CN109947161B - Power supply system and control method thereof - Google Patents
Power supply system and control method thereof Download PDFInfo
- Publication number
- CN109947161B CN109947161B CN201711383662.1A CN201711383662A CN109947161B CN 109947161 B CN109947161 B CN 109947161B CN 201711383662 A CN201711383662 A CN 201711383662A CN 109947161 B CN109947161 B CN 109947161B
- Authority
- CN
- China
- Prior art keywords
- current
- power supply
- voltage source
- circuit
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a control method of a power supply system. The control method of the power supply system is suitable for 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 comprises the following steps: obtaining the current magnitude of a first current provided by the first voltage source; generating a control signal according to the difference value between the current magnitude of the first current and a reference current value; adjusting the current of the first current by the first voltage source according to the control signal; the second voltage source adjusts the current of the second current according to the control signal. The invention also discloses a power supply system.
Description
Technical Field
The present invention relates to a power supply system and a control method thereof, and more particularly, to a power supply system with a plurality of voltage sources connected in series and a control method thereof.
Background
In practice, a power supply system usually has a plurality of power sources to accommodate loads of different specifications. The power source 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 according to the requirement. Taking an example of a power supply system having two dc power sources connected in series and an output load as a voltage source, in the past, one of the two dc power sources is set as a current source and the other one of the two dc power sources is set as a voltage source. Under the framework, one direct current power supply set as a current source is used for actively adjusting current or adjusting voltage according to the load condition; the other dc power source, which is configured as a voltage source, is used to actively adjust the voltage or adjust the current in response to the load condition.
However, in this structure, at the moment when the voltage of the load fluctuates, the instantaneously increasing voltage or decreasing voltage must be reflected by one of the dc power supplies (set as a current source). That is, only a single dc power source is subjected to the voltage variation. Similarly, at the instant when the current of the load fluctuates, the instantly increasing current or the instantly decreasing current must be reflected by one of the dc power supplies (set as the voltage source). That is, only a single dc power source is subjected to the current variation. In other words, although such a structure is intuitively easy to design, it may actually cause a considerable burden on the dc power source, which reduces the lifetime of the dc power source and even causes a danger.
Disclosure of Invention
The present invention provides a power supply system and a control method thereof, so as to overcome the problem that the structure of the conventional power supply system bears too much load when the load condition of each dc power source changes.
The invention discloses a control method of a power supply system. The control method of the power supply system is suitable for 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 comprises the following steps: obtaining the current magnitude of a first current provided by the first voltage source; generating a control signal according to the difference value between the current magnitude of the first current and a reference current value; adjusting the current of the first current by the first voltage source according to the control signal; and adjusting the current of the second current by the second voltage source 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. The 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 used for providing a first current. The processing circuit is electrically connected to the first power supply circuit. The processing circuit is used for generating a control signal according to the difference value of the current magnitude of the first current and a reference current value. The first power supply circuit is used for adjusting 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 used for providing a second current, and the second power supply circuit is used for adjusting the current of the second current according to the control signal.
The foregoing summary of the invention, as well as the following detailed description of the embodiments, is provided to illustrate and explain the principles and spirit of the invention, and to provide further explanation of the invention as claimed.
Drawings
Fig. 1 is a flowchart illustrating 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.
Fig. 4 is a functional block diagram of a power supply system according to another embodiment of the invention.
Fig. 5 is a functional block diagram of a power supply system according to another embodiment of the invention.
Fig. 6 is a functional block diagram of a power supply system according to another embodiment of the invention.
