TW201929365A - Power supply system and control method for power supply system - Google Patents

Abstract

A control method for a power supply system is presented in the present application. The control method is adapted to a power supply system. The power supply system includes a first voltage source and a second voltage source. The first voltage source and the second first voltage source are in serial connection. The method includes: obtaining magnitude of a first current provided by the first voltage source; generating a control signal according to a difference between the magnitude of the first current and a reference value; adjusting the magnitude of the first current of the first voltage source by the control signal; adjusting the current magnitude of the second current of the second voltage source by the control signal.

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 and a power supply system control method in which a plurality of voltage sources are connected in series.

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. 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. The control method of this power supply system is applicable to a power supply system. The power supply system includes a first voltage source and a second voltage source connected in series. The control method of the power supply system includes: obtaining a current amount of a first current provided by the first voltage source; generating a control signal according to a difference between a current magnitude of the first current and a reference current value; The voltage source adjusts the current of the first current according to the control signal; and the second voltage source adjusts the current of the second current according to the control signal.

The invention discloses a power supply system. The power supply system includes a first voltage source and a second voltage source. This second voltage source is connected in series with the first voltage source. The first voltage source includes a first power supply circuit and a processing circuit. The second voltage source includes a second power supply circuit. The first power supply circuit is configured to provide a first current. The processing circuit is electrically connected to the first power supply circuit. The processing circuit is configured to generate a control signal according to a difference between a current magnitude of the first current and a reference current value. The first power supply circuit is configured to adjust the current of the first current according to the control signal. The second voltage source is electrically connected to the processing circuit. The second power supply circuit is configured to provide a second current, and the second power supply circuit is configured to adjust the current of the second current according to the control signal.

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 this power supply system is applicable to a power supply system. The power supply system includes a first voltage source and a second voltage source connected in series. The control method of the power supply system includes: in step S101, obtaining a current magnitude of a first current provided by the first voltage source; and in step S103, according to the current magnitude of the first current and a reference current value The difference generates a control signal; in step S105, the current value of the first current is adjusted according to the control signal by the first voltage source; and in step S107, the current of the second current is adjusted according to the control signal by the second voltage source.

Based on such a control method, the present invention further provides various power supply systems. Referring to FIG. 2, a power supply system is illustrated. FIG. 2 is a functional block diagram of a power supply system according to an embodiment of the invention. The power supply system 1 has a first voltage source 12 and a second voltage source 14. The second voltage source 14 is connected in series to the first voltage source 12, and the first voltage source 12 and the second voltage source 14 are connected in series to the load L. The first voltage source 12 and the second voltage source 14 are used to supply electrical energy to the load L. In practice, the first voltage source 12 can be set to the active master and the second voltage source 14 is set to the passive slave so that the second voltage source 14 is controlled by the first Voltage source 12. The first voltage source 12 and the second voltage source 14 may also be the same type of machine or different types of machines. On the other hand, the number of the second voltage sources 14 of the power supply system 1 may be one or more, and the subsequent description is performed by a single second voltage source 14, but the architecture of the power supply system 1 is not An example is the limitation.

The first voltage source 12 includes a first power supply circuit 122 and a processing circuit 124. The first power supply circuit 122 is electrically connected to the processing circuit 124. The first power supply circuit 122 is configured to provide a first current. The processing circuit 124 is configured to generate a control signal according to the difference between the current magnitude of the first current and a reference current value. The first power supply circuit 122 is configured to adjust the current magnitude of the first current according to the control signal.

In practice, the power supply system 1 has, for example, a detection circuit for obtaining the current of the first current for use by the processing circuit 124. The detection circuit is, for example, a machine independent of the first voltage source 12, or the detection circuit can also It is an element of the voltage source 12 itself, and is not limited herein.

