阅读说明：本技术 供电系统 (Power supply system ) 是由 张世杰 于 2019-01-03 设计创作，主要内容包括：本案提供一种供电系统,包含电源供应器集成、辅助电源电路及控制单元,电源供应器集成于输入电源正常时转换输入电源为第一直流电能。辅助电源电路的至少一储能单元提供第二直流电能。辅助电源电路的至少一第一电能转换器电连接于至少一储能单元及负载之间,转换第二直流电能为个别辅助电能,以使辅助电源电路藉由至少一个别辅助电能提供总辅助电能。控制单元于输入电源正常且负载所需的瞬时功率大于电源供应器集成输出的输出功率的额定上限值时,驱动辅助电源电路输出总辅助电能,以补偿瞬时功率及额定上限值之间的差值。(The power supply system comprises a power supply integration, an auxiliary power circuit and a control unit, wherein the power supply integration converts an input power into first direct current electric energy when the input power is normal. At least one energy storage unit of the auxiliary power supply circuit provides second direct current electric energy. The at least one first power converter of the auxiliary power circuit is electrically connected between the at least one energy storage unit and the load, and converts the second direct current power into individual auxiliary power, so that the auxiliary power circuit provides total auxiliary power by the at least one individual auxiliary power. When the input power supply is normal and the instantaneous power required by the load is greater than the rated upper limit value of the output power integrated and output by the power supply, the control unit drives the auxiliary power supply circuit to output the total auxiliary electric energy so as to compensate the difference between the instantaneous power and the rated upper limit value.)

1. A power supply system, comprising:

the power supply integration is electrically connected between an input power supply and a load and converts the input power supply into first direct current electric energy when the input power supply is normal;

a first auxiliary power circuit electrically connected between the power supply assembly and the load, comprising:

at least one first energy storage unit for providing a second direct current electric energy; and

at least one first power converter electrically connected between the at least one first energy storage unit and the load for converting the second direct current power into a first individual auxiliary power, so that the first auxiliary power circuit provides a first total auxiliary power by the at least one first individual auxiliary power; and

and the control unit drives the first auxiliary power supply circuit to output the first total auxiliary electric energy to compensate a difference value between the first instantaneous power and the first rated upper limit value when the input power supply is normal and the first instantaneous power required by the load is greater than the first rated upper limit value of the output power integrated and output by the power supply.

2. The power supply system of claim 1 further comprising a detection circuit for detecting an output power outputted by the power supply and a power parameter of the load, wherein the control unit determines whether the first instantaneous power required by the load is greater than the first upper limit value according to a detection result of the detection circuit.

3. The power supply system of claim 2 wherein the power parameter comprises a magnitude of voltage, current or power required by the load.

4. The power supply system of claim 1, wherein the first auxiliary power circuit comprises a plurality of first energy storage units and a plurality of first power converters, each of the first power converters is electrically connected between the corresponding first energy storage unit and the load, and the control unit drives a corresponding number of the first power converters to operate according to the first instantaneous power required by the load and the difference between the first upper limit value and the first upper limit value.

5. The power supply system of claim 4, wherein the auxiliary power circuit comprises a plurality of first current sharing circuits, each of the first current sharing circuits is electrically connected to the corresponding first power converter for adjusting the current value outputted by the corresponding first power converter to be equal to the current value outputted by the other first power converters.

6. The power supply system of claim 1 wherein the power supply assembly comprises a plurality of power supplies connected in parallel, each power supply comprising:

a second power converter for converting the input power into the first DC power; and

and the second current equalizing circuit is electrically connected with the second electric energy converter and adjusts the current value output by the second electric energy converter to be equal to the current values output by other power supplies.

7. The power supply system of claim 1, wherein when the input power is abnormal, the power supply integration stops operating, and the control unit drives the first auxiliary power circuit to provide the first total auxiliary power to power the load.

8. The power supply system of claim 1 wherein the first power converter is a bi-directional converter.

9. The power supply system of claim 1 further comprising a second auxiliary power circuit electrically connected between the power supply assembly and the load for providing a second total auxiliary power, the second auxiliary power circuit comprising at least one second energy storage unit, wherein the power density of the at least one first energy storage unit is greater than the power density of the at least one second energy storage unit and/or the energy density of the at least one second energy storage unit is greater than the energy density of the at least one first energy storage unit.