Wherein, the reference numbers:
1. 2, 3 power supply system
12. 22, 32 first voltage source
122. 222, 322 first power supply circuit
124. 224, 324 processing circuit
2242. 3242 Compensation sub-Circuit
2244. 3244 arithmetic sub-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
Detailed Description
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for those skilled in the art to understand the technical contents of the present invention and to implement the same, and the related objects and advantages of the present invention can be easily understood by those skilled in the art from the disclosure of the present specification, claims and drawings. The following examples further illustrate aspects of the present invention in detail, but are not intended to limit the scope of the present invention in any way.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for controlling a power supply system according to an embodiment of the invention. The control method of the power supply system is suitable for 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 comprises the following steps: in step S101, a current magnitude of a first current provided by the first voltage source is obtained; in step S103, a control signal is generated according to a difference between the magnitude of the first current and a reference current value; in step S105, adjusting the current magnitude of the first current by the first voltage source according to the control signal; in step S107, the second voltage source adjusts the current magnitude of the second current according to the control signal.
Based on the control method, the invention also provides various power supply systems. 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 for providing power to the load L. In practice, the first voltage source 12 can be set as an active controller (master) and the second voltage source 14 can be set as a passive controller (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 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 a single second voltage source 14 is described later, but the architecture of the power supply system 1 is not limited by way of example.
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 used for providing a first current. The processing circuit 124 is configured to generate a control signal according to a difference between the magnitude of the first current and a reference current value. The first power supply circuit 122 is configured to adjust a current level of the first current according to the control signal.
In practice, the power supply system 1 has a detection circuit to obtain the current magnitude of the first current for the processing circuit 124, for example, the detection circuit is a machine independent from the first voltage source 12, or the detection circuit can be a component of the voltage source 12 itself, which is not limited herein.
On the other hand, in an embodiment, the control signal records, for example, a difference between a current magnitude of the first current and a reference current value. From another perspective, the control signal is used to indicate the relative magnitude of the first current and the reference current, for example. When the magnitude of the first current is larger 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 smaller than the reference current value, the first power supply circuit 122 adjusts the magnitude of the first current according to the control signal. When the magnitude 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 to fig. 2 again, the second voltage source 14 includes a second power supply circuit 142. As previously described, the second voltage source 14 is connected in series with the first voltage source 12. From another perspective, the second power supply circuit 142 of the second voltage source 14 is connected in series with the first power supply circuit 122 of the first voltage source 12.
In addition, the second voltage source 14 is electrically connected to the processing circuit 124 of the first voltage source 12. The second power supply circuit 142 is used for providing a second current, and the second power supply circuit 142 is used for adjusting the current magnitude 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 magnitude of the first current is larger than the reference current value, the second power supply circuit 142 adjusts the magnitude of the second current according to the control signal. When the current magnitude of the second current is smaller than the reference current value, the second power supply circuit 142 adjusts the magnitude of the second current according to the control signal. When the magnitude 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 power ratings of the first voltage source 12 and the second voltage source 14 are the same, so when the first power supply circuit 122 and the second power supply circuit 142 are controlled by the same control signal, the magnitude of the first current provided by the first power supply circuit 122 is the same as the magnitude 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 adjusts the second current accordingly.
Referring 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 the 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 adjustable current source IS. The resistor R IS an equivalent resistor in the first power supply circuit 122, and the adjustable current source IS controlled by the processing circuit 124. More specifically, the adjustable current source IS generates an output current according to a control signal provided by the processing circuit 124. Part of the output current is output as the first current to the outside of the first power supply circuit 122, and another part of the output current flows through the resistor R to generate a cross voltage. In other words, the processing circuit 124 adjusts the current magnitude of the first current and adjusts the voltage across the first power supply circuit 122 by instructing the adjustable current source IS.
The second power supply circuit 142 may be equivalent to the circuit model similar to the first power supply circuit 122. Therefore, when the first power supply circuit 122 and the second power supply circuit 142 have similar equivalent resistance and similar adjustable current sources, because the first power supply circuit 122 and the second power supply circuit 142 are controlled by the control signal provided by the processing circuit 124, the first power supply circuit 122 and the second power supply circuit 142 provide similar output current and have similar voltage steps, so that the system is stable and the first power supply circuit 122 and the second power supply circuit 142 are in a voltage-sharing state. In another aspect, when the voltage or current of the load L varies, the variation is evenly distributed to the first voltage source 12 and the second voltage source 14, and is not borne by the first voltage source 12 and the second voltage source 14 as in the prior art.
