TWI685170B - Intelligent current control device - Google Patents

Abstract

An intelligent current control device performs current control on a power supply branch and a load, and includes at least one power conversion unit and a control unit. The control unit controls a combined current of each single-phase current of an independent phase and a household phase current of the same phase in the power supply branch to be less than or equal to a rated phase current of the power supply branch.

Description

Intelligent current control device

The invention relates to an intelligent current control device, in particular to an intelligent current control device which dynamically adjusts the charging and discharging current of an electric vehicle in two directions.

In the application of electric vehicle charging and discharging, because the electric vehicle requires a large amount of power, the current practice is to provide an independent charging branch to meet the rated power required by the electric vehicle charger. Therefore, an additional application is usually required The new power capacity is used by electric vehicle chargers. However, in some applications (such as personal residences), if you want to install a load with a large power demand such as an electric vehicle charger under the existing power supply branch and the assigned rated power, in order to avoid the total power usage exceeding the rated power Even further cause the front-end circuit breaker to trip, and the power supply will be limited by the branch with the smallest remaining power after the rated power of each power supply branch is deducted from the power used by the existing load. Therefore, it is difficult to make the most effective use of power in a limited power supply, to further reduce the charging time of electric vehicles and improve user convenience. In addition, when the electric vehicle is connected to the charger, the battery mounted on the electric vehicle can be a source of power, which can provide the entire power system for power dispatching.

Therefore, how to design an intelligent current control device, using the intelligent current control device to independently limit and adjust the size of each phase of single-phase current, to maximize the use of the original set rated power, is the creator of this case to overcome And to solve a major problem.

In order to solve the above problems, the present invention provides an intelligent current control device to overcome the problems of the conventional technology. Therefore, the intelligent current control device of the present invention performs current control on the power supply branch and the load. The intelligent current control device includes: at least one power conversion unit, which transmits a plurality of single-phase currents in independent phases by the power supply branch, and The phase current transmits the total charge and discharge power to charge or discharge the load. And a control unit, coupled to at least one power conversion unit. Wherein, the control unit controls the total phase current of each single-phase current of the independent phase and the household phase current of the same phase in the power supply branch to be less than or equal to the rated phase current of the power supply branch.

In order to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. I believe the purpose, features and characteristics of the present invention can be obtained in depth and For specific understanding, the accompanying drawings are provided for reference and explanation only, and are not intended to limit the present invention.

