CN112271775A - Power supply device and power supply method thereof - Google Patents
Power supply device and power supply method thereof Download PDFInfo
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- CN112271775A CN112271775A CN202011148111.9A CN202011148111A CN112271775A CN 112271775 A CN112271775 A CN 112271775A CN 202011148111 A CN202011148111 A CN 202011148111A CN 112271775 A CN112271775 A CN 112271775A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
- Secondary Cells (AREA)
Abstract
A power supply device and a power supply method thereof are provided. And adjusting the charging power provided by the alternating current power supply to the charging circuit according to the load power provided by the alternating current power supply to the load so as to maintain the total output power of the alternating current power supply below a preset total power. The total output power of the ac power source is equal to the sum of the load power and the charging power.
Description
Cross Reference to Related Applications
The application requires Taiwan area of China, application number 109134281, and invention name submitted in 30/09/2020
Priority of the application in Taiwan area of China for "power supply device and power supply method thereof", the entire contents of which are incorporated by reference
Incorporated in the present application.
Technical Field
The present invention relates to a power supply device, and more particularly, to a power supply device and a power supply method thereof.
Background
Generally, in an off-line energy storage product such as a Uninterruptible Power Supply (UPS)/photovoltaic inverter (PV inverter), if the input/output Power needs to be increased due to hardware limitations, the Power devices in the hardware circuit need to have a higher rated Power, which increases the cost. If power is supplied by short overload output, the temperature rises and power can be supplied only for a short time, so that power required by the load cannot be output for a long time.
Disclosure of Invention
The invention provides a power supply device and a power supply method thereof, which can effectively save hardware cost and improve power utilization efficiency.
The power supply device comprises a battery module, a charging circuit and a control circuit. The charging circuit is coupled with the battery module and the alternating current power supply, wherein the alternating current power supply provides charging power for the charging circuit and provides load power for the load, and the charging circuit charges the battery module. The control circuit is coupled with the charging circuit, and controls the charging circuit to adjust the charging power provided by the alternating current power supply to the charging circuit according to the load power provided by the alternating current power supply to the load, so that the total output power of the alternating current power supply is maintained below a preset total power, wherein the total output power of the alternating current power supply is equal to the sum of the load power and the charging power.
In an embodiment of the invention, the control circuit calculates the load average power according to a plurality of sampled load real-time powers obtained by sampling the load power at the sampling frequency in the latest half cycle time of the ac power source, and adjusts the charging power according to a comparison result between the load average power and the preset power.
In an embodiment of the invention, when the average power of the load is greater than the predetermined power, the control circuit decreases the charging power to maintain the total output power of the ac power supply below the predetermined total power.
In an embodiment of the invention, the update frequency of the load average power is equal to the sampling frequency.
In an embodiment of the invention, the control circuit sets the charging power to the preset charging power when the charging power is lower than the preset charging power.
In an embodiment of the invention, the power supply apparatus further includes a power conversion circuit, coupled to the battery module, for converting a dc voltage provided by the battery module into an ac voltage to supply power to the load when the ac power supply is abnormal. The first switch circuit is coupled with the control circuit, the power conversion circuit and the load. The second switch circuit is coupled with the control circuit, the alternating current power supply and the load, wherein the control circuit turns off the first switch circuit and the second switch circuit when the load power is larger than the preset total power.
The invention also provides a power supply method of the power supply device, which comprises the following steps. Load power supplied by the AC power source to the load and charging power supplied to the charging circuit are detected. The charging circuit is used for charging the battery module, and the charging circuit is used for adjusting the charging power provided by the alternating current power supply to the charging circuit according to the load power provided by the alternating current power supply to the load so that the total output power of the alternating current power supply is kept below a preset total power, and the total output power of the alternating current power supply is equal to the sum of the load power and the charging power.
In an embodiment of the invention, the power supply method of the power supply apparatus further includes the following steps. The load power is sampled at the sampling frequency in the most recent half cycle time of the alternating current power supply to obtain a plurality of sampled load real-time powers. And calculating the load average power according to the plurality of sampled load real-time powers. And adjusting the charging power according to the comparison result of the load average power and a preset power.
In an embodiment of the invention, the power supply method of the power supply apparatus includes reducing the charging power when the average power of the load is greater than the predetermined power, so that the total output power of the ac power supply is maintained below the predetermined total power.
In an embodiment of the invention, the update frequency of the load average power is equal to the sampling frequency.
In an embodiment of the invention, the power supply method of the power supply apparatus includes setting the charging power to a predetermined charging power when the charging power is lower than a predetermined charging power.
In an embodiment of the invention, the ac power supply supplies power to the load through the switch circuit, and the power supply method of the power supply apparatus includes turning off the switch circuit when the load power is greater than the preset total power.
Based on the above, the embodiment of the invention adjusts the charging power provided by the ac power supply to the charging circuit according to the load power provided by the ac power supply to the load, so as to maintain the total output power of the ac power supply below the preset total power, thereby satisfying the load power required by the load, improving the power utilization efficiency without increasing the hardware cost, and avoiding the temperature rise caused by providing power in an overload output manner, so as to output the electric energy required by the load for a longer time.
Drawings
Fig. 1 is a schematic diagram of a power supply apparatus according to an embodiment of the invention.
Fig. 2 is a schematic diagram of load power and charging power according to an embodiment of the invention.
Fig. 3 is a schematic diagram of sampling voltage and current output from an ac power source to a load according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a power supply apparatus according to another embodiment of the invention.
Fig. 5 is a flowchart of a power supply method of a power supply apparatus according to an embodiment of the invention.
Fig. 6 is a flowchart of a power supply method of a power supply apparatus according to another embodiment of the invention.
Fig. 7 is a flowchart of a power supply method of a power supply apparatus according to another embodiment of the invention.
Description of reference numerals:
100: a power supply device; 102: a battery module; 104: a charging circuit; 106: a control circuit; 108: an alternating current power supply; 110: a load; 402: a power conversion circuit; 404. 406: a switching circuit; PCH: a charging power; PL: a load power; PLR: presetting power; PLMAX: a load power; PD: a power difference value; PCMIN: presetting charging power; PCMAX: a maximum charging power; v (t): a voltage; i (t): current flow; t1, T2: a cycle time; v 0-vh: sampling a voltage; i 0-ih: sampling current; PAV1, PAV 2: load average power; Δ t: time of day
Detailed Description
Fig. 1 is a schematic diagram of a power supply device according to an embodiment of the invention, please refer to fig. 1. The power supply apparatus 100 may include a battery module 102, a charging circuit 104, and a control circuit 106, wherein the battery module 102 is coupled to the charging circuit 104 and the control circuit 106, the charging circuit 104 is coupled to the control circuit 106 and an ac power 108, and the ac power 108 is coupled to a load 110. The ac power source 108 may provide charging power PCH to the charging circuit 104 and load power PL to the load 110. The charging circuit 104 can charge the battery module 102. The control circuit 106 may control the charging circuit 104 to adjust the charging power PCH provided by the ac power source 108 to the charging circuit 104 according to the load power PL provided by the ac power source 108 to the load 110, for example, to maintain the total output power of the ac power source 108 below a predetermined total power. For example, as shown in fig. 2, in a situation where the total output power of the ac power source 108 is equal to the sum of the load power PL and the charging power PCH, when the load power PL is increased to be greater than the preset power PLR, the control circuit 106 may decrease the charging power PCH, for example, when the load power PL is increased to be greater than the load power PLMAX, the load power PLMAX is different from the preset power PLR by a power value PD, and the charging power PCH is correspondingly decreased by the control circuit 106 to be equal to the preset charging power PCMIN and is different from the maximum charging power PCMAX by the power value PD, that is, the decreased charging power PCH is provided as the load power PL. Thus, the sum of the load power PL and the charging power PCH can be maintained at a fixed value (e.g., a preset total power), so that the requirement of the load 110 for the load power PL can be satisfied, and the total output power of the ac power supply 108 does not exceed the preset total power, thereby achieving the purposes of saving hardware cost and improving power utilization efficiency.
In some embodiments, the predetermined charging power PCMIN may be 0, and the load power PLMAX is the maximum load power that can be provided to the load 110 without overload output after subtracting the predetermined charging power PCMIN from the total output power of the ac power supply 108, that is, when the control circuit 106 reduces the charging power PCH to be lower than the predetermined charging power PCMIN, the control circuit 106 sets the charging power PCH to the predetermined charging power PCMIN order to ensure that the charging circuit 104 can operate normally and avoid affecting the charging progress of the battery module 102.
Further, the control circuit 106 may calculate the load average power according to a plurality of sampled load real-time powers obtained by sampling the load power PL at a fixed sampling frequency within the latest half cycle time of the ac power source 108, and adjust the charging power PCH according to a comparison result between the load average power and the preset power PLR, that is, the control circuit 106 may adjust the charging power PCH only within the half cycle time at the longest, so as to efficiently stabilize the total output power of the ac power source 108. For example, fig. 3 is a schematic diagram of sampling voltage and current outputted from the ac power source to the load according to an embodiment of the invention, please refer to fig. 3. The control circuit 106 may sample the voltage v (T) and the current i (T) output from the ac power source 108 to the load at a fixed frequency (e.g., 10kHz), for example, the voltage v (T) and the current i (T) are sampled at the fixed frequency within a period time T1 to obtain a plurality of sampled voltages v 0-vh-1 and a plurality of sampled currents i 0-ih-1, and the load average power PAV1 within the period time T1 may be calculated according to the following formula (1), where the period time T1 is 1/2 of the period length of the voltage v (T) and the current i (T).
Where h is the number of samples taken within the half cycle length of the ac power supply. The control circuit 106 may adjust the charging power PCH according to a comparison result between the load average power PAV1 and the preset power PLR, for example, when the load average power PAV1 is greater than the preset power PLR, the control circuit 106 may decrease the charging power PCH so as to maintain the total output power of the ac power supply 108 below the preset total power. It should be noted that the control circuit 106 may update the load average power at the same frequency as the sampling frequency of the voltage v (t) and the current i (t), and adjust the charging power PCH according to the comparison result between the updated load average power and the preset power PLR, so as to quickly respond to the change of the load power PL and adjust the charging power PCH, thereby greatly improving the power utilization efficiency.
For example, in the embodiment of FIG. 3, the control circuit 106 samples the voltage v (T) and the current i (T) at a fixed frequency (e.g., 10kHz) within a period time T2 to obtain a plurality of sampled voltages v 1-vh and a plurality of sampled currents i 1-ih, wherein the period time T2 is shifted in time with respect to the period time T1 by a time Δ T, which may be equal to the inverse of the sampling frequency (10 kHz). Similarly, the load average power PAV2 in the period time T2 can be calculated by the following formula (2), wherein the period time T2 is also 1/2 of the period length of the voltage v (T) and the current i (T).
The control circuit 106 may adjust the charging power PCH according to the comparison result between the load average power PAV2 and the preset power PLR. Thus, the adjustment of the charging power PCH is performed at intervals of Δ t, so that it is possible to prevent the control circuit 106 from having a short time to adjust the charging power PCH due to a sudden change in the load power PL, and therefore, the high power utilization efficiency can be achieved.
Fig. 4 is a schematic diagram of a power supply apparatus according to another embodiment of the invention, please refer to fig. 4. In this embodiment, the power supply apparatus 100 may further include a power conversion circuit 402 and switch circuits 404 and 406, wherein the power conversion circuit 402 is coupled to the battery module 102, the control circuit 106 and the switch circuit 404, the switch circuit 404 is coupled to the control circuit 106 and the load 110, and the switch circuit 406 is coupled to the ac power source 108, the control circuit 106 and the load 110. The power conversion circuit 402 can convert the dc voltage provided by the battery module 102 into the ac voltage to supply power to the load 110 when the ac power 108 is abnormal, and the control circuit 106 can turn off the switch circuit 404 and the switch circuit 406 to perform the overload protection when the load power PL is greater than the preset total power. The control circuit 106 of the present embodiment may also control the charging circuit 104 to adjust the charging power PCH provided by the ac power source 108 to the charging circuit 104 according to the load power PL provided by the ac power source 108 to the load 110 as in the above embodiments.
Fig. 5 is a flowchart of a power supply method of a power supply apparatus according to an embodiment of the invention, please refer to fig. 5. In the above embodiments, the power supply method of the power supply apparatus may include the following steps. First, the load power supplied to the load by the ac power source and the charging power supplied to the charging circuit are detected (step S502). Then, the charging power provided by the ac power source to the charging circuit is adjusted according to the load power provided by the ac power source to the load, so that the total output power of the ac power source is maintained below the preset total power (step S504), wherein the total output power of the ac power source may be equal to the sum of the load power and the charging power, and the charging circuit is configured to charge the battery module. In some embodiments, the charging power is maintained above the predetermined charging power to maintain the normal operation of the charging circuit, that is, when the charging power is reduced to be less than the predetermined charging power, the charging power is still set to the predetermined charging power. In addition, in other embodiments, the power supply apparatus may further include a switch circuit in a power supply path to the load, and when the power of the load is greater than the preset total power, the switch circuit may be turned off to stop supplying power to the load, so as to perform overload protection.
Fig. 6 is a flowchart of a power supply method of a power supply apparatus according to another embodiment of the invention, please refer to fig. 6. In this embodiment, the charging power may be adjusted according to the average power of the load in the latest half cycle of the ac power source, and the power supply method of the power supply apparatus of this embodiment may include the following steps. First, the load power is sampled at a sampling frequency during the last half cycle of the ac power source to obtain a plurality of sampled load real-time powers (step S602). Next, the load average power is calculated according to the sampled load real-time powers (step S604). Then, the charging power is adjusted according to the comparison result between the load average power and the preset power (step S606). For example, when the average power of the load is greater than the preset power, the charging power may be decreased so that the total output power of the ac power supply is maintained below the preset total power. The updating frequency of the load average power can be equal to the sampling frequency, so that the charging power can be quickly adjusted in response to the change of the load power, and the power utilization efficiency is greatly improved.
Fig. 7 is a flowchart of a power supply method of a power supply apparatus according to another embodiment of the invention, please refer to fig. 7. The power supply method of the power supply apparatus of the present embodiment may include the following steps. First, it is determined whether the load power provided by the ac power source to the load is greater than a preset total power (step S702), and if the load power is greater than the preset total power, an overload protection is performed (step S704), for example, the power supply to the load may be stopped. If the load power is not greater than the predetermined total power, it is determined whether the load power provided to the load by the ac power source is greater than the predetermined power (step S706). If the load power is not greater than the predetermined power, the charging power provided by the ac power source to the charging circuit is set to the maximum charging power (step S708), so that the charging circuit can charge the battery module in the most efficient manner, wherein the maximum charging power is less than the predetermined power. If the load power is greater than the predetermined power, the charging power provided by the ac power supply to the charging circuit may be reduced (step S710), so that the ac power supply may increase the load power provided to the load and provide the electric energy required by the load without making the total output power of the ac power supply exceed the predetermined total power. Then, it is determined whether the charging power supplied from the ac power supply to the charging circuit is less than a preset charging power (step S712). And if the charging power is not less than the preset charging power, ending the flow of the power supply method. If the charging power is less than the preset charging power, the charging power is set to the preset charging power (step S714) to provide the electric energy required by the normal operation of the charging circuit.
In summary, the charging power provided by the ac power supply to the charging circuit is adjusted according to the load power provided by the ac power supply to the load, so that the total output power of the ac power supply is maintained below the preset total power, thereby satisfying the load power required by the load, improving the power utilization efficiency without increasing the hardware cost, and avoiding the temperature rise caused by providing the power in the overload output manner, so as to output the electric energy required by the load for a longer time. In some embodiments, the load average power may be calculated according to a plurality of sampled load real-time powers obtained by sampling the load power at a fixed sampling frequency during the last half cycle of the ac power source, and the charging power may be adjusted according to a comparison result between the load average power and the preset power, so as to quickly and efficiently stabilize the total output power of the ac power source.
Claims (12)
1. A power supply device, comprising:
a battery module;
the charging circuit is coupled with the battery module and an alternating current power supply, wherein the alternating current power supply provides charging power for the charging circuit and provides load power for a load, and the charging circuit charges the battery module; and
and the control circuit is coupled with the charging circuit and controls the charging circuit to adjust the charging power provided by the alternating current power supply to the charging circuit according to the load power provided by the alternating current power supply to the load, so that the total output power of the alternating current power supply is maintained below a preset total power, wherein the total output power of the alternating current power supply is equal to the sum of the load power and the charging power.
2. The power supply apparatus according to claim 1, wherein the control circuit calculates a load average power according to a plurality of sampled load real-time powers obtained by sampling the load power at a sampling frequency during a most recent half cycle of the ac power source, and adjusts the charging power according to a comparison result between the load average power and a predetermined power.