10. The power supply system of claim 9 wherein the power supply integration is disabled when the input power is abnormal, the control unit drives the second auxiliary power circuit to provide the second total auxiliary power to power the load, and the control unit drives the first auxiliary power circuit to provide the first total auxiliary power to compensate for the difference between the second instantaneous power and the second nominal upper limit when a second instantaneous power required by the load is greater than the second nominal upper limit of the output power output by the second auxiliary power circuit.

11. A power supply system, comprising:

the power supply integration is electrically connected between an input power supply and a load and converts the input power supply into first direct current electric energy when the input power supply is normal;

a first auxiliary power supply circuit electrically connected between the power supply integration and the load for providing a first total auxiliary power;

a second auxiliary power supply circuit electrically connected between the power supply integration and the load for providing a second total auxiliary power; and

and the control unit selectively drives at least one of the first auxiliary power circuit and the second auxiliary power circuit to correspondingly output at least one of the first total auxiliary electric energy and the second total auxiliary electric energy when the input power supply is normal and a first instantaneous power required by the load is greater than a first rated upper limit value of the output power integrated and output by the power supply so as to compensate a difference value between the first instantaneous power and the first rated upper limit value.

12. The power supply system of claim 11 wherein the first and second auxiliary power circuits respectively comprise at least one first and at least one second energy storage unit, the at least one first energy storage unit having a power density greater than the at least one second energy storage unit and/or the at least one second energy storage unit having a power density greater than the at least one first energy storage unit.

13. The power supply system of claim 12, wherein the control unit drives the first auxiliary power circuit to provide the first total auxiliary power to compensate for the difference between the first instantaneous power and the first rated upper limit according to the magnitude of the difference between the first instantaneous power required by the load and the rated upper limit.

14. The power supply system of claim 13 wherein the second auxiliary power circuit is driven to provide the second total auxiliary power to compensate for the first total auxiliary power deficiency when the first total auxiliary power is insufficient to compensate for the difference between the first instantaneous power and the first nominal upper limit.

15. The power system of claim 12, wherein when the input power is abnormal, the power supply integration stops operating, and the control unit drives the second auxiliary power circuit to provide the second total auxiliary power to maintain the energy required by the load.

16. The power supply system of claim 15 wherein when the input power is abnormal and a second instantaneous power demanded by the load is greater than a second upper limit of the output power outputted by the second auxiliary power circuit, the control unit drives the first auxiliary power circuit to provide the first total auxiliary power to compensate for the difference between the second instantaneous power and the second upper limit.

Technical Field

The present invention relates to a power supply system, and more particularly, to a power supply system that compensates instantaneous power required by a load using an auxiliary power circuit.

Background

In response to the increasing demand for large data centers, there is a need to provide a stable power supply system that can supply power to a large data center without power failure in order to avoid the possibility of serious data corruption in the large data center.

The uninterruptible power system is different from an emergency power system or a backup generator, and is usually powered by a power supply, and combines the energy of a stored energy device to provide instant protection for the interruption of an input power source. When the ac/dc power supply is normal (e.g., the utility power is stably output), the power supply provides a stable power to the load (e.g., a data center), and when the ac/dc power supply fails (e.g., the utility power is cut off), another energy storage device is needed to provide the energy required by the load.

In the conventional uninterruptible power system combining the power supply and the backup device, the maximum energy output values of the power supply and the backup device are limited, so that when the system load requires that the power supply provide instantaneous power which is larger than the power which can be provided by the power supply at ordinary times, the power supply is shut down due to overload, then the backup device starts to supply overload current, so that the service life of the battery is shortened, and the backup device has no converter current sharing design, so that the backup device is accelerated and unbalanced and aging factors.

Therefore, there is a need to provide an improved power supply system to solve the above problems of the prior art.

Disclosure of Invention

The present disclosure provides a power supply system, which utilizes an auxiliary power circuit to compensate instantaneous power required by a load, thereby avoiding an integrated overload of a power supply without increasing production cost, and further prolonging the service life of a battery in the auxiliary power circuit.