100‧‧‧Power supply system

10‧‧‧Power supply branch

12‧‧‧Breaking unit

14-1, 14-2, 14-3 ‧‧‧ household load

20, 20’, 20”‧‧‧‧ Intelligent current control device

22-1, 22-2, 22-3‧‧‧ first current detection unit

24, 24’, 24-1~24-n‧‧‧‧Power conversion unit

242-1, 242-2, 242-3‧‧‧Converter

244‧‧‧Controller

246-1, 246-2, 246-3 ‧‧‧ second current detection unit

248‧‧‧Sub-controller

26‧‧‧Power detection unit

28‧‧‧Control unit

200‧‧‧car load

Ira1, Ira2, Ira3 ‧‧‧ Rated phase current

Ia1, Ia2, Ia3 ‧‧‧ total phase current

Ih1, Ih2, Ih3 ‧‧‧ household phase current

It1, It2, It3‧‧‧single-phase current

Ict‧‧‧Total charge and discharge current

Ic1~Icn‧‧‧Charge and discharge current

Ics1, Ics2, Ics3 ‧‧‧ Single-phase charge and discharge current

Vac1, Vac2, Vac3‧‧‧single-phase voltage

Vat‧‧‧Total charging voltage

Si1, Si2, Si3 ‧‧‧ household current signal

Sr1, Sr2, Sr3 ‧‧‧ Rated current signal

Sb1, Sb2, Sb3 ‧‧‧ residual current signal

Sd‧‧‧ handshake signal

Sa1, Sa2, Sa3‧‧‧ Current control signal

St1, St2, St3‧‧‧single-phase current signal

Sc1~Scn‧‧‧Current command

1 is a schematic circuit block diagram of the intelligent current control device of the present invention; FIG. 2A is a schematic circuit block diagram of the first embodiment of the intelligent current control device of the present invention; FIG. 2B is a circuit block diagram of the second embodiment of the intelligent current control device of the present invention 3A is a circuit block diagram of the first embodiment of the power conversion unit of the present invention; FIG. 3B is a circuit block diagram of the second embodiment of the power conversion unit of the present invention; 4 is a schematic circuit block diagram of a third embodiment of the intelligent current control device of the present invention; FIG. 5A is a schematic diagram of the charging control waveform of the intelligent current control device of the present invention; and FIG. 5B is a schematic diagram of the discharge control waveform of the intelligent current control device of the present invention.

In order to facilitate the description of the device features of the present invention, the technical contents and detailed descriptions of the present invention are described and illustrated with three independent single-phase powers, together with the schematic description as follows: Please refer to FIG. 1 for the intelligence of the present invention Schematic diagram of the circuit block of the current control device. The power supply system 100 is coupled to the vehicle load 200, and the power supply system 100 includes a power supply branch 10 and an intelligent current control device 20. The vehicle load 200 may be, for example, an electric vehicle (EV), but this is not a limitation of the present invention. The vehicle load here may also be other large power loads that may affect the original power supply configuration. The power supply branch 10 includes a disconnecting unit 12 and household loads (14-1~14-3), and the power supply branch 10 transmits (including receiving or transmitting) the total phase currents (Ia1~Ia3) of a plurality of independent phases by the power company. The intelligent current control device 20 is coupled to the disconnecting unit 12 (referred to herein as the disconnecting unit 12 may be a breaker or a fuse), a household load (14-1~14-3) and a vehicle Between loads 200, and the total phase current (Ia1~Ia3) actually transmitted by multiple independent phases correspondingly provides household phase current (Ih1~Ih3) for each phase of household load (14-1~14-3), and correspondingly A single-phase current (It1~It3) of a plurality of independent phases is transmitted to the intelligent current control device 20. After the single-phase currents (It1~It3) of multiple independent phases are controlled and converted by the intelligent current control device 20, the total charge and discharge current Ict is provided to charge the vehicle load 200, or the vehicle load 200 provides the total charge and discharge current Ict pair The intelligent current control device 20 discharges, so that bidirectional current control of the vehicle load 200 can be achieved.

Specifically, the rated power that can be used by the power supply branch 10 can be set by the power company with each user, or set by the user terminal without exceeding the rated power allocated by the power company. Among them, the intelligent current control device 20 can be based on its rating The power is set to get the rated current signal (Sr1~Sr3) of each branch, which also contains the rated phase current (Ira1~Ira3) information. Each user then divides the rated power into multiple independent branches according to actual needs, such as, but not limited to, the living room uses the same branch, the kitchen uses the same branch, and the room uses the same branch. Because the load coupled to each branch is not the same, the power consumption of each independent branch is usually different.