Referring to fig. 4, fig. 4 is a functional block diagram of a power supply system according to another embodiment of the invention. In this embodiment, the circuit architecture of the power supply system 2 is similar to that of the power supply system 1, and details thereof are not repeated. In contrast, 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 used for generating a comparison signal according to a difference value between the first current and the reference current. In practice, the operation sub-circuit 2244 is, for example, a subtractor or an adder. The compensation sub-circuit 2242 is used for forming 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 perform an operation according to the parameter values of the first current and the reference current, and the compensation sub-circuit 2242 is configured to convert the operation result of the operation sub-circuit into a command pattern acceptable to the back end. In one embodiment, the compensation sub-circuit 2242 is further configured to adjust the control signal to stabilize the system.
Referring to fig. 5, fig. 5 is a functional block diagram of a power supply system according to another embodiment of the 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 used for forming a first compensation signal according to a first weight gain adjustment control signal. The second gain circuit 346 is for adjusting the control signal according to a second weight gain to form a second compensation signal. The second power supply circuit 342 is used for adjusting the current magnitude of the second current according to the second compensation signal. The first weight gain is the ratio of the first rated power to the power sum of the first rated power and the second rated power, and the second weight gain is the ratio of the second rated power to the power sum of the first rated power and the second rated power. From another perspective, the first weight gain is a value of the first rated power divided by a power sum of the first rated power and the second rated power, and the second weight gain is a value of the second rated power divided by a power sum of the first rated power and the second rated power.
By properly adjusting the first current and the second current with the first weight gain and the second weight gain, the voltage sharing between the first voltage source 32 and the second voltage source 34 can be maintained even though the first rated power of the first voltage source 32 is different from the second rated power of the second voltage source 34. In addition, as mentioned above, when the voltage or the current of the load L varies, the voltage variation or the current variation is evenly distributed to the first voltage source 32 and the second voltage source 34, and is not assumed by the first voltage source 32 and the second voltage source 34 as before.
Referring to fig. 6, fig. 6 is a functional block diagram of a power supply system according to another embodiment of the invention. The power supply system 1' in the embodiment shown in fig. 6 is similar in structure to the power supply system 1 in fig. 2. The difference is that the power supply system 1 ' has 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 sources 14a ', 14b ' are in series relation on the power circuit. That is, the first voltage source 12 ' may be connected in series between the second voltage sources 14a ', 14b ', or the first voltage source 12 ' may be connected in series with the second voltage sources 14a ', 14b ' but only electrically connected to the second voltage source 14b ', which is not limited herein.
By this embodiment, a case that the power supply system has a plurality of second power supply circuits is clearly illustrated. As previously described, the first voltage source 12 ' and the second voltage sources 14a ', 14b ' may be the same specification voltage sources. That is, the power supply system 1 'has a plurality of identical voltage sources, and controls all the voltage sources in the power supply system 1' according to the current magnitude of the current provided by one of the voltage sources. In one embodiment, the first voltage source 12 ' may be set as an active controller (master) and the second voltage sources 14a ', 14b ' may be set as passive controllers (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 connected to the processing circuit 124'. The first power supply circuit 122' is used for providing a first current. The processing circuit 124' is used for generating 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 used for adjusting the current magnitude of the first current according to the control signal. On the other hand, the second voltage sources 14a ', 14 b' adjust the current magnitude of the second current according to the control signal as described above. In practice, each voltage source in fig. 6 may have the same implementation as that in fig. 3, fig. 4, and fig. 5, and the details thereof are not repeated herein.
In summary, the present invention provides a power supply system and a control method thereof, which generate a corresponding control signal to adjust the output current of other voltage sources by the output current of one of a plurality of voltage sources connected in series. Therefore, each voltage source can be adjusted to be voltage-sharing, and the related circuit architecture and the control method are not only simple and accurate, but also have practicability.