To achieve the above objective, a power supply system according to a broader aspect of the present disclosure includes a power supply integration, a first auxiliary power circuit, and a control unit. The power supply is electrically connected between the input power supply and the load, and converts the input power supply into first direct current electric energy when the input power supply is normal. The first auxiliary power circuit is electrically connected between the power supply integration and the load and comprises at least one first energy storage unit and at least one first electric energy converter. The at least one first energy storage unit provides second direct current electric energy. The at least one first power converter is electrically connected between the at least one first energy storage unit and the load, and converts the second direct current power into first individual auxiliary power, so that the first auxiliary power circuit provides first total auxiliary power by the at least one first individual auxiliary power. When the input power supply is normal and the first instantaneous power required by the load is greater than the first rated upper limit value of the output power of the power supply integration output, the control unit drives the first auxiliary power supply circuit to output first total auxiliary electric energy so as to compensate the difference between the first instantaneous power and the first rated upper limit value.

To achieve the above object, another broad aspect of the present invention provides a power supply system, comprising: the power supply device comprises a power supply integration, a first auxiliary power supply circuit, a second auxiliary power supply circuit and a control unit. The power supply is electrically connected between the input power supply and the load, and converts the input power supply into first direct current electric energy when the input power supply is normal. The first auxiliary power supply circuit is electrically connected between the power supply integration and the load and provides first total auxiliary electric energy. The second auxiliary power supply circuit is electrically connected between the power supply integration and the load and provides second total auxiliary electric energy. When the input power supply is normal and the first instantaneous power required by the load is greater than the first rated upper limit value of the output power of the power supply integration output, the control unit selectively drives at least one of the first auxiliary power supply circuit and the second auxiliary power supply circuit to correspondingly output at least one of the first total auxiliary power and the second total auxiliary power so as to compensate the difference value between the first instantaneous power and the first rated upper limit value.

Drawings

Fig. 1 is a schematic circuit structure diagram of a power supply system according to a first preferred embodiment of the disclosure.

Fig. 2 is a schematic circuit structure diagram of a power supply system according to a second preferred embodiment of the disclosure.

Wherein the reference numerals

P: input power supply

L load

2. 3: power supply system

21. 31: power supply integration

211. 311: power supply

212. 312: AC/DC converter

213. 313: DC/DC converter

214. 224, 314: current equalizing circuit

215. 223, 315, 325: switch with a switch body

216. 222, 316, 322, 324: electric energy converter

22: auxiliary power supply circuit

32 a: first auxiliary power supply circuit

321: first energy storage unit

323: second energy storage unit

32 b: second auxiliary power supply circuit

221: energy storage unit

23. 33: control unit

231. 331: detection circuit

D: direct current bus

Detailed Description

Exemplary embodiments that embody features and advantages of this disclosure are described in detail below in the detailed description. It will be understood that the present disclosure is capable of various modifications without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

Referring to fig. 1, a schematic circuit diagram of a power supply system according to a first preferred embodiment of the present invention is shown, in which a power supply system 2 of the present invention is electrically connected between an input power source P and a load L, where the input power source P is, for example, a commercial power for providing ac power, but not limited thereto, in some embodiments, the input power source P may be selected from one or a combination of more than two of a solar panel, a fuel cell, a flywheel, a generator and a renewable energy source for providing dc power, the power supply system 2 includes a power supply assembly 21, an auxiliary power circuit 22 and a control unit 23, the power supply assembly 21 is electrically connected to the input power source P and electrically connected to a load L through a dc bus D for receiving the input power source P when the input power source P is normal and converting the input power source P to output a first dc power to the load L to drive the load L to operate.

The auxiliary power circuit 22 is electrically connected to the power supply assembly 21 and the load L through a dc bus D, and is capable of providing a total auxiliary power to the load L during operation, and the auxiliary power circuit 22 includes at least one energy storage unit 221 and at least one power converter 222, which are plural in this embodiment but not limited thereto, each energy storage unit 221 is configured to provide a second dc power, each power converter 222 is electrically connected between the corresponding energy storage unit 221 and the load L, and is configured to receive and convert the second dc power provided by the corresponding energy storage unit 221 into a separate auxiliary power during operation, so that the auxiliary power circuit 22 provides the total auxiliary power to the load L by the separate auxiliary power output by the power converter 222.

