

Please refer to FIG. 7. FIG. 7 is a functional block diagram of a power supply system according to still another embodiment of the present invention. In the embodiment shown in FIG. 7, the structure of the power supply system 5 is substantially similar to that of the power supply system 4, and details thereof will not be repeated. The power supply system 5 is different from the power supply system 4 in that the voltage equalization control circuits 54a, 54b, 54c of the power supply system 5 have first operational circuits 542a, 542b, 542c, second operational circuits 544a, 544b, 544c, respectively. And gain circuits 546a, 546b, 546c. In the voltage equalization control circuit 54a, the gain circuit 546a is electrically connected to the second operation circuit 544a, and the gain circuit 546a is electrically connected to the current source 522a.

In summary, the present invention provides a method of controlling a power supply system and a power supply system. In the case of a power supply system, the power supply system has a plurality of current sources connected in series with each other, and the voltage equalization control circuit of the power supply system adjusts the output current of each current source according to the voltage difference signal and the voltage equalization signal. Thereby, even when the current source is connected in series, when the terminal voltage of the load changes, the voltage difference between the two ends of each current source is still the same, that is, each current source is equalized. On the other hand, when the voltage at the end of the load changes, the voltage difference between the load and the voltage equalization signal will be shared by all the current sources, and the single or a few current sources will be avoided. Variety.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1~5‧‧‧Power supply system

12a~52a, 12b~52b, 12c~52c‧‧‧current source

222a', 222b', 222c'‧‧‧ power supply circuit

224a', 224b', 224c'‧‧‧ third arithmetic circuit

14~54‧‧‧Voltage control circuit

242, 342, 542a, 542b, 542c‧‧‧ first arithmetic circuit

244a, 244b, 244c, 344a, 344b, 344c, 544a, 544b, 544c‧‧‧ second arithmetic circuit

346a, 346b, 346c, 546a, 546b, 546c‧‧‧ gain circuits

16a', 16b', 16c', 26a', 26b', 26c', 26a~56a, 26b~56b, 26c~56c‧‧‧ measuring circuit

E1, E2‧‧‧ connection

IS‧‧‧ adjustable current circuit

L‧‧‧load

R‧‧‧ equivalent resistance

Sa, Sb, Sc‧‧‧ voltage difference signal

Sav‧‧‧pressure signal

Ska, Skb, Skc‧‧‧ correction signal

Ska’, Skb’, Skc’‧‧‧ preliminary correction signal

FIG. 1 is a flow chart of a method for controlling a power supply system according to an embodiment of the invention. 2A is a functional block diagram of a power supply system according to an embodiment of the invention. 2B is a functional block diagram of a power supply system according to another embodiment of the present invention. FIG. 3 is a schematic diagram of an equivalent circuit model of a current source according to an embodiment of the invention. 4A is a functional block diagram of a power supply system according to a further embodiment of the present invention. 4B is a functional block diagram of a power supply system according to still another embodiment of the present invention. FIG. 5 is a functional block diagram of a power supply system according to still another embodiment of the present invention. FIG. 6 is a functional block diagram of a power supply system according to still another embodiment of the present invention. FIG. 7 is a functional block diagram of a power supply system according to still another embodiment of the present invention.

Claims (11)