Although the present invention has been described with reference to the above embodiments, it is not intended to limit the invention. All changes and modifications that come within the spirit and scope of the invention are desired to be protected by the following claims. With regard to the scope of protection defined by the present invention, reference should be made to the appended claims.
Claims (5)
1. A control method of a power supply system is suitable for a power supply system, and is characterized in that the power supply system comprises a first voltage source and a second voltage source which are connected in series, and the control method of the power supply system comprises the following steps:
obtaining a current magnitude of a first current provided by the first voltage source;
generating a control signal according to the difference value between the current magnitude of the first current and a reference current value;
adjusting the current of the first current by the first voltage source according to the control signal; and
the second voltage source adjusts a second current provided by the second voltage source according to the control signal.
2. The method as claimed in 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 is different from the second rated power, and the step of adjusting the magnitude of the first current by the first voltage source according to the control signal further comprises:
adjusting the control signal according to a first weight gain to generate a first compensation signal, wherein the first weight gain is a ratio of the first rated power divided by a power sum of the first rated power and the second rated power;
adjusting the current magnitude of the first current by the first voltage source according to the first compensation signal; and the step of adjusting the current magnitude of a second current provided by the second voltage source according to the control signal by the second voltage source further comprises:
adjusting the control signal according to a second weight gain to generate a second compensation signal, wherein the second weight gain is the ratio of the second rated power divided by the sum of the first rated power and the second rated power;
and adjusting the current magnitude of the second current by the second voltage source according to the second compensation signal.
3. A power supply system, comprising:
a first voltage source comprising:
a first power supply circuit for providing a first current; and
the processing circuit is electrically connected with the first power supply circuit and used for generating a control signal according to the difference value between the current magnitude of the first current and a reference current value, and the first power supply circuit is used for adjusting the current magnitude of the first current according to the control signal; and
the second voltage source is connected in series with the first voltage source and is electrically connected with the processing circuit, the second voltage source comprises a second power supply circuit, the second power supply circuit is used for providing a second current, and the second power supply circuit is used for adjusting the current of the second current according to the control signal.
4. The power supply system of claim 3, wherein the processing circuit comprises:
an operation sub-circuit electrically connected to the first power supply circuit, the operation sub-circuit generating a comparison signal according to a difference between the first current and the reference current; and
a compensation sub-circuit electrically connected to the operation sub-circuit, the compensation sub-circuit being used to form the control signal according to the comparison signal.
5. The power supply system of claim 3, wherein the first voltage source has a first power rating, the second voltage source has a second power rating, the first power rating is different from the second power rating, wherein the first voltage source further comprises a first gain circuit, the second voltage source further comprises a second gain circuit, the first gain circuit is electrically connected to the processing circuit and the first power supply circuit, the first gain circuit is used for adjusting the control signal according to a first weight gain to form a first compensation signal, the second gain circuit is electrically connected to the processing circuit and the second power supply circuit, and is used for adjusting the control signal according to a second weight gain to form a second compensation signal, the second power supply circuit is used for adjusting the current of the second current according to the second compensation signal;