Taking the case where the intelligent current control device 20 charges the vehicle load 200 as an example, since the household load (14-1~14-3) of each phase may be different (for example, but not limited to, the household load 14-1 is the living room Electrical appliances that use electricity, such as televisions, and household loads 14-2 are appliances that use electricity for kitchens, such as refrigerators, and household loads 14-3 that are appliances that use electricity for rooms, such as lights. Therefore, the household phase current consumed by each phase ( Ih1~Ih3) are not the same (for example, but not limited to, TV, refrigerator, electric lamp consume 5A, 10A, 1A respectively), resulting in the rated phase current of each phase (Ira1~Ira3) minus the household phase consumed by each phase When the current (Ih1~Ih3) is obtained, the single-phase current (It1~It3) that can be used (remaining) for each phase will be different. Generally, these single-phase residual currents are used in combination with the back-end vehicle load 200, and the same current value is taken from each phase. In order to avoid that the power used by any of the phases exceeds the rated power, only the smallest set of currents in each phase will be used as a reference for charging the vehicle load 200. Therefore, when at least one of the maximum values that can be used for each phase of single-phase current (It1~It3) is different, because the total value of the single-phase current (It1~It3) that can be used is more than the conventional practice The value of the phase current with the smallest residual current multiplied by the number of current phases is still higher, so the size of the charging current in the conventional method will be limited. Therefore, the main purpose of the present invention is to use the intelligent current control device 20 to independently limit, adjust, and control the single-phase current of each phase (It1~It3), so that the power of the multi-phase power supply can be based on the rated value of each phase and Actual usage is the most effective use. Compared with the conventional method, the maximum rated power of the original setting can be achieved To shorten the charging and discharging time of the vehicle load 200 to improve the charging and discharging performance of the intelligent current control device 20.

Referring back to FIG. 1, the intelligent current control device 20 includes a plurality of first current detection units (22-1~22-3), respectively coupling the coupling points of the intelligent current control device 20 to the household load (14-1~14 -3) on the path, the household phase current (Ih1~Ih3) consumed by each phase of the household load (14-1~14-3) through the household current signal (Si1~Si3), and according to each branch The rated current signal of the circuit (Sr1~Sr3) can get the rated phase current of each phase (Ira1~Ira3). The intelligent current control device 20 performs current control on the single-phase current (It1~It3) used by the vehicle load 200 according to the household current signals (Si1~Si3) and the rated current signals (Sr1~Sr3) to make the vehicle load 200 available The maximum current used can be determined according to the combined current of each independent phase's rated phase current (Ira1~Ira3) and the corresponding phase's household phase current (Ih1~Ih3). As shown in Figure 1, the total phase current (Ia1~Ia3) of each phase, the household phase current (Ih1~Ih3) of the same phase (corresponding phase) and the same phase (corresponding phase) are supplied to the single phase for vehicle load charging The current (It1~It3) will be gathered at the nodes (N1~N3). Suppose that the current flowing from the node (N1~N3) is positive, and the current flowing into the node (N1~N3) is negative. When the vehicle load 200 is in the charging mode, that is, when the intelligent current control device 20 charges the vehicle load 200, the household phase current (Ih1~Ih3) consumed by each phase plus the same phase (corresponding phase) is supplied to the vehicle load The total phase current (Ia1~Ia3) of the same phase (corresponding phase) obtained from the single-phase current (It1~It3) for charging must be less than or equal to the rated phase current (Ira1~Ira3) of the same phase. Taking the first branch as an example, and considering the direction of the current, It1+Ih1+(-Ia1)=0, after finishing the formula, Ih1+It1=Ia1<Ira1. When the vehicle load 200 is in the discharge mode, and the power it can provide is not only used for household loads (14-1~14-3), but also has excess power that can be provided to the power company, the single phase of each phase The current (It1~It3) deducts the household phase current (Ih1~Ih3) consumed by the same phase (corresponding phase), and the remaining total phase current (Ia1~Ia3) of the same phase (corresponding phase) that can be provided to the power company must also be Respectively less than or equal to the rated phase current of the same phase (Ira1~Ira3). Also take the first branch as an example, and consider the current direction, ie (-It1)+Ih1+Ia1=0, after finishing, It1-Ih1=Ia1<Ira1. It is worth mentioning that, in one embodiment of the present invention, the rated power or rated current refers to the maximum value of electricity that each user can use. This rating is not Limited to the direct connection with the protection point of the disconnecting unit 12, it can be controlled and set arbitrarily by the power company through communication according to the contract rating to achieve the purpose of power dispatching, or the user can be within the contract rating set up.