On the other hand, in an embodiment, the control signal records, for example, the difference between the current magnitude of the first current and the reference current value. From another perspective, the control signal is used, for example, to indicate the relative magnitude of the first current and the reference current value. When the current magnitude of the first current is greater than the reference current value, the first power supply circuit 122 reduces the magnitude of the first current according to the control signal. When the current magnitude of the first current is less than the reference current value, the first power supply circuit 122 increases the magnitude of the first current according to the control signal. When the magnitude of the current of the first current is substantially equal to the reference current value, the first power supply circuit 122 does not adjust the first current.

Referring again to FIG. 2, the second voltage source 14 includes a second power supply circuit 142. As before, the second voltage source 14 is connected in series to the first voltage source 12. From another perspective, the second power supply circuit 142 of the second voltage source 14 is coupled in series with the first power supply circuit 122 of the first voltage source 12.

In addition, the second voltage source 14 is electrically coupled to the processing circuit 124 of the first voltage source 12 . The second power supply circuit 142 is configured to provide a second current, and the second power supply circuit 142 is configured to adjust the current of the second current according to the control signal provided by the processing circuit 124. Similar to the first power supply circuit 142, when the current magnitude of the first current is greater than the reference current value, the second power supply circuit 142 reduces the magnitude of the second current according to the control signal. When the current magnitude of the second current is less than the reference current value, the second power supply circuit 142 increases the magnitude of the second current according to the control signal. When the magnitude of the current of the second current is substantially equal to the reference current value, the second power supply circuit 142 does not adjust the first current.

In this embodiment, the first voltage source 12 and the second voltage source 14 have the same rated power. Therefore, when the first power supply circuit 122 and the second power supply circuit 142 are controlled by the same control signal, the first power source The current of the first current provided by the supply circuit 122 is the same as the current of the second current provided by the second power supply circuit 142, and when the first power supply circuit 122 adjusts the first current, the second power supply circuit 142 will also adjust the second current accordingly.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of an equivalent model of a first power supply circuit according to an embodiment of the invention. As shown in FIG. 3, the first power supply circuit 122 can be equivalent to a circuit model. In this equivalent circuit model, the first power supply circuit 122 has a resistor R and an adjustable current source IS, and the resistor R is connected in parallel with the current source IS. The resistor R is an equivalent resistance in the first power supply circuit 122, and the adjustable current source IS is controlled by the processing circuit 124. More specifically, the adjustable current source IS generates an output current based on the control signal provided by the processing circuit 124. A portion of the output current is output as a first current to the outside of the first power supply circuit 122, and another portion of the output current flows through the resistor R to generate a voltage across. In other words, the processing circuit 124 adjusts the magnitude of the current of the first current by instructing the adjustable current source IS and adjusts the voltage across the first power supply circuit 122.

Similar to the first power supply circuit 122, the second power supply circuit 142 can also be equivalent to a similar circuit model. Therefore, when the first power supply circuit 122 and the second power supply circuit 142 have similar equivalent resistances and similar adjustable current sources, since the first power supply circuit 122 and the second power supply circuit 142 are controlled by the processing. The control signal provided by the circuit 124, the first power supply circuit 122 and the second power supply circuit 142 provide a similar output current and have a similar cross-over voltage, thereby stabilizing the system and making the first power supply circuit 122 and the second The power supply circuit 142 is in a voltage equalization state. From another point of view, when the voltage or current of the load L fluctuates, the fluctuation amount is evenly distributed among the first voltage source 12 and the second voltage source 14, instead of being only used by the first voltage source 12 as before. The second voltage source 14 is assumed.

Please refer to FIG. 4. FIG. 4 is a functional block diagram of a power supply system according to another embodiment of the present invention. In this embodiment, the circuit architecture of the power supply system 2 is similar to the power supply system 1 described above, and details are not repeatedly described. The difference is that the processing circuit 224 of the power supply system 2 has an operation sub-circuit 2244 and a compensation sub-circuit 2242. The compensation sub-circuit 2242 is electrically connected to the operation sub-circuit 2244, the first power supply circuit 222, and the second power supply circuit 242, respectively.