In some embodiments, the number of the energy storage units 221 and the power converters 222 included in the auxiliary power circuit 22 is such that the plurality of control units 23 are used to drive the plurality of power converters 222 to operate and output a plurality of corresponding individual auxiliary powers when the input power P is abnormal, so that the auxiliary power circuit 22 utilizes the individual auxiliary powers output by the plurality of power converters 222 to generate a total auxiliary power to the load L, thereby providing a backup function.

In addition, the control unit 23 is further configured to determine whether the instantaneous power required by the load L is greater than the rated upper limit of the output power output by the power supply assembly 21 when the power supply assembly 21 is operating (i.e., the input power P is normal), and determine whether to drive the auxiliary power circuit 22 according to the determination result, when the instantaneous power required by the load L is greater than the rated upper limit of the output power output by the power supply assembly 21, the control unit 23 drives the auxiliary power circuit 22 to operate, and meanwhile, the control unit 23 determines the magnitude of the difference between the instantaneous power required by the load L and the rated upper limit to calculate how many energy storage units 221 should compensate the difference, so that the control unit 23 drives the corresponding number of energy converters 222 to operate, and the energy converters 222 respectively convert the corresponding energy storage units 221 into the respective auxiliary energy, so that the auxiliary power circuit 22 compensates the difference between the instantaneous power required by the load L and the rated upper limit by using the respective auxiliary energy output by the operating energy converters 222.

In some embodiments, the power supply system further includes a detection circuit 231 for detecting the output power outputted by the power supply assembly 21 and the power parameter of the load L, such as the voltage, current or power required by the load L, so as to obtain the instantaneous power required by the load L, and transmitting the detected data to the control unit 23 as a basis for control or determination.

Further, when the input power P is normal, for example, the utility grid stably provides power, the power supply integration 21 operates to supply the load L with the first dc power output by the power supply integration 21, when the control unit 23 determines, according to the detection result of the detection circuit 231, that the instantaneous power required by the load L is greater than the rated upper limit of the output power that can be output by the power supply integration 21, the control unit 23 drives the auxiliary power circuit 22 to output the total auxiliary power to compensate the difference between the instantaneous power required by the load L and the rated upper limit by using the total auxiliary power, in some embodiments, the control unit 23 drives the corresponding number of power converters 222 to operate according to the difference between the instantaneous power required by the load L and the rated upper limit, so as to generate the total auxiliary power output by the auxiliary power circuit 22 by using the respective auxiliary powers output by the corresponding number of power converters 222 during operation.

On the other hand, when the input power P is normal and the power supply module 21 is running, if the control unit 23 determines that the instantaneous power required by the load L is less than or equal to the rated upper limit of the output power output by the power supply module 21, the power supply module 21 can supply the power required by the load L, so that the control unit 23 does not need to further drive the auxiliary power circuit 22 to output the total auxiliary power.

When the input power P is abnormal, for example, the power failure, voltage drop, surge, continuous under-voltage/overvoltage, line noise, etc. occur in the utility grid, the power supply integration 21 stops operating, and the control unit 23 drives the at least one power converter 222 to operate to output the total auxiliary power to the load L, and then restarts the power supply integration 21 and selectively drives the auxiliary power circuit 22 according to the power required by the load L until the input power P returns to normal.

As can be seen from the above, the auxiliary power circuit 22 of the power supply system 2 of the present disclosure can operate the power converter 222 when the instantaneous power required by the load L is greater than the rated upper limit of the output power output by the power supply integration 21, so as to actively make the total auxiliary power output by the auxiliary power circuit 22 compensate for the difference between the instantaneous power required by the load L and the rated upper limit, in this way, without increasing the power that can be output by the power supply integration 21 or increasing the number of the energy storage units 221 in the auxiliary power circuit 22, the power supply integration 21 is not overloaded and is shut down, so that the energy storage unit 221 in the auxiliary power circuit 22 needs to supply the overload power to the load L, thereby prolonging the service life of the energy storage unit 221 and simultaneously avoiding increasing the production cost of the power supply system 2 of the present disclosure.

In some embodiments, the power converter 222 is a bidirectional converter, in other words, the auxiliary power circuit 22 can convert the first dc power output by the power supply integration 21 into the second dc power by the power converter 222 and store the second dc power in the energy storage unit 221, and convert the second dc power stored in the energy storage unit 221 into the respective auxiliary power by the power converter 222 to be provided to the load L.