the first weight gain is a ratio of the first rated power divided by a power sum of the first rated power and the second rated power, and the second weight gain is a ratio of the second rated power divided by a power sum of the first rated power and the second rated power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711383662.1A CN109947161B (en) | 2017-12-20 | 2017-12-20 | Power supply system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711383662.1A CN109947161B (en) | 2017-12-20 | 2017-12-20 | Power supply system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109947161A CN109947161A (en) | 2019-06-28 |
| CN109947161B true CN109947161B (en) | 2020-08-28 |
Family
ID=67004156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711383662.1A Active CN109947161B (en) | 2017-12-20 | 2017-12-20 | Power supply system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109947161B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5764503A (en) * | 1994-11-30 | 1998-06-09 | Digital Equipment Corporation | Method and apparatus for providing conditioned AC voltage using current and voltage sensing |
| CN1159632C (en) * | 2002-03-28 | 2004-07-28 | 艾默生网络能源有限公司 | Constant current and voltage regulator and electricity recharger using said regulator |
| TWI315457B (en) * | 2006-06-30 | 2009-10-01 | Mstar Semiconductor Inc | Power supply apparatus and method for providing voltage |
| CN101674016B (en) * | 2009-10-01 | 2012-01-11 | 旭丽电子(广州)有限公司 | Power supply device and current sharing control method |
| TWI552473B (en) * | 2013-03-07 | 2016-10-01 | Good Will Instr Co Ltd | Parallel system of DC power supply and its control method |
| CN105990999A (en) * | 2015-01-27 | 2016-10-05 | 台达电子工业股份有限公司 | Power supply device and control method thereof |
| CN105990896A (en) * | 2015-02-13 | 2016-10-05 | 深圳市华思旭科技有限公司 | Power supply control circuit, mobile power supply and electric connection device |
| CN105490346B (en) * | 2016-01-07 | 2018-01-05 | 深圳市国电赛思科技有限公司 | Pressure equalizing control method and system for tandem compound power supply |
| CN106452068B (en) * | 2016-10-14 | 2019-09-27 | 哈尔滨工业大学深圳研究生院 | A kind of concatenated pressure equalizing control method of DC/DC converter input series connection output |
| CN206259743U (en) * | 2016-10-28 | 2017-06-16 | 深圳欧陆通电子有限公司 | Cold redundancy controls circuit and redundant power |
| CN206341137U (en) * | 2016-12-18 | 2017-07-18 | 王鲁云 | A kind of asynchronous serial switching power unit |
-
2017
- 2017-12-20 CN CN201711383662.1A patent/CN109947161B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109947161A (en) | 2019-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2015158B1 (en) | Paralleling voltage regulators | |
| TWI578144B (en) | Digital voltage compensation for power supply integrated circuits | |
| US5444358A (en) | Power supply shunt regulator with current limitation circuit therein | |
| EP1148609A2 (en) | Fault tolerant active current sharing | |
| US10411586B2 (en) | Circuit and method for overcurrent control and power supply system including the same | |
| US10061334B2 (en) | Voltage regulator | |
| CN110647203B (en) | Voltage regulation circuit with individually enabled control loops | |
| CN111864722A (en) | Current-sharing control circuit, power supply system and current-sharing control method | |
| JP2008197892A (en) | Series regulator | |
| KR20060064648A (en) | Power supply control loop with multiple leveling modes | |
| US10707748B2 (en) | Control device for DC converter, DC converter, and method for controlling a DC converter | |
| CN105745593A (en) | Apparatus and method for reacting to a change in supply voltage | |
| KR102021415B1 (en) | Voltage generator circuit | |
| CN109947161B (en) | Power supply system and control method thereof | |
| EP1107417A2 (en) | Circuit and method for generating estimated feedback for the controller of a slave power supply module in a master/slave paralleling scheme | |
| TWI658669B (en) | Power supply system and control method for power supply system | |
| US20180212691A1 (en) | Semiconductor integrated circuit, semiconductor system, and electric source voltage control method | |
| JP5015905B2 (en) | Multi-parallel power supply | |
| CN112039045B (en) | Power load distribution system | |
| US6768786B2 (en) | Circuit arrangement and method for generating an x-ray tube voltage | |
| JP6641208B2 (en) | Input voltage controller | |
| KR20170122412A (en) | Capacitorless low drop out regulator and controlling circuit therefor | |
| KR102058486B1 (en) | Load sharing controller having offset circuit for load sharing control between plural power supply unit and parallel power supply system | |
| CN109728577B (en) | Power supply system and control method thereof | |
| CN202904411U (en) | Semiconductor equipment and heater power supply control system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |