CN211089207U - Parallel charging module and double-mixed type direct current screen system applying same - Google Patents
Parallel charging module and double-mixed type direct current screen system applying same Download PDFInfo
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- CN211089207U CN211089207U CN202020040553.0U CN202020040553U CN211089207U CN 211089207 U CN211089207 U CN 211089207U CN 202020040553 U CN202020040553 U CN 202020040553U CN 211089207 U CN211089207 U CN 211089207U
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Abstract
The utility model discloses a parallelly connected module of charging, including electromagnetic compatibility EMC part, 1# AC/DC alternating current-direct current converter, 2# AC/DC alternating current-direct current converter, DC/DC direct current converter and DSP control chip. The parallel charging module is provided with 2 AC/DC alternating current converters and 1 DC/DC direct current converter, can supply power to a load under the condition of alternating current input, and simultaneously charges the high-voltage battery pack and the low-voltage battery pack, and can also charge the high-voltage battery pack and supply power to the load through the DC/DC converters under the condition of no alternating current input. The utility model discloses a parallelly connected module of charging adopts full digital DSP control, realizes a plurality of converters of 1 chip simultaneous control. The parallel charging module can form a double-hybrid direct current screen system together with the existing module and the high-low voltage battery pack. The utility model discloses a two mixed type direct current screen systems have compatible high voltage battery group 6, connect low voltage battery group 8 in parallel again, have both solved the reliability problem of battery powered, have solved the systematic problem of direct current distribution link again.
Description
Technical Field
The utility model relates to a parallelly connected module of charging to a two mixed type direct current screen systems of using this parallelly connected module of charging is related to.
Background
The traditional direct current screen adopts a centralized power supply mode, a charging module (called as an existing module in the patent) can charge a group of 220V or 110V storage battery pack (called as a high-voltage battery pack in the patent), and simultaneously provides a direct current power supply for a load. As shown in fig. 1, the system has 2 existing modules 10 and 1 high-voltage battery pack 6 connected in parallel, the existing module 10 has only 1 AC/DC converter, and can charge the high-voltage battery pack 6 and supply power to the load 7 only when there is an AC input, and the existing module 10 is controlled by an analog chip and not controlled by a digital DSP chip. The system mainly has the following defects: the system is complex, large in volume and heavy; when no alternating current input exists and an open circuit fault occurs in a certain battery, the load has the problem of power supply interruption, and the reliability is low; the battery pack is formed by connecting a plurality of batteries in series, so that the validity detection of each battery is very inconvenient, and the workload of equipment maintenance is increased.
Aiming at the defects of the traditional direct current screen, the inventor conducts long-term and large-scale research, develops and designs from different angles according to actual conditions so as to meet different requirements of users, and applies for a plurality of invention patents.
For example, the inventor has developed a distributed dc power supply device, chinese invention patent No. 02112814.6, and the technology of the patent adopts distributed power supply instead of traditional centralized power supply to overcome the defects of complex system, large volume, heavy weight and low reliability of the traditional dc screen system, so that the device has small volume, no extra space occupation and high reliability, is mainly suitable for customers sensitive to the requirement of occupied space, and is suitable for small-sized switchgears.
For another example, the inventor also developed a storage battery parallel power supply method, chinese invention patent No. 200810072483.0, which is directed to the problems of power supply interruption, large maintenance workload and high user investment cost caused by that the conventional dc screen has no ac input and a certain battery has an open circuit fault, and the battery parallel connection is used to replace the conventional battery series connection, and the battery pack is not simply supplied with power in series, but is supplied with power in parallel by more than two power supply branches, and each power supply branch can be independently arranged on a plate. The power supply method is applied to the direct current screen, when the external power supply is lost, a more effective direct current power supply can be really provided, and more reliable power supply guarantee is provided for switch equipment and secondary instruments of power plants, transformer substations and the like. Meanwhile, the same power supply effect can be realized by reducing the number of storage batteries, so that the cost is greatly reduced, and the investment pressure is relieved for users.
Both the above-mentioned research and development designs are the replacement type improvement of the traditional direct current screen, but in fact, a large number of switch stations are difficult to replace and transform, and more supplementary type improvement is needed. In the centralized power supply direct current panel system, direct current feed is involved, and the requirement is to provide enough large short-circuit current, so that the direct current breaker can trip, and the matching of level difference between the second-level or more than third-level breakers is realized, thereby avoiding the situation that the direct current/direct current (DC/DC) module is simply adopted and the enough large short-circuit current cannot be provided under certain conditions so as to meet the requirements of large direct current system users. The high-voltage battery pack in the traditional direct-current screen system can provide enough short-circuit current to trip a circuit breaker on the load side, level difference coordination is realized, and the condition that other loops are power-off due to the short-circuit fault of a certain loop can be avoided. Therefore, the inventor further researches deeply, develops and designs a novel parallel charging module, and can directly add the novel module on the basis of the original traditional direct current screen system so as to make up the power supply defect and the maintenance defect of the high-voltage battery pack.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a parallel charging module, which can be applied to the combination with a conventional dc screen to compensate the defects of the conventional dc screen.
Another object of the present invention is to provide a dual hybrid dc screen system using the parallel charging module.
In order to achieve the above purpose, the solution of the present invention is:
A parallel charging module comprises an electromagnetic compatibility (EMC) part, a 1# AC/DC alternating current-direct current converter, a 2# AC/DC alternating current-direct current converter, a DC/DC direct current converter and a DSP control chip; the input end of the electromagnetic compatibility EMC part is used for being connected with an input alternating current power supply; the input end of the 1# AC/DC alternating current-direct current converter and the input end of the 2# AC/DC alternating current-direct current converter are connected to the output end of the electromagnetic compatibility EMC part in parallel; the output end of the 1# AC/DC converter outputs high voltage to supply a high-voltage battery pack and a load; the output end of the 2# AC/DC alternating current-direct current converter outputs low voltage, one branch circuit supplies the low-voltage battery pack, and the other branch circuit is connected with the input end of the DC/DC direct current converter; the output end of the DC/DC direct current converter is connected in parallel to the output end of the 1# AC/DC alternating current/direct current converter, and outputs high voltage to be supplied to the high-voltage battery pack and the load; the DSP control chip is connected to the input end of the 1# AC/DC converter for AC input sampling, the DSP control chip is connected to the output ends of the 1# AC/DC converter and the DC/DC converter for output voltage sampling and output current sampling, the DSP control chip is connected to the output end of the 2# AC/DC converter for charging current sampling and battery voltage sampling, through digital signal processing, a PWM1 signal and a PWM3 signal are output to control the 1# AC/DC converter and the DC/DC converter to charge a high-voltage battery pack, and a PWM2 signal is output to control the 2# AC/DC converter to charge a low-voltage battery pack.
The direct current screen system applying the parallel charging module is a double-mixed type direct current screen system adopting a new module and an old module and a high-low voltage battery pack, and comprises more than one existing module, more than one parallel charging module, more than one low voltage battery pack and a high voltage battery pack; all the existing modules and the parallel charging modules are connected in parallel, the input ends of the existing modules are connected with an alternating current power supply, the output ends of all the existing modules are connected to a direct current bus through a K1 switch, the output ends of all the parallel charging modules are connected to the direct current bus through a K3 switch, the output end of a 2# AC/DC alternating current/direct current converter of each parallel charging module is connected with a low-voltage battery pack, and the high-voltage battery pack is connected to the direct current bus through a K2 switch.
The low-voltage battery pack is 24V and consists of 2 sections of 12V batteries.
The high-voltage battery pack is 110V or 220V.
After the technical scheme is adopted, the utility model discloses a parallelly connected module of charging has 2 AC DC AC converter and 1 DC converter, has under the circumstances of interchange input, can be for the load power supply, charges for high-pressure battery group and low voltage battery group simultaneously, and under the circumstances of no interchange input, the low voltage battery group also can be for the high-pressure battery group charges and for the load power supply through DC converter. The utility model discloses a parallelly connected module of charging adopts full digital DSP control, realizes a plurality of converters of 1 chip simultaneous control.
The utility model discloses can directly increase new module on the basis of original traditional direct current screen system, increase n (n is greater than or equal to 1) parallelly connected module of charging and constitute, both improve the reliability of current direct current screen power supply and solve its long-term problem that exists again. When no AC input exists and the high-voltage battery pack breaks down, the low-voltage battery pack can still provide power for the load, the continuity of the power supply of the load is guaranteed, the high-voltage battery pack can be replaced on line, and the power supply defect and the maintenance defect of the high-voltage battery pack in the traditional DC screen system are overcome. The utility model discloses a parallelly connected module of charging also can independently form the direct current screen of multiple form in a flexible way. The utility model discloses also can be applied to electric automobile and charge, increase journey.
Drawings
FIG. 1 is a schematic diagram of a conventional DC screen system;
Fig. 2 is a dual hybrid dc panel system using new and old modules and high and low voltage battery packs according to the present invention;
Fig. 3 is a schematic structural diagram of the parallel charging module of the present invention.
Description of the reference symbols
An existing module 10;
Parallel charging module 20:
The electromagnetic compatibility EMC part 1, 1# AC/DC alternating current-direct current converter 2, 2# AC/DC alternating current-direct current converter 3, DC/DC direct current converter 4, DSP control chip 5, high-voltage battery pack 6, load 7 and low-voltage battery pack 8.
Detailed Description
Referring to fig. 3, the present invention discloses a parallel charging module 20, which includes an EMC part 1, a 1# AC/DC converter 2, a 2# AC/DC converter 3, a DC/DC converter 4 and a DSP control chip 5. An input terminal of the electromagnetic compatibility EMC portion 1 is connected to an inputted ac power supply. An input terminal of the 1# AC/DC converter 2 is connected in parallel with an input terminal of the 2# AC/DC converter 3, and is connected to an output terminal of the electromagnetic compatibility EMC section 1. The output end of the 1# AC/DC converter 2 outputs high voltage to be supplied to a high-voltage battery pack 6 (which can be an 18-section 12V battery pack or a 108-section 2V battery pack) and a load 7. The output end of the 2# AC/DC converter 3 outputs low voltage, one branch is supplied to a low-voltage battery pack 8 (24V can be formed by 2 batteries with 12V), and the other branch is connected with the input end of the DC/DC converter 4. The output end of the DC/DC direct current converter 3 is connected in parallel to the output end of the 1# AC/DC alternating current-direct current converter 2, and outputs high voltage to be supplied to the high-voltage battery pack 6 and the load 7. The DSP control chip 5 is connected with the input end of the 1# AC/DC converter 2 for AC input sampling, the DSP control chip 5 is connected with the output ends of the 1# AC/DC converter 2 and the DC/DC converter 4 for output voltage sampling and output current sampling, the DSP control chip 5 is connected with the output end of the 2# AC/DC converter 3 for charging current sampling and battery voltage sampling, through digital signal processing (such as PID algorithm), a PWM1 signal (pulse width modulation signal) is output to control the 1# AC/DC converter 2 to charge the high-voltage battery pack 6, a PWM3 signal (pulse width modulation signal) is output to control the DC/DC converter 4 to charge the high-voltage battery pack 6, and a PWM2 signal (pulse width modulation signal) is output to control the 2# AC/DC converter 3 to charge the low-voltage battery pack 8.
The utility model discloses parallelly connected module 20's that charges theory of operation:
(1) When alternating current is input, the 1# AC/DC alternating current-direct current converter 2 charges the high-voltage battery pack 6 and simultaneously supplies power to the load 7; the 2# AC/DC converter 3 charges the low-voltage battery pack 8; the DC/DC converter 4 is in a standby working state and does not provide power for the load 7 and the high-voltage battery pack 6.
(2) When there is no AC input, the 1# AC/DC converter 2 and the 2# AC/DC converter 3 stop operating, and the low-voltage battery pack 8 charges the high-voltage battery pack 6 through the DC/DC converter 4 and supplies power to the load 7.
(3) Under the condition of alternating current input, the DPS control chip 5 can also control the 1# AC/DC alternating current-direct current converter 2 and the 2# AC/DC alternating current-direct current converter 3 to stop working, so that the low-voltage battery pack 8 charges the high-voltage battery pack 6 through the DC/DC direct current converter 4 and supplies power to the load 7, and the functions of discharging maintenance and online capacity checking of the low-voltage battery pack 8 are realized.
(4) The DSP control chip 5 samples the direct current output voltage Vo and the output current Io and adjusts the duty ratio of PWM1 through a PID algorithm to realize the function of charging the high-voltage battery pack 6 by the 1# AC/DC converter 2.
(5) The DSP control chip 5 realizes the function of charging the low-voltage battery pack 8 by the 2# AC/DC converter 3 through sampling the voltage Vb and the charging current Ib of the low-voltage battery pack and adjusting the duty ratio of the PWM2 through a PID algorithm.
(6) The DSP control chip 5 samples the direct current output voltage Vo and the output current Io and adjusts the duty ratio of the PWM3 through a PID algorithm to realize the function that the DC/DC direct current converter 4 charges the high-voltage battery pack 6.
The utility model discloses a parallelly connected module 20 that charges (the novel module is called in this patent) adopts digital power scheme, increases the function that charges for a set of 24V low voltage battery group to can be 220V or 110V output with this low voltage battery group 24V voltage conversion, charge and supply power for load 7 for 220V or 110V high voltage battery group 6 simultaneously. Has the following advantages:
Referring to fig. 2, it is the utility model discloses the application of parallelly connected module 20 that charges, for the two mixed type direct current screen systems that adopt new and old module and high-low voltage battery group, including 2 current modules 10, 2 parallelly connected module 20, 2 low voltage battery groups 8 and 1 high voltage battery group 6 that charge that. All the existing modules 10 and the parallel charging modules 20 are connected in parallel, the input ends of the existing modules are connected with an alternating current power supply, the output ends of all the existing modules 10 are connected to a direct current bus through a K1 switch, the output ends of all the parallel charging modules 20 are connected to the direct current bus through a K3 switch, the output end of the 2# AC/DC alternating current/direct current converter 3 of each parallel charging module 20 is connected with a low-voltage battery pack 8, and the high-voltage battery pack 6 is connected to the direct current bus through a K2 switch. The utility model discloses increase n (n is greater than or equal to 1) in traditional direct current screen system the utility model discloses a parallelly connected module 20 that charges, it is parallelly connected with its direct current output and traditional direct current screen module output that charges, can constitute the two mixed type direct current screens that different group battery and different modules of charging used thoughtlessly, increase the battery capacity of traditional direct current screen system, improve the reliability of traditional direct current screen power supply, solve the long-term problem that exists of traditional direct current screen system. When alternating current is input, the alternating current outputs direct current through the existing module 10 and the parallel charging module 20 to charge the high-voltage battery pack 6 and supply power to the load 7; and simultaneously, alternating current charges the low-voltage battery pack 8 through the parallel charging module 20. When no AC input exists, the existing module 10 stops working, and the 24V low-voltage battery pack 8 outputs DC power to charge the high-voltage battery pack 6 and supply power to the load 7 after being boosted by the parallel charging module 20. Under the condition of alternating current input, when discharging maintenance or online capacity check needs to be carried out on the low-voltage battery pack 6, the existing module 10 can stop working, and the 24V low-voltage battery pack 8 is boosted by the parallel charging module 20 and then outputs direct current to charge the high-voltage battery pack 6 and supply power to the load 7. When no AC input exists and the high-voltage battery pack 6 has a fault, the low-voltage battery pack 8 can still provide power for the load 7, the power supply continuity of the load 7 is ensured, and the high-voltage battery pack 6 can be replaced on line.