The operation sub-circuit 2244 is configured to generate a comparison signal according to the difference between the first current and the reference current value. In practice, the operational subcircuit 2244 is, for example, a subtractor or an adder. The compensation sub-circuit 2242 is configured to form the control signal according to the comparison signal. The compensation sub-circuit 2242 is, for example, a user-defined filter. From another perspective, the operation sub-circuit 2244 is configured to operate according to the parameter values of the first current and the reference current value, and the compensation sub-circuit 2242 is configured to convert the operation result of the operation sub-circuit into a back-end acceptable Command aspect. In an embodiment, the compensation sub-circuit 2242 is further configured to adjust the control signal to stabilize the system.

Please refer to FIG. 5. FIG. 5 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. 5, the first voltage source 32 has a first power rating and the second voltage source 34 has a second power rating, the first power rating being different from the second power rating. In this embodiment, the first voltage source 32 further has a first gain circuit 326, and the second voltage source 34 further has a second gain circuit 346. The first gain circuit 326 is electrically connected to the processing circuit 324 and the first power supply circuit 322. The second gain circuit 346 is electrically connected to the processing circuit 324 and the second power supply circuit 342.

The first gain circuit 326 is configured to adjust the control signal according to a first weight gain to form a first compensation signal. The second gain circuit 346 is configured to adjust the control signal according to a second weight gain to form a second compensation signal. The second power supply circuit 342 is configured to adjust the current magnitude of the second current according to the second compensation signal. Wherein, the first weight gain is a ratio of the first rated power to the power sum of the first rated power and the second rated power, and the second weighted gain is the sum of the second rated power and the power of the first rated power and the second rated power ratio. In another aspect, the first weight gain is a first power rating divided by a power sum of the first power rating and the second power rating, and the second weight gain is a second power rating divided by the first power rating and the first power rating The sum of the power and power of the two rated powers.

The first current and the second current are appropriately adjusted by the first weight gain and the second weight gain, although the first power rating of the first voltage source 32 is different from the second power rating of the second voltage source 34, the first voltage Source 32 and second voltage source 34 are still capable of maintaining a voltage equalization. Further, as described above, when the voltage or current of the load L fluctuates, the voltage fluctuation amount or the current fluctuation amount is evenly distributed to the first voltage source 32 and the second voltage source 34, and is not only the first The voltage source 32 is borne by the second voltage source 34.

Please refer to FIG. 6. FIG. 6 is a functional block diagram of a power supply system according to another embodiment of the present invention. The structure of the power supply system 1' in the embodiment shown in Fig. 6 is similar to that of the power supply system 1 in Fig. 2. The difference is that the power supply system 1' has the second voltage sources 14a', 14b'. It should be noted that it is within the scope of the present invention that the first voltage source 12' and the second voltage source 14a', 14b' are in series relationship on the power circuit. That is, the first voltage source 12' may also be connected in series between the second voltage sources 14a', 14b', or the first voltage source 12' may be connected in series to the second voltage sources 14a', 14b' but Only the second voltage source 14b' is electrically connected, which is not limited herein.

This embodiment is used to clearly illustrate the case where the power supply system has a plurality of second power supply circuits. As before, the first voltage source 12' and the second voltage source 14a', 14b' may be voltage sources of the same specification. That is, the power supply system 1' has a plurality of identical voltage sources, and controls all of the voltage sources in the power supply system 1' by the magnitude of the current supplied by one of the voltage sources. In one embodiment, the first voltage source 12' can be set to the active master and the second voltage source 14a', 14b' can be set to the passive slave.

The first voltage source 12' includes a first power supply circuit 122' and a processing circuit 124'. The first power supply circuit 122' is electrically coupled to the processing circuit 124'. The first power supply circuit 122' is configured to provide a first current. The processing circuit 124' is configured to generate a control signal according to the difference between the current magnitude of the first current and a reference current value. The first power supply circuit 122' is configured to adjust the current magnitude of the first current according to the control signal. On the other hand, the second voltage sources 14a', 14b' adjust the magnitude of the current of the second current in accordance with the control signal as described above. In practice, the voltage sources in FIG. 6 may have implementations as in the foregoing FIG. 3, FIG. 4, and FIG. 5, and details are not described herein again.