Please refer to FIG. 2A for a schematic circuit block diagram of the first embodiment of the smart current control device of the present invention. The intelligent current control device 20 includes a plurality of power conversion units (24-1~24-n), a power detection unit 26 and a control unit 28. The power conversion unit (24-1~24-n) is a three-phase input power conversion unit, and converts the single-phase voltage (Vac1~Vac3) into the total charge and discharge voltage Vat, or converts the total charge and discharge voltage Vat into single Phase voltage (Vac1~Vac3). Each power conversion unit (24-1~24-n) receives single-phase current (It1~It3) of multiple independent phases, and according to the single-phase current (It1~It3) and the current command of the control unit 28 (Sc1~ Scn) and provide the corresponding charge and discharge current (Ic1 ~ Icn). Or each power conversion unit (24-1~24-n) receives the charge and discharge current (Ic1~Icn), and provides the corresponding single-phase current (It1~It3) according to the charge and discharge current (Ic1~Icn). The total charge-discharge current (Ic1~Icn) is the total charge-discharge current Ict, and the relationship between the single-phase current (It1~It3) and the charge-discharge current (Ic1~Icn) can be obtained by converting the relationship between simple input power and output power Get. Each power conversion unit (24-1~24-n) supplies a charge-discharge current (Ic1~Icn) to the vehicle load 200 to charge the vehicle load 200. Or the vehicle load 200 provides the charge and discharge current (Ic1~Icn) to each power conversion unit (24-1~24-n), so that the power conversion unit (24-1~24-n) according to the charge and discharge current (Ic1 ~Icn) provides single-phase current (It1~It3) to the power supply branch 10.

Specifically, since the power conversion units (24-1~24-n) are bidirectional AC to DC conversion units, after conversion, the current values of single-phase currents (It1~It3) of multiple independent phases will be The discharge current (Ic1~Icn) or the total charge-discharge current Ict is different. However, the input power of the power conversion unit (24-1~24-n) will be roughly equal to the output power (without considering the conversion efficiency of the power conversion unit). Therefore, after conversion, the current values of the single-phase currents (It1~It3) of multiple independent phases will be different from the charge and discharge currents (Ic1~Icn) or the total charge and discharge current Ict, but they will have the same corresponding relationship in power. It means the sum of the (input) power obtained by the product of the single-phase current (It1~It3) and the single-phase voltage (Vac1~Vac3) of each phase It will be roughly equal to the sum of the (output) power obtained by multiplying the total charging voltage Vat and the charge-discharge current (Ic1~Icn) output by each power conversion unit (24-1~24-n). Make the sum of multiple single-phase powers corresponding to each single-phase current (It1~It3) equal to the total charge-discharge power corresponding to the total charge-discharge current Ict.

The power detection unit 26 is coupled to the first current detection units (22-1~22-3) and the control unit 28, and receives household current signals (Si1~Si3) and rated current signals (Sr1~Sr3). The power detection unit 26 obtains the household phase current (Ih1~Ih3) used by each phase household load (14-1~14-3) through the household current signals (Si1~Si3), and according to the rated phase current signal of each phase (Sr1~Sr3) Know the rated phase current of each phase (Ira1~Ira3), and then use the information of the household current signal (Si1~Si3) and the rated phase current signal of each phase (Sr1~Sr3) to get each phase The maximum value of the phase current (It1~It3) can be used, and the phase residual current signal (Sb1~Sb3) represented by the maximum value of the single phase current (It1~It3) of each phase is provided to the control unit 28. It is worth mentioning that in one embodiment of the present invention, the power detection unit 26 can be included in the intelligent current control device 20 (as shown in FIG. 2A), or can be independent of the intelligent current control device 20, and provide The phase residual current signals (Sb1~Sb3) are sent to the control unit 28 of the intelligent current control device 20.

The control unit 28 is coupled to the power detection unit 26 and each power conversion unit (24-1~24-n), and provides current commands (Sc1~Scn) according to the phase residual current signals (Sb1~Sb3) and the handshake signal Sd, respectively ) To control the power conversion unit (24-1~24-n), so that the total charge and discharge current Ict is limited by the maximum value that can be used for each single-phase current (It1~It3). Among them, the control unit knows that the vehicle load 200 is in the charging mode or the discharging mode according to the handshaking signal Sd, and then uses the phase residual current signals (Sb1~Sb3) to calculate according to the vehicle load 200 in the charging mode or the discharging mode The extreme value of the total charge and discharge current Ict.

Specifically, when the vehicle load 200 is not coupled to the intelligent current control device 20, the maximum value that can be used for each phase of the single-phase current (It1~It3) is known. When the vehicle load 200 is coupled to the intelligent current control device 20, the control unit 28 and the vehicle load 200 communicate with each other with a handshake signal Sd (this communication is called a handshake mechanism). At this time, the control unit 28 first transmits a message to the vehicle load 200 through the handshaking signal Sd to inform the vehicle load 200 of the total charge and discharge power available. Among them, the total charge and discharge power includes voltage, electricity Due to the limitation of current or power value, the power required or available by the vehicle load 200 must be less than or equal to the maximum total charge and discharge power that the intelligent current control device 20 can still use. How much of the remaining total charge and discharge power will correspond to the sum of the maximum power that can be used for each phase of single-phase current (It1~It3) (in terms of the input power being roughly equal to the output power). The control unit 28 then receives the handshake signal Sd provided by the vehicle load 200 to know whether the vehicle load 200 is in the charging mode or the discharging mode, and how much power is required in the charging mode, or how much power can be provided in the discharging mode.

In the charging mode for charging the vehicle load 200, the control unit 28 first informs the vehicle load 200 how much maximum total charge and discharge power is available through the handshake signal Sd. Next, the control unit 28 learns the power required by the vehicle load 200 through the handshaking signal Sd (this power must be less than or equal to the maximum charge and discharge capacity that the intelligent current control device 20 can use). Finally, the control unit 28 controls the power conversion units (24-1~24-n) to provide the power required by the vehicle load 200. The state in which the vehicle load 200 discharges the intelligent current control device 20 is just the opposite of the charging state, and will not be repeated here.

Because the power conversion unit (24-1~24-n) is a complex number, it includes multiple control methods. One of the control methods is that the control unit 28 controls the power conversion unit (24-1 to 24-n) to convert the charge and discharge current (Ic1 to Icn) on average. This means that although the remaining single-phase currents (It1~It3) of each phase may be different, the charge-discharge currents (Ic1~Icn) provided by the power conversion unit (24-1~24-n) are the same. After conversion by the power conversion unit (24-1~24-n), the input current value will be different from the output current value, but the input power is equal to the output power. Therefore, for convenience of explanation, the same power point is used as an illustrative schematic . Suppose that there are three groups of power conversion units (24-1~24-3), and the remaining available power of each phase is 30W, 60W, 90W (180W in total). At this time, after the control unit 28 communicates with the vehicle load 200, the vehicle load 200 requires 180W to charge the vehicle load 200. The control unit 28 evenly distributes the power of 180W to the three groups of power conversion units (24-1~24-3), so that each group outputs an average of 60W of charging power to the vehicle load 200. The control unit 28 controls the three groups of power conversion units (24-1~24-3). The first phase of the AC terminal receives 30W/3=10W of power; the second phase restricts the reception of 60W/3=20W of power; the third phase Respectively receive 90W/3=30W of power. As a result, each group of power conversion units (24-1 to 24-3) respectively receives and supplies 60W of power (10W+20W+30W) to the vehicle load 200. By this, since the power conversion units (24-1~24-3) provide charging power on average, the charge/discharge current (Ic1~Ic3) output by each group of power conversion units (24-1~24-3) is the same. It is worth mentioning that, for the same example, the control method for the vehicle load 200 to discharge the intelligent current control device 20 is exactly opposite to the control method for charging, and will not be described here.