The utility model discloses a two mixed type direct current cabinet systems compare with the direct current cabinet system that does not have high voltage battery group 6, if do not have high voltage battery group 6, when the load of a certain return circuit is witnessed short-circuit fault, the power electronics transform output that simply leans on current module 10 and parallelly connected module 20 that charges is not enough to provide enough big short-circuit current and makes the circuit breaker tripping operation of load side, can lead to current module 10 and parallelly connected module 20 that charges like this to carry out overcurrent protection, lead to all load return circuits all to lose electricity. The utility model discloses a two mixed type direct current screen systems have compatible high voltage battery group 6, connect low voltage battery group 8 in parallel again, have both solved the reliability problem of battery powered, have solved the systematic problem of direct current distribution link again.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. A parallel charging module, characterized in that: the electromagnetic compatibility EMC part comprises an electromagnetic compatibility EMC part, a 1# AC/DC alternating current-direct current converter, a 2# AC/DC alternating current-direct current converter, a DC/DC direct current converter and a DSP control chip; the input end of the electromagnetic compatibility EMC part is used for being connected with an input alternating current power supply; the input end of the 1# AC/DC alternating current-direct current converter and the input end of the 2# AC/DC alternating current-direct current converter are connected to the output end of the electromagnetic compatibility EMC part in parallel; the output end of the 1# AC/DC converter outputs high voltage to supply a high-voltage battery pack and a load; the output end of the 2# AC/DC alternating current-direct current converter outputs low voltage, one branch circuit supplies the low-voltage battery pack, and the other branch circuit is connected with the input end of the DC/DC direct current converter; the output end of the DC/DC direct current converter is connected in parallel to the output end of the 1# AC/DC alternating current/direct current converter, and outputs high voltage to be supplied to the high-voltage battery pack and the load; the DSP control chip is connected to the input end of the 1# AC/DC converter for AC input sampling, the DSP control chip is connected to the output ends of the 1# AC/DC converter and the DC/DC converter for output voltage sampling and output current sampling, the DSP control chip is connected to the output end of the 2# AC/DC converter for charging current sampling and battery voltage sampling, through digital signal processing, a PWM1 signal and a PWM3 signal are output to control the 1# AC/DC converter and the DC/DC converter to charge a high-voltage battery pack, and a PWM2 signal is output to control the 2# AC/DC converter to charge a low-voltage battery pack.
2. A parallel charging module according to claim 1, wherein: the low-voltage battery pack is 24V and consists of 2 sections of 12V batteries.
3. A parallel charging module according to claim 1, wherein: the high-voltage battery pack is 110V or 220V.
4. Use two mixed type direct current screen systems of parallelly connected module of charging, its characterized in that: the system comprises more than one existing module, more than one parallel charging module, more than one low-voltage battery pack and one high-voltage battery pack; parallel charging module as claimed in claim 1, all existing modules and parallel charging modules are connected in parallel, the input terminal is connected to the AC power source, the output terminal of all existing modules is connected to the DC bus through the K1 switch, the output terminal of all parallel charging modules is connected to the DC bus through the K3 switch, the output terminal of the # 2 AC/DC converter of each parallel charging module is connected to a low voltage battery pack, and the high voltage battery pack is connected to the DC bus through the K2 switch.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922476A (en) * | 2021-09-30 | 2022-01-11 | 石家庄通合电子科技股份有限公司 | High-safety module group direct-current power supply |
| CN115313597A (en) * | 2022-08-26 | 2022-11-08 | 歌尔科技有限公司 | Double-battery power supply system and electronic equipment |
| WO2023050960A1 (en) * | 2021-09-30 | 2023-04-06 | 比亚迪股份有限公司 | Battery swap control method and system for vehicle, and vehicle |
| CN116488322A (en) * | 2023-06-25 | 2023-07-25 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output DC power supply device and control method |
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2020
- 2020-01-08 CN CN202020040553.0U patent/CN211089207U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922476A (en) * | 2021-09-30 | 2022-01-11 | 石家庄通合电子科技股份有限公司 | High-safety module group direct-current power supply |
| WO2023050960A1 (en) * | 2021-09-30 | 2023-04-06 | 比亚迪股份有限公司 | Battery swap control method and system for vehicle, and vehicle |
| CN113922476B (en) * | 2021-09-30 | 2024-03-26 | 石家庄通合电子科技股份有限公司 | High-safety module group direct-current power supply |
| CN115313597A (en) * | 2022-08-26 | 2022-11-08 | 歌尔科技有限公司 | Double-battery power supply system and electronic equipment |
| CN115313597B (en) * | 2022-08-26 | 2025-12-05 | 歌尔科技有限公司 | A dual-battery power supply system and electronic device |
| CN116488322A (en) * | 2023-06-25 | 2023-07-25 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output DC power supply device and control method |
| CN116488322B (en) * | 2023-06-25 | 2023-09-12 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output direct-current power supply device and control method |
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