3. The power supply device according to claim 2, wherein when the average power of the load is greater than the preset power, the control circuit decreases the charging power to maintain the total output power of the ac power supply below the preset total power.
4. The power supply device according to claim 2, wherein the update frequency of the load average power is equal to the sampling frequency.
5. The power supply apparatus according to claim 1, wherein the control circuit sets the charging power to a predetermined charging power when the charging power is lower than the predetermined charging power.
6. The power supply device according to claim 1, further comprising:
the power supply conversion circuit is coupled with the battery module, and converts a direct-current voltage provided by the battery module into an alternating-current voltage to supply power to the load when the alternating-current power supply is abnormal;
the first switch circuit is coupled with the control circuit, the power conversion circuit and the load; and
and the second switch circuit is coupled with the control circuit, the alternating current power supply and the load, wherein the control circuit turns off the first switch circuit and the second switch circuit when the load power is greater than the preset total power.
7. A power supply method of a power supply device is characterized by comprising the following steps:
detecting a load power provided by an alternating current power supply to a load and a charging power provided to a charging circuit; and
and adjusting the charging power provided by the alternating current power supply to the charging circuit according to the load power provided by the alternating current power supply to the load so that the total output power of the alternating current power supply is maintained below a preset total power, and the total output power of the alternating current power supply is equal to the sum of the load power and the charging power, wherein the charging circuit is used for charging a battery module.
8. The power supply method of the power supply apparatus according to claim 7, further comprising:
sampling the load power at a sampling frequency in the latest half cycle time of the alternating current power supply to obtain a plurality of sampled load real-time powers;
calculating a load average power according to the plurality of sampling load real-time powers; and
and adjusting the charging power according to the comparison result of the load average power and a preset power.
9. The power supply method of the power supply apparatus according to claim 8, further comprising:
and when the average load power is greater than the preset power, reducing the charging power so as to maintain the total output power of the alternating current power supply below the preset total power.
10. The power supply method of claim 8, wherein the update frequency of the load average power is equal to the sampling frequency.
11. The power supply method of the power supply apparatus according to claim 7, further comprising:
and when the charging power is lower than a preset charging power, setting the charging power as the preset charging power.
12. The power supply method of claim 7, wherein the ac power source supplies power to the load via a switch circuit, the power supply method of the power supply apparatus comprising:
and when the load power is greater than the preset total power, cutting off the switch circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW109134281 | 2020-09-30 | ||
| TW109134281A TWI741819B (en) | 2020-09-30 | 2020-09-30 | Power supply device and power supply method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112271775A true CN112271775A (en) | 2021-01-26 |
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| CN202011148111.9A Pending CN112271775A (en) | 2020-09-30 | 2020-10-23 | Power supply device and power supply method thereof |
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|---|---|
| JP (1) | JP7142673B2 (en) |
| CN (1) | CN112271775A (en) |
| TW (1) | TWI741819B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI830091B (en) * | 2021-11-22 | 2024-01-21 | 威剛科技股份有限公司 | Backup power supply system and control method thereof |
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| US10641831B2 (en) * | 2017-08-25 | 2020-05-05 | Schneider Electric It Corporation | Battery current measurement |
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- 2020-09-30 TW TW109134281A patent/TWI741819B/en active
- 2020-10-23 CN CN202011148111.9A patent/CN112271775A/en active Pending
- 2020-12-18 JP JP2020209846A patent/JP7142673B2/en active Active
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| TW201407927A (en) * | 2012-08-03 | 2014-02-16 | Acer Inc | Charging method and mobile power supply divice |
| CN206060330U (en) * | 2016-05-12 | 2017-03-29 | 上海汽车集团股份有限公司 | Vehicle-mounted DC/DC transducers and vehicle-mounted low-voltage power supply system |
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| TWI830091B (en) * | 2021-11-22 | 2024-01-21 | 威剛科技股份有限公司 | Backup power supply system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202215740A (en) | 2022-04-16 |
| JP2022058076A (en) | 2022-04-11 |
| TWI741819B (en) | 2021-10-01 |
| JP7142673B2 (en) | 2022-09-27 |
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Application publication date: 20210126 |
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