The second of the control methods is that the control unit 28 controls at least one of the power conversion units (24-1 to 24-n) to convert the charging and discharging currents (Ic1 to Icn). This means that not all power conversion units (24-1~24-n) operate. Taking the above example, and also from the viewpoint of the same power as an illustration. The power conversion units (24-1~24-3) can only operate in two groups or one group. Taking two groups of operations as an example, but not limited to, the control unit 28 requires a total charging power of 180W according to the vehicle load 200, and distributes 180W of power to 120W to the first group of power conversion units 24-1, and 60W to the second group Power conversion unit 24-2. Since the remaining available power of the first phase is 30W, the control unit 28 controls the first phase of the two sets of power conversion units (24-1~24-2) to receive 20W and 10W respectively; the remaining available power of the second phase is 60W, so the first The second phase receives 40W and 20W respectively; the third phase has a remaining available power of 90W, so the third phase receives 60W and 30W respectively. As a result, each group of power conversion units (24-1~24-2) receives 120W and 60W of power respectively, and provides 120W and 60W of charging power after conversion, respectively. Thereby, the charge and discharge current Ic1 output by the power conversion unit 24-1 of the first group is twice the charge and discharge current Ic2 output by the power conversion unit 24-2 of the second group, and the power conversion unit 24 of the third group -3 The charge and discharge current Ic3 output is 0. It is worth mentioning that, for the same example, the control method for the vehicle load 200 to discharge the intelligent current control device 20 is exactly opposite to the control method for charging, and will not be described here.

Please refer to FIG. 2B for a schematic circuit block diagram of the second embodiment of the intelligent current control device of the present invention. The difference between this embodiment and the embodiment of FIG. 2A is that the intelligent current control device 20' includes a single power conversion unit 24-1. The power conversion unit 24-1 receives multiple The single-phase current (It1~It3) of the vertical phase, and the charge/discharge current Ic1 is provided according to the single-phase current (It1~It3). Or the power conversion unit 24-1 receives the charging and discharging current Ic1, and provides a plurality of single-phase currents (It1 to It3) according to the charging and discharging current Ic1. Among them, the charge and discharge current Ic1 is equal to the total charge and discharge current Ict. The control unit 28 similarly outputs the current command Sc1 according to the request of the vehicle load 200 to control the power conversion unit 24-1 so that the total charge-discharge current Ict is limited by the maximum value of each single-phase current (It1~It3). Since the power conversion unit 24-1 is singular, the total charge and discharge power that the vehicle load 200 can receive is at most equal to the maximum power that the power conversion unit 24-1 can provide, even when the vehicle load 200 is discharged. It is worth mentioning that the elements and operation modes not described in this embodiment are similar to those in FIG. 2A and will not be repeated here.

Please refer to FIG. 3A for a schematic circuit block diagram of the first embodiment of the power conversion unit of the present invention. The power conversion unit 24 includes three converters (242-1~242-3), a controller 244, and three second current detection units (246-1~246-3), three converters (242-1 ~242-3) Separately couple the power supply branch 10 and the vehicle load 200, and respectively convert between the single-phase voltage (Vac1, Vac2, Vac3) and the total charging voltage Vat. According to the power conversion, each converter (242-1~242-3) receives a single-phase current (It1, It2, It3), and provides a single-phase charge and discharge current according to the single-phase current (It1, It2, It3) ( Ics1, Ics2, Ics3), the sum of single-phase charge and discharge current (Ics1, Ics2, Ics3) is the charge and discharge current (Ic1~Icn) or the total charge and discharge current Ict output by the group of power conversion units. It is worth mentioning that when the vehicle load 200 is discharged, the opposite happens.

