Multistage series-parallel connection switching circuit based on charging module

Abstract

The utility model discloses a multi-stage series-parallel connection switching circuit based on a charging module, and the circuit comprises a plurality of series-parallel connection groups, and each series-parallel connection group comprises at least two charging unit groups. The first-stage series-parallel connection switching circuit is used for switching the series connection or the parallel connection of each charging unit group in the series-parallel connection group; and the secondary series-parallel switching circuit is used for switching the series connection or the parallel connection of each series-parallel group. According to the scheme, a multi-stage series-parallel connection switching circuit is provided for the charging circuit, charging requirements of different voltages can be met through different series-parallel connection modes and voltage and current setting of different charging modules, and the charging module has more advantages in noise, heat dissipation and size compared with a traditional charging module.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage charging circuit structures, and in particular relates to a multi-stage series-parallel switching circuit based on a charging module. Background Art

[0002] The development of series-parallel switching circuit technology for charging modules stems primarily from the rapid development of electric vehicle technology and the increasing demand for higher output power and voltage range for charging modules. With the continuous advancement and widespread adoption of electric vehicle technology, the requirements for charging infrastructure are also becoming increasingly stringent. To meet the needs of electric vehicles with different models, battery capacities, and charging requirements, charging modules must have a wider output voltage range and higher output power. Therefore, series-parallel switching technology for charging modules has emerged. By flexibly adjusting the series and parallel connection of charging modules, efficient and stable charging can be achieved to meet different charging requirements.

[0003] The existing working DC power supplies generally have the disadvantages of large size and high noise. In addition, traditional high-voltage and high-power power supplies are expensive, generally costing 1 yuan / W, while the charging module can be as low as 0.1 yuan / W. In this regard, this solution proposes a multi-stage series-parallel switching circuit based on the charging module. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a multi-stage series-parallel switching circuit based on a charging module.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multi-stage series-parallel switching circuit based on a charging module, comprising:

[0007] A plurality of series-parallel groups, each series-parallel group including at least two charging unit groups;

[0008] The first-level series-parallel switching circuit is used to switch the charging units in the series-parallel group into series or parallel;

[0009] The secondary series-parallel switching circuit is used to switch the series-parallel groups into series or parallel.

[0010] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, the input side of each charging unit group is used to obtain electrical energy from the incoming power supply through a main circuit breaker. The main circuit breaker can be integrated in this circuit or can be a main circuit breaker outside this circuit.

[0011] The output side of each charging unit group is used to connect to the charging output port to output the charging power required by the user.

[0012] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, each charging unit group includes at least one charging unit, and when each charging unit group includes at least two charging units, the charging units in each charging unit group are connected in parallel with each other;

[0013] Each charging unit includes a charging module, a branch circuit breaker and an anti-backflow component;

[0014] The branch circuit breaker is connected between the input side of the corresponding charging module and the main circuit breaker, and the branch circuit breaker is used to independently control the power on and off of the corresponding charging module.

[0015] The anti-backflow element is connected between the corresponding charging module and the charging output port;

[0016] In the aforementioned multi-stage series-parallel switching circuit based on the charging module, the first-stage series-parallel switching circuit includes a first switch and a second switch. The charging unit groups within the series-parallel group are connected in series via the first switch and in parallel via the second switch. When the first switch is on and the second switch is off, the corresponding charging unit groups within the series-parallel group are connected in series. When the first switch is off and the second switch is on, the corresponding charging unit groups within the series-parallel group are connected in parallel. The first switch can be a single switch device or multiple switch devices. Similarly, the second switch can be a single switch device or multiple switch devices, and the specific design is based on needs.

[0017] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, the series are connected in series through the third switching switch and in parallel through the fourth switching switch. When the third switching switch is connected and the fourth switching switch is turned off, the series-parallel groups are connected in series. When the third switching switch is turned off and the fourth switching switch is connected, the series-parallel groups are connected in parallel.

[0018] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, the anti-backflow element is a diode, the anode of the diode is connected to the positive electrode of the output side of the corresponding charging module, and the cathode is connected to the corresponding switching switch;

[0019] Each series-parallel group comprises the first switch and the second switch, the first switch in each series-parallel group comprises at least one switching device, and the at least two charging unit groups in the series-parallel group are sequentially connected in series via the switching device of the first switch;

[0020] The second switch in each series-parallel group includes at least two switching devices, and the at least two charging unit groups in the series-parallel group are connected in parallel with each other through the at least two switching devices of the second switch;

[0021] The third switch includes at least one switching device, and the series-parallel groups are connected in series in sequence through the switching device of the third switch;

[0022] The fourth switch includes at least two switching devices, and each series group is connected in parallel with each other through the at least two switching devices of the fourth switch.

[0023] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, the circuit includes two series-parallel groups, and the third switching switch includes a switching device KM9, the two ends of which are respectively connected to the output side negative electrode of one series-parallel group and the output side positive electrode of the other series group, so that the positive and negative electrodes of the two series-parallel groups are connected in series when closed;

[0024] The fourth switching switch includes two switching devices KM10 and KM11, wherein the two ends of one switching device KM11 are respectively connected between the positive poles of the output sides of the two series-parallel groups, and the two ends of the other switching device KM10 are respectively connected between the negative poles of the output sides of the two series-parallel groups.

[0025] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, each series-parallel group includes two charging unit groups;

[0026] The first switch of each series-parallel group includes a switch device KM3 or KM6, the two ends of which are respectively connected to the negative output electrode of one charging unit group and the positive output electrode of the other charging unit group, so as to connect the positive and negative electrodes of the two charging unit groups in series when closed;

[0027] The second switching switch of each series-parallel group includes switching devices KM4, KM5 or KM7, KM8, wherein the two ends of one switching device KM4 or KM7 are respectively connected between the positive poles of the output sides of the two charging unit groups, and the two ends of the other switching device KM5 or KM8 are respectively connected between the negative poles of the output sides of the two charging unit groups.

[0028] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, a fuse and a current sampling unit are provided between this circuit and the charging output port;

[0029] There is a voltage sampling unit between the positive and negative electrodes on the output side of this circuit;

[0030] There is an isolation switch between the positive and negative poles on the output side of the circuit and the charging output port respectively.

[0031] In the above-mentioned multi-stage series-parallel switching circuit based on the charging module, the isolating switch, current sampling unit, voltage sampling unit, main circuit breaker, branch circuit breaker, switch, and charging module are all connected to the control module.

[0032] Compared with the existing technology, the advantages of the present invention are: the multi-stage series-parallel switching circuit based on the charging module provided by the circuit of this scheme uses the practical charging module as the main component, which has obvious cost advantages compared with traditional high-power power supplies. Moreover, this scheme realizes the high-power DC power supply that can be achieved by traditional high-power power supplies through a multi-stage series-parallel structure. It can meet the charging requirements of different voltages through different series-parallel methods and the voltage and current settings of each charging module. It has more advantages than traditional charging modules in terms of noise, heat dissipation and volume, and can be widely used in occasions requiring a wide range of output voltage and current regulation, such as electric vehicle charging stations, industrial DC power supplies, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an example of a circuit structure of a multi-stage series-parallel switching circuit based on a charging module in the present utility model;

[0034] Figure 2 is used Figure 1 Schematic diagram of 8-way parallel output of the circuit structure example;

[0035] Figure 3 is used Figure 1 Circuit structure example of 2 series and 4 parallel output;

[0036] Figure 4 is used Figure 1 Circuit structure example of 4 series and 2 parallel output.

[0037] In the figure: series-parallel group 1; charging unit group 2. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] This embodiment takes an example in which a circuit has two series-parallel groups 1, each series-parallel group 1 has two charging unit groups 2, and each charging unit group 2 has two charging units. At the same time, a diode D is used as the anti-backflow element, a DC contactor switch is used as the switching device, and an output contactor switch is used as the isolating switch to illustrate the circuit structure provided by this solution.

[0040] like Figure 1 As shown, this circuit mainly includes several circuit breakers QF, several charging modules U, several diodes D, several DC contactors KM, fuses F, current sampling units B1, and voltage sampling units B2. Circuit breakers QF, DC contactors KM, fuses F, current sampling units B1, and voltage sampling units B2 are connected to the control module.

[0041] Circuit breaker QF1 is electrically operated and can be opened and closed by the control module to power on and off the subsequent circuits. QF2 through QF9 are small circuit breakers that distribute power to a single charging module, providing protection and facilitating maintenance. They can also be opened and closed by the control module to power on and off the single charging module. The principle of opening and closing the circuit breaker by the control module is consistent with existing technology and will not be elaborated here. Charging module U can be considered as multiple independent power supply units, and diodes prevent backflow of current, protecting the circuit from reverse current.

[0042] DC contactors KM1 and KM2 are output contactors. They close before output and disconnect during shutdown, isolating the device from the high-voltage side and providing protection. KM3-KM11 are used for series-parallel switching between charging modules. Fuse F provides overload and short-circuit protection. Current sampling unit B1 collects output current in real time and feeds it back to the control module. Voltage sampling unit B2 collects output voltage in real time and feeds it back to the control module. Current and voltage sampling data are output to the control module, allowing it to perform circuit monitoring for abnormal conditions such as overcurrent, overvoltage, overtemperature, input anomalies, voltage imbalance, and current imbalance. In such cases, the control module can shut down the circuit or take other protective measures to prevent circuit or equipment damage.

[0043] In this embodiment, the specific connection method of the series-parallel switching circuit is as follows: the three-phase incoming power supply is divided into 8 groups through the circuit breaker QF1, and is respectively connected to the input ends of the circuit breakers QF2~QF9, the output ends of the circuit breakers QF2~QF9 are respectively connected to the input sides of the charging modules U1~U8, and the positive poles of the output sides of the charging modules U1~U8 are respectively connected to the anodes of the diodes D1~D8.

[0044] The cathode of diode D1 is connected in parallel with the cathode of diode D2 and then connected to one end of DC contactor KM5 and fuse FU1. The negative electrode of the output side of charging module U1 is connected in parallel with the negative electrode of the output side of charging module U2 and then connected to one end of DC contactors KM3 and KM4.

[0045] The cathode of diode D3 is connected in parallel with the cathode of diode D4 and then connected to the other end of DC contactors KM3 and KM5. The negative electrode of the output side of charging module U3 is connected in parallel with the negative electrode of the output side of charging module U4 and then connected to the other end of DC contactor KM4.

[0046] The cathode of diode D5 is connected in parallel with the cathode of diode D6 and then connected to one end of DC contactor KM8. The negative electrode of the output side of charging module U5 is connected in parallel with the negative electrode of the output side of charging module U6 and then connected to one end of DC contactors KM6 and KM7.

[0047] The cathode of diode D7 is connected in parallel with the cathode of diode D8 and then connected to the other end of DC contactors KM6 and KM8. The negative pole on the output side of charging module U7 is connected in parallel with the negative pole on the output side of charging module U8 and then connected to the other end of DC contactor KM7 and one end of KM2.

[0048] The other end of DC contactor KM4 is connected to one end of DC contactors KM9 and KM10. One end of DC contactor KM8 is connected to the other ends of DC contactors KM9 and KM11. One end of KM11 is connected to fuse F. The other end of DC contactor KM10 is connected to DC contactor KM2.

[0049] The other end of fuse F is connected to one end of DC contactor KM1. The positive output terminal passes through current sampling unit B1, and voltage sampling unit B2 is connected to the output terminal of the charging module, respectively, for real-time monitoring of current and voltage to ensure stable circuit operation. The positive terminal of voltage sampling unit B2 is connected to the other end of KM1, and the negative terminal of voltage sampling unit B2 is connected to the other end of KM2. Current sampling unit B1 and voltage sampling unit B2 can use current sensors, voltage sensors, or shunts, respectively.

[0050] According to the circuit, in the above figure, charging modules U1 and U2 are directly connected in parallel, U3 and U4 are directly connected in parallel, U5 and U6 are directly connected in parallel, and U7 and U8 are directly connected in parallel.

[0051] Based on the series-parallel switching circuit connected above, the requirements of different output voltage ranges can be met by switching between series and parallel modes. The switching between series and parallel modes can be automatically switched by the control module according to the user's charging voltage requirements, or the user can manually set the switching through the control module according to their own charging voltage requirements. In general, the series-parallel switching is performed in two levels, for example:

[0052] The output voltage is in the range of 0~1000V, the first level is connected in parallel, the second level is connected in parallel, and the charging module has 8 parallel outputs, such as Figure 2 As shown:

[0053] First-level series-parallel connection: KM3 is disconnected, KM4 and KM5 are closed, U1~U4 are connected in parallel; KM6 is disconnected, KM7 and KM8 are closed, U5~U8 are connected in parallel;

[0054] Secondary series-parallel connection: KM9 is disconnected, KM10 and KM11 are closed, and the final series-parallel connection relationship is U1~U4 in parallel with U5~U8.

[0055] The output voltage is in the range of 1000~2000V, the first level is connected in series and the second level is connected in parallel, and the charging module has 2 series and 4 parallel outputs. Figure 3 As shown:

[0056] First-level series-parallel connection: KM3 is closed, KM4 and KM5 are disconnected, U1, U2 are connected in series with U3, U4; KM6 is closed, KM7 and KM8 are disconnected, U5, U6 are connected in series with U7, U8;

[0057] Secondary series-parallel connection: KM9 is disconnected, KM10 and KM11 are closed, and the final series-parallel connection relationship is U1, U2, U5, U6 connected in series with U3, U4, U7, U8.

[0058] The output voltage is in the range of 2000~4000V, the first level is connected in series and the second level is connected in series, the charging module has 4 series and 2 parallel outputs, such as Figure 4 As shown:

[0059] First-level series-parallel connection: KM3 is closed, KM4 and KM5 are disconnected, U1, U2 are connected in series with U3, U4; KM6 is closed, KM7 and KM8 are disconnected, U5, U6 are connected in series with U7, U8; Second-level series-parallel connection: KM9 is closed, KM10 and KM11 are disconnected, and the final series-parallel relationship is U1, U2 are connected in series with U3, U4 are connected in series with U5, U6 are connected in series with U7, U8.

[0060] Since different voltage levels correspond to different series and parallel methods, when the set voltage U is less than 1000V, the voltage of each charging module is set to U, and the current is set to I / n, where n is the number of modules. When the set voltage U is greater than 1000V, the voltage of each charging module is set to U / 2, and the current is set to 2I / n, where n is the number of modules. When the set voltage U is greater than 2000V, the voltage of each charging module is set to U / 4, and the current is set to 4I / n, where n is the number of modules. In short, the main implementation principle is that in series mode, the output voltages of the charging modules are superimposed to provide a higher output voltage; in parallel mode, the output currents of the charging modules are superimposed to provide a larger output current. Similarly, the voltage and current settings of the charging module can be set by the user according to needs or by the control module according to charging needs. The focus of this solution is Figure 1 The circuit structure shown enables the power supply circuit provided by this solution to achieve a wider output range at a lower cost and be applicable to a variety of different charging voltage requirements, regardless of the control method of the circuit structure. For example, switching can be completed manually by the user or automatically by the control module according to the charging requirements. The voltage and current of the charging module can be adjusted manually by the user or automatically by the control module according to the charging requirements. Of course, the correspondence between the switching switch combination mode and the voltage and current of the control module can also be pre-stored in the memory. When the user manually or the control module automatically switches to a mode, the voltage and current adjustment of the control module is also completed.

[0061] It should be noted that the above switching switches can also be replaced by power electronic devices such as IGBT, MOSFET, etc., as long as the series-parallel switching requirements are met.

[0062] The above configuration uses 8 charging modules. When put into use, the number may be other values, such as 4, that is, each charging unit group 2 has only one charging unit. The number may also be 12, such as each charging unit group 2 has three charging units, such as each series-parallel group 1 has three charging unit groups 2, each charging unit group 2 has two charging units, and so on. Preferably, the number of charging modules is an integer multiple of 4.

[0063] The above charging modules can use models such as the R75020G4 and R95021G1, but are not limited here. Charging modules generally feature high power density and high efficiency. Circuits based on these modules can achieve high power output in a very small size, offering advantages over traditional high-power power supplies in terms of noise, heat dissipation, and size.

[0064] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0065] Although this document frequently uses terms such as series-parallel group 11, charging unit group 2, series-parallel switching circuit, secondary series-parallel switching circuit, main circuit breaker, charging unit, branch circuit breaker, backflow prevention element, disconnector, current sampling unit, transfer switch, and charging module, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A multi-stage series-parallel switching circuit based on a charging module, characterized in that: include, A plurality of series-parallel groups, each series-parallel group including at least two charging unit groups; The first-level series-parallel switching circuit is used to switch the charging units in the series-parallel group into series or parallel; The secondary series-parallel switching circuit is used to switch the series-parallel groups into series or parallel.

2. The multi-stage series-parallel switching circuit based on the charging module according to claim 1, characterized in that: The input side of each charging unit group is used to obtain electrical energy from the incoming power supply via the main circuit breaker; The output side of each charging unit group is used to connect to the charging output port.

3. The multi-stage series-parallel switching circuit based on the charging module according to claim 2, characterized in that: Each charging unit group includes at least one charging unit, and when each charging unit group includes at least two charging units, the charging units in each charging unit group are connected in parallel; Each charging unit includes a charging module, a branch circuit breaker and an anti-backflow component; The branch circuit breaker is connected between the input side of the corresponding charging module and the main circuit breaker; The backflow prevention element is connected between the corresponding charging module and the charging output port.

4. The multi-stage series-parallel switching circuit based on the charging module according to claim 3, characterized in that: The first-level series-parallel switching circuit includes a first switching switch and a second switching switch. The charging unit groups in the series-parallel group are connected in series through the first switching switch and in parallel through the second switching switch. When the first switching switch is connected and the second switching switch is turned off, the corresponding charging unit groups in the series-parallel group are connected in series. When the first switching switch is turned off and the second switching switch is connected, the corresponding charging unit groups in the series-parallel group are connected in parallel.

5. The multi-stage series-parallel switching circuit based on the charging module according to claim 4 is characterized in that: The secondary series-parallel switching circuit includes a third switching switch and a fourth switching switch. The series-parallel groups are connected in series through the third switching switch and in parallel through the fourth switching switch. When the third switching switch is connected and the fourth switching switch is turned off, the series-parallel groups are connected in series. When the third switching switch is turned off and the fourth switching switch is connected, the series-parallel groups are connected in parallel.

6. The multi-stage series-parallel switching circuit based on the charging module according to claim 5, characterized in that: The anti-backflow element is a diode, the anode of the diode is connected to the positive electrode of the output side of the corresponding charging module, and the cathode is connected to the corresponding switch; Each series-parallel group comprises the first switch and the second switch, the first switch in each series-parallel group comprises at least one switching device, and the at least two charging unit groups in the series-parallel group are sequentially connected in series via the switching device of the first switch; The second switch in each series-parallel group includes at least two switching devices, and the at least two charging unit groups in the series-parallel group are connected in parallel with each other through the at least two switching devices of the second switch; The third switch includes at least one switching device, and the series-parallel groups are connected in series in sequence through the switching device of the third switch; The fourth switch includes at least two switching devices, and each series group is connected in parallel with each other through the at least two switching devices of the fourth switch.

7. The multi-stage series-parallel switching circuit based on the charging module according to claim 6, characterized in that: The circuit includes two series-parallel groups, and the third switch includes a switch device KM9, the two ends of which are respectively connected to the output side negative electrode of one series-parallel group and the output side positive electrode of the other series group, so that the positive and negative electrodes of the two series-parallel groups are connected in series when closed; The fourth switching switch includes two switching devices KM10 and KM11, wherein the two ends of one switching device KM11 are respectively connected between the positive poles of the output sides of the two series-parallel groups, and the two ends of the other switching device KM10 are respectively connected between the negative poles of the output sides of the two series-parallel groups.

8. The multi-stage series-parallel switching circuit based on the charging module according to claim 7, characterized in that: Each series-parallel group includes two charging unit groups; The first switch of each series-parallel group includes a switch device KM3 or KM6, the two ends of which are respectively connected to the negative output electrode of one charging unit group and the positive output electrode of the other charging unit group, so as to connect the positive and negative electrodes of the two charging unit groups in series when closed; The second switching switch of each series-parallel group includes switching devices KM4, KM5 or KM7, KM8, wherein the two ends of one switching device KM4 or KM7 are respectively connected between the positive poles of the output sides of the two charging unit groups, and the two ends of the other switching device KM5 or KM8 are respectively connected between the negative poles of the output sides of the two charging unit groups.

9. The multi-stage series-parallel switching circuit based on the charging module according to claim 5, characterized in that: There is a fuse and a current sampling unit between this circuit and the charging output port; There is a voltage sampling unit between the positive and negative electrodes on the output side of this circuit; There is an isolation switch between the positive and negative poles on the output side of the circuit and the charging output port respectively.

10. The multi-stage series-parallel switching circuit based on the charging module according to claim 9, characterized in that: The isolating switch, current sampling unit, voltage sampling unit, main circuit breaker, branch circuit breaker, switch and charging module are all connected to the control module.

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