A control method for a power supply system is adapted to control a power supply system having a plurality of current sources connected in series with each other. The control method of the power supply system includes: measuring voltages of two terminals of each of the current sources Comparing to obtain a plurality of voltage difference signals; calculating a voltage equalization signal according to the voltage difference signals; and generating a plurality of correction signals according to the voltage equalization signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources The correction signals are respectively associated with a plurality of differences between the signal value of the voltage equalization signal and the signal value of the voltage difference signals. The control method of the power supply system of claim 1, wherein the current sources have different power ratings, and the step of generating the correction signals according to the voltage equalization signal and the voltage difference signals further comprises: The voltage signals are respectively subtracted from the voltage differences to generate a plurality of preliminary correction signals; and the preliminary correction signals are respectively adjusted according to the plurality of weight gains to generate the correction signals, and one of the weight gains is the current sources And a ratio of a rated power of the corresponding current source to a total rated power of the current sources; and indicating, by each of the correction signals, one of the current sources to adjust the output current. The control method of the power supply system of claim 2, wherein the current sources are respectively controlled by a plurality of control currents, the control method further comprising adjusting a current of a reference current by one of the correction signals and The adjusted current is supplied with the adjusted reference current. A power supply system comprising: a plurality of current sources, each of the current sources having two connection ends, wherein the current sources are connected in series with each other, and each of the current sources has a voltage difference between the two connection ends; and a voltage equalization control circuit And respectively, electrically connecting the current sources, the voltage equalization control circuit is configured to generate a voltage equalization signal according to the voltage differences, the voltage equalization signal indicating an average voltage difference, and the voltage equalization control circuit is configured to be based on the voltages The plurality of differences between the difference and the average voltage difference generate a plurality of correction signals, each of the correction signals being used to indicate one of the current sources to adjust the output current. The power supply system of claim 4, wherein the voltage equalization control circuit further comprises: a first operational circuit electrically connected to the current sources, the first operational circuit configured to generate the average according to the voltage differences And a plurality of second operation circuits electrically connected to the first operation circuit, wherein one of the second operation circuits is used for subtracting one of the voltage equalization signals from the voltage difference, To generate the corresponding correction signal. The power supply system of claim 4, wherein the rated power of the current sources is different, the voltage equalization control circuit further includes: a first operational circuit electrically connected to the current sources, the first operational circuit The voltage equalizing signal is generated according to the voltage differences; the plurality of second computing circuits are electrically connected to the first computing circuit, and one of the second computing circuits is configured to use the voltage equalizing signal and the voltage difference Corresponding one of the subtraction to generate a corresponding preliminary correction signal; and a plurality of gain circuits, each of the gain circuits being electrically connected to one of the gain circuits of the operation circuit, each of the gain circuits Corresponding to one of a plurality of weight gains, The gain circuit is configured to adjust the corresponding preliminary correction signals according to the corresponding weight gains to generate the correction signals, wherein one of the weight gains is one of the current sources and the currents of the current sources The ratio of the total rated power of the source. The power supply system of claim 4, wherein one of the current sources comprises: a third operation circuit electrically connected to the voltage equalization controller, wherein the third operation circuit is configured to adjust according to the corresponding correction signal a current of a reference current; and a power supply circuit electrically connected to the third operational circuit, the power supply circuit for providing an output current according to the reference current adjusted by the third operational circuit. A power supply system includes: a plurality of current sources, each of the current sources having two connection ends, wherein the current sources are connected in series with each other, and each of the current sources has a voltage difference between the two terminals a plurality of voltage equalization control circuits, each of which is electrically connected to the current sources, and each of the voltage equalization control circuits generates a voltage equalization signal according to the voltage differences, and the voltage equalization signal is used for Instructing an average voltage difference, and each of the voltage equalization control circuits is configured to generate a correction signal according to a difference between one of the voltage differences and the average voltage difference, and each of the correction signals is used to indicate the One of the current sources corresponds to the output current. The power supply system of claim 8, wherein one of the voltage equalization control circuits further comprises: a first operational circuit electrically connected to the current sources, wherein the first operational circuit is configured to be based on the voltages The difference generates the equalization signal; a second operation circuit electrically connected to the first operation circuit, wherein the second operation circuit is configured to subtract the corresponding voltage difference from the corresponding voltage difference to generate a corresponding correction signal; wherein the weight gain is The ratio of the rated power of the current source electrically connected to the voltage equalization control circuit to the sum of the powers of the rated power of the current sources. The power supply system of claim 8, wherein the current sources each have different power ratings, and one of the voltage equalization control circuits includes: a first operational circuit electrically connected to the current sources The first operational circuit is configured to generate the equalization signal according to the voltage differences; and a second operational circuit electrically connected to the first operational circuit, the second operational circuit configured to use the equalization signal and the corresponding The voltage difference is subtracted to generate a corresponding preliminary correction signal; a gain circuit is electrically connected to the second operation circuit, and the gain circuit is configured to adjust the preliminary correction signal according to one of the plurality of weight gains to generate a corresponding The correction signal; and wherein the weight gain is a ratio of a rated power of the current source electrically connected to the voltage equalization control circuit to a power sum of the rated power of the current sources. The power supply system of claim 8, wherein the current sources are respectively controlled by a plurality of control currents, and each of the voltage equalization control circuits is configured to adjust the control currents by one of the correction signals One of the current values, one of the current sources includes: a third operation circuit electrically connected to the corresponding voltage equalization controller, wherein the third operation circuit is configured according to the corresponding voltage equalization controller The correction signal adjusts a current level of a reference current; and a power supply circuit electrically connected to the third operation circuit, wherein the power supply circuit is configured to provide an output current according to the reference current adjusted by the third operation circuit.