In some embodiments, the power supply assembly 21 may include at least one power supply 211, which is a plurality in the present embodiment, but not limited thereto. The plurality of power supplies 211 are connected in parallel, and each power supply 211 includes a current share circuit 214, a switch 215, and a power converter 216. The power converter 216 is configured to convert the input power P into a first dc power. In the present embodiment, the power converter 216 includes an ac/dc converter 212 and a dc/dc converter 213. The ac/dc converter 212 is electrically connected to the input power source P for receiving and converting ac power into dc transition power when the input power source P provides ac power. The dc/dc converter 213 is electrically connected to the ac/dc converter 212 for receiving and converting the dc transitional power to output a first dc power. In some embodiments, the power converter 216 may not include the dc/dc converter 213, and only directly converts the received ac power into the first dc power through the ac/dc converter 212. In some embodiments, if the input power source P provides dc power, the power supply 211 may not include the ac/dc converter 212, and only directly convert the received dc power into the first dc power through the dc/dc converter 213.

The current sharing circuit 214 is electrically connected to the power converters 216 for adjusting the current value output by the corresponding power converter 216 to be equal to the current value output by the other power converters 216, so that the plurality of power supplies 211 achieve the current sharing effect by using the current sharing circuit 214. each switch 215 is electrically connected between the corresponding current sharing circuit 214 and the load L for being turned off when the power supply 211 stops operating and turned on when the power supply 211 operates, so that the first dc power output by each power supply 211 can be transmitted to the load L through the corresponding switch 215.

Referring to fig. 1, in other embodiments, the auxiliary power circuit 22 further includes at least one switch 223, each switch 223 is electrically connected between the corresponding power converter 222 and the load L, and is controlled by the control unit 23 to perform an on/off switching operation, when the power converter 222 operates to charge the energy storage unit 221 or the energy storage unit 221 outputs the respective auxiliary power, the control unit 23 controls the corresponding switch 223 to perform the on/off switching operation.

In some embodiments, the auxiliary power circuit 22 further includes at least one current sharing circuit 224, each current sharing circuit 224 is electrically connected between the corresponding power converter 222 and the corresponding switch 223, and is configured to adjust a current value of the respective auxiliary power outputted by the corresponding power converter 222 to be equal to a current value of the respective auxiliary power outputted by the other power converters 222, so as to perform current sharing, and thus the current value of the respective auxiliary power outputted by any one operating power converter 222 is equal to the current value of the respective auxiliary power outputted by the other operating power converters 222, thereby achieving the effect of current sharing.

In some embodiments, when the load L has an instantaneous high power requirement (i.e., the power supply integration 21 cannot meet the power requirement of the load L), the sum of the output current provided by each current share unit 214 and the output current provided by each current share unit 224 is current shared, i.e., the current output by the current share units 214 is substantially equal to the current output by the current share units 224, so that the current share units can share the output current drawn by the load L. in some embodiments, the current share units 224 can also adjust the current output by the current share units 214 according to the magnitude of the load L. that is, the current output by the current share units 214 can be different from the current output by the current share units 224.

Please refer to fig. 2, which is a schematic circuit diagram of a power supply system according to a second preferred embodiment of the present disclosure, wherein the structure and function of components of the power supply system 3 in this embodiment are similar to those of the power supply system 2 shown in fig. 1, and the same reference numerals denote similar component structures and functions, which are not repeated herein, the power supply system 3 includes a first auxiliary power circuit 32a and a second auxiliary power circuit 32b, the first auxiliary power circuit 32a and the second auxiliary power circuit 32b are electrically connected to a load L and a power supply assembly 31 via a dc bus D, the first auxiliary power circuit 32a includes at least one first energy storage unit 321 and a plurality of power converters 322 connected to the corresponding first energy storage unit 321, in this embodiment, but not limited thereto, each first energy storage unit 321 provides a first auxiliary power through the corresponding power converter 322, so that the first auxiliary power circuit 32a generates a first auxiliary power to the load L through a first auxiliary power output from the at least one power converter 322, and the second auxiliary power converter 324 b generates a second auxiliary power through a second auxiliary power converter 323 and a second auxiliary power converter 324 b, so that the second auxiliary power converter 324 b generates a second auxiliary power output from at least one corresponding auxiliary power converter 323 and a second auxiliary power converter 324 b.