The controller 244 is coupled to the three converters (242-1~242-3) and the control unit 28 respectively, and the control unit 28 calculates and supplies current according to the charging power demand in the handshaking signal Sd sent by the vehicle load 20 Command (Sc1~Scn) to the controller 244 of each group of power conversion units 24, so that a single controller 244 provides current control signals (Sa1~Sa3) to each converter (242-) according to a single current command (Sc1~Scn) 1~242-3) to control each converter (242-1~242-3) to receive single-phase current (It1, It2, It3) to provide single-phase charge and discharge current (Ics1, Ics2, Ics3), or Receiving single-phase charge and discharge currents (Ics1, Ics2, Ics3) respectively to provide single-phase currents (It1, It2, It3). Three second current detection units (246-1~246- 3) Coupling the controller 244, and separately detecting single-phase current signals (St1, St2, St3) representing single-phase currents (It1, It2, It3), and providing single-phase current signals (St1, St2, St3) to The controller 244 enables the controller 244 to control each converter (242-1~242-3) according to the single-phase current signals (St1, St2, St3) to adjust the size of the single-phase current (It1, It2, It3).

For example (taking the view of charging the vehicle load 200 and not considering the conversion efficiency of the power conversion unit as an illustration), when the controller 244 knows that it needs to control the power of the controller 244 through the current command (Sc1~Scn) The conversion unit 24 needs to provide 60W of charging power, and when the available single-phase power is 30W, 30W, and 20W, the controller 244 sets the first to third groups of converters (242-1~242-3) respectively Provide 30W, 20W, 10W single-phase charge and discharge power. As a result, the first to third groups of converters (242-1 to 242-3) receive 30W, 20W, and 10W single-phase power and convert to provide the same wattage of single-phase charge and discharge power. If the single-phase power reception of 30W, 20W, and 10W corresponds to the single-phase current of 3A, 2A, and 1A (It1, It2, It3), the controller 244 controls each conversion according to the single-phase current signal (St1, St2, St3) The devices (242-1~242-3) adjust the size of single-phase current (It1, It2, It3) according to 3A, 2A, 1A. It is worth mentioning that when the vehicle load 200 is discharged, the opposite happens.

Please refer to FIG. 3B for a schematic circuit block diagram of the second embodiment of the power conversion unit of the present invention. The difference between this embodiment and the embodiment of FIG. 3A is that the second current detection units (246-1~246-3) of the power conversion unit 24' are respectively coupled to the sub-units inside the converters (242-1~242-3) The controller 248 makes the converters (242-1~242-3) know the single-phase current signal (St1, St2, St3) respectively and cooperates with the controller 244 to adjust the current value of the single-phase current (It1, It2, It3) . It is worth mentioning that the elements and operation modes not described in this embodiment are similar to those in FIG. 3A and will not be repeated here.

Please refer to FIG. 4, which is a circuit block diagram of a third embodiment of the intelligent current control device of the present invention. The difference between this embodiment and the embodiment of FIG. 2A is that the intelligent current control device 20" includes three power conversion units (24-1~24-3), and the power conversion units (24-1~24-3) are single-phase The input power conversion unit. The power conversion units (24-1~24-3) each convert the single-phase voltage (Vac1~Vac3) is converted into the total charging voltage Vat, or the total charging voltage Vat is converted into a single-phase voltage (Vac1~Vac3) respectively. Each power conversion unit (24-1~24-3) receives a single group of single-phase current (It1, It2, It3), and according to the single group of single-phase current (It1, It2, It3) and the control unit 28 current commands (Sc1~Scn) correspondingly provide a single set of charge and discharge currents (Ic1, Ic2, Ic3). Or each power conversion unit (24-1~24-n) receives a single set of charge and discharge current (Ic1, Ic2, Ic3), and provides correspondingly according to the single set of charge and discharge current (Ic1, Ic2, Ic3) Single-phase single-phase current (It1, It2, It3). It is worth mentioning that the elements and operation modes not described in this embodiment are similar to those in FIG. 2A and will not be repeated here. In addition, in this embodiment, the circuit blocks inside each power conversion unit (24-1~24-3) are similar to FIG. 3A and FIG. 3B, the only difference is that the power conversion unit (24-1~24-3) only contains A single converter 242-1 and a single second current detection unit 246-1. The connection and operation mode of its internal components are similar to those of FIGS. 3A and 3B, and will not be described in detail.