In summary, the present invention provides a method for controlling a power supply system and a power supply system, wherein an output current of one of a plurality of mutually connected voltage sources generates a corresponding control signal to adjust an output current of the other voltage source. Thereby, each voltage source can be adjusted to equalize voltage, and the related circuit architecture and control method are not only concise and accurate, but also quite practical.

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, 2, 3‧‧‧ Power Supply System

12, 22, 32‧‧‧ first voltage source

122, 222, 322‧‧‧ power supply circuit

124, 224, 324‧ ‧ processing circuits

2242, 3242‧‧‧Compensation subcircuit

2244, 3244‧‧‧Operator circuit

326‧‧‧First gain circuit

14, 24, 34‧‧‧ second voltage source

142, 242, 342‧‧‧ second power supply circuit

346‧‧‧second gain circuit

IS‧‧‧ adjustable current source

L‧‧‧load

R‧‧‧resistance

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

Claims (5)

A power supply system control method is applicable to a power supply system, the power supply system includes a first voltage source and a second voltage source connected in series, and the control method of the power supply system includes: obtaining the first voltage source Providing a current of a first current; generating a control signal according to a difference between a current magnitude of the first current and a reference current value; and adjusting a current of the first current according to the control signal by the first voltage source And adjusting, by the second voltage source, a current of a second current provided by the second voltage source according to the control signal. The control method of the power supply system of claim 1, wherein the first voltage source has a first rated power, the second voltage source has a second rated power, the first rated power and the second rated power The step of adjusting the current of the first current according to the control signal by the first voltage source further comprises: adjusting the control signal according to a first weight gain to generate a first compensation signal, the first weight gain a ratio of the first rated power to a power sum of the first rated power and the second rated power; adjusting the control signal according to a second weight gain to generate a second compensation signal, the second weight gain a ratio of the second rated power to a power sum of the first rated power and the second rated power; adjusting a current magnitude of the first current according to the first compensation signal by the first voltage source; The second voltage source adjusts the current of the second current according to the second compensation signal. A power supply system includes: a first voltage source, comprising: a first power supply circuit for providing a first current; and a processing circuit electrically connected to the first power supply circuit, the processing circuit is configured to And generating a control signal according to the difference between the current magnitude of the first current and a reference current value, wherein the first power supply circuit is configured to adjust a current magnitude of the first current according to the control signal; and a second voltage source, The second voltage source is electrically connected to the first voltage source, and the second voltage source is electrically connected to the processing circuit, the second voltage source includes a second power supply circuit, and the second power supply circuit is configured to provide a first And a second current, and the second power supply circuit is configured to adjust a current of the second current according to the control signal. The power supply system of claim 3, wherein the processing circuit comprises: an operation sub-circuit electrically connected to the first power supply circuit, wherein the operation sub-circuit is configured to determine a difference between the first current and the reference current value The value generates a comparison signal; and a compensation sub-circuit electrically connected to the operation sub-circuit, wherein the compensation sub-circuit is configured to form the control signal according to the comparison signal. The power supply system of claim 3, wherein the first voltage source has a first rated power, and the second voltage source has a second rated power, the first rated power being different from the second rated power, wherein The first voltage source further includes a first gain circuit, and the second voltage source further includes a second gain circuit electrically connected to the processing circuit and the first power supply circuit, the first gain circuit The second gain circuit is electrically connected to the processing circuit and the second power supply circuit, and the second gain circuit is configured to be based on a second The weight gain adjusts the control signal to form a second compensation signal, and the second power supply circuit is configured to adjust a current level of the second current according to the second compensation signal; wherein the first weight gain is the first rated power Comparing the power sum of the first rated power and the second rated power, the second weight gain is the second rated power compared to the first rated power and the first The ratio of the power sum of the two rated powers.