In some embodiments, the power density of the first energy storage unit 321 is greater than the power density of the second energy storage unit 323. In some embodiments, the energy density of the first energy storage unit 321 is less than the energy density of the second energy storage unit 323. For example, the first energy storage unit 321 may be, for example, but not limited to, a super capacitor; the second energy storage unit 323 may be, for example, but not limited to, a battery.

When the input power P supplies power normally, the power supply assembly 31 operates and outputs a first dc power to power the load L. the circuit structure and operation of the power supply assembly 31 are similar to those of the power supply assembly 21 shown in fig. 1, and will not be described herein again, when the control unit 33 determines that the instantaneous power required by the load L is greater than the upper limit of the rated output power that can be output by the power supply assembly 31 (e.g., the control unit 33 determines according to the detection result of the detection circuit 331), the control unit 33 can preferentially drive the power converter 322 of the first auxiliary power circuit 32a of the first energy storage unit 321 with a greater power density to output a first total auxiliary power to compensate for the difference between the instantaneous power required by the load L and the upper limit of the rated output power.

In addition, if the power required by the load L exceeds the rated upper limit value that can be output by the power supply assembly 31 continuously after a period of time, and the energy output by the first auxiliary power circuit 32a is not enough to compensate the difference between the power required by the load and the rated upper limit value, the second auxiliary power circuit 32b can drive the power converter 324 to provide the second total auxiliary power to compensate for the insufficient power provided by the first auxiliary power circuit 32 a.

When the input power P is abnormal, the power supply assembly 31 stops operating, and the control unit 33 can preferentially drive the power converter 324 of the second auxiliary power circuit 32b of the second energy storage unit 323 with a larger energy density to output the second total auxiliary power to satisfy the energy required by the load L. on the other hand, when the input power P is abnormal and the second total auxiliary power provided by the second auxiliary power circuit 32b is not enough to supply the load L (i.e., the input power P is abnormal and the instantaneous power required by the load L is greater than the rated upper limit of the power of the second total auxiliary power provided by the second auxiliary power circuit 32 b), the control unit 33 can further drive the first auxiliary power circuit 32a to operate simultaneously, so that the first auxiliary power circuit 32a compensates the additional power required by the load L by using the first total auxiliary power.

Specifically, since the energy density (e.g., the storage capacity) of the second energy storage unit 323 is greater than that of the first energy storage unit 321, when the input power P is abnormal and the backup circuit is needed to provide energy, the second auxiliary power circuit 32b can be selected to provide energy, so as to prolong the duration of the power supply system 3 meeting the requirement of the load L.

In some embodiments, when the input power source P is normal and the load L has a demand for instantaneous high power, the second auxiliary power circuit 32b can be preferentially driven or the first auxiliary power circuit 32a and the second auxiliary power circuit 32b can be simultaneously driven to compensate for the extra power demand of the load L. similarly, when the input power source P is abnormal, the first auxiliary power circuit 32a can be preferentially driven or the first auxiliary power circuit 32a and the second auxiliary power circuit 32b can be simultaneously driven to maintain the power demand of the load L.

In some embodiments, the first auxiliary power circuit 32a and/or the second auxiliary power circuit 32b may also include a current equalizing unit (not shown), which has a function and an operation similar to the current equalizing unit 224 of fig. 2, and is not described herein again. In some embodiments, the first auxiliary power circuit 32a and/or the second auxiliary power circuit 32b may also include at least one switch 325, which has a function and an operation similar to the current equalizing unit 223 of fig. 2, and is not described herein again.

In summary, the auxiliary power circuit of the power supply system of the present disclosure can operate the power converter when the instantaneous power required by the load is greater than the rated upper limit of the output power integrally output by the power supply, so that the total auxiliary power output by the auxiliary power circuit can actively compensate the difference between the instantaneous power required by the load and the rated upper limit. Therefore, under the condition of not increasing the power which can be output by the power supply integration or increasing the number of the energy storage units in the auxiliary power supply circuit, the power supply integration can not be overloaded and shut down, so that the energy storage units in the auxiliary power supply circuit need to supply overload electric energy to a load, the service life of the energy storage units can be prolonged, and meanwhile, the production cost of the power supply system of the scheme is not required to be increased.