Please refer to FIG. 5A for a schematic diagram of the charging control waveform of the intelligent current control device of the present invention. Under the formula that matches the vehicle load 200 as the charging mode Ih1+It1=Ia1<Ira1, the rated phase current (Ira1~Ira3) is a fixed value, and the household phase current (Ih1~Ih3) of each phase plus each The single-phase current of the phase (It1~It3) shall not exceed the rated phase current of each phase (Ira1~Ira3). Therefore, as shown in FIG. 5A, when the household phase current (Ih1~Ih3) of a certain phase rises, the single-phase current (It1~It3) of the same phase is restricted to be adjusted downwards to avoid a certain multiphase power The power used by the phase exceeds the rated power of the same phase.

Please refer to FIG. 5B for a schematic diagram of the discharge control waveform of the intelligent current control device of the present invention. Since the vehicle load 200 can discharge the power company through the intelligent current control device 20, and the power company provides the household phase current (Ih1~Ih3) to each phase household load (14-1~14-3), resulting in a single phase current per phase (It1~It3) and household phase currents (Ih1~Ih3) are in the opposite direction to the power supply direction of the power company. Therefore, the household phase current (Ih1~Ih3) consumed by the household load (14-1~14-3) is deducted, and the remaining current is the single-phase current that the vehicle load 200 can additionally provide to the power company (It1~It3). Under the formula that the vehicle load 200 is in the discharge mode It1-Ih1=Ia1<Ira1, the rated phase current (Ira1~Ira3) is a fixed value, and the single-phase current of each phase (It1~It3) minus each The household current of the phase (Ih1~Ih3) shall not exceed the rated phase current of each phase (Ira1~Ira3). Therefore, as shown in Figure 5B, when the household phase current (Ih1~Ih3) of a certain phase rises, the single-phase current (It1~It3) power supply of the same phase can be adjusted upwards to the power used by the same phase. Just exceed the rated power. If the current direction is considered, and it is assumed that the direction supplied by the power company is positive, the single-phase current (It1~It3) that the vehicle load 200 can provide is the reversed rated phase current (Ira1~Ira3) minus each phase of household Phase current (Ih1~Ih3).

However, the above is only a detailed description and drawings of preferred specific embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. All scope of the present invention should be applied as follows The scope of the patent shall prevail, and all the embodiments which conform to the spirit of the present invention and similar changes shall be included in the scope of the present invention, and anyone who is familiar with this skill in the field of the present invention can easily think about it Changes or modifications can be covered in the patent scope of the following case.

100‧‧‧Power supply system

10‧‧‧Power supply branch

12‧‧‧Breaking unit

14-1, 14-2, 14-3 ‧‧‧ household load

20‧‧‧Intelligent current control device

22-1, 22-2, 22-3‧‧‧ first current detection unit

200‧‧‧car load

Ira1, Ira2, Ira3 ‧‧‧ Rated phase current

Ia1, Ia2, Ia3 ‧‧‧ total phase current

Ih1, Ih2, Ih3 ‧‧‧ household phase current

It1, It2, It3‧‧‧single-phase current

Ict‧‧‧Total charge and discharge current

Si1, Si2, Si3 ‧‧‧ household current signal

Sr1, Sr2, Sr3 ‧‧‧ Rated current signal

Claims (15)

An intelligent current control device that performs current control on a power supply branch and a load. The intelligent current control device includes: at least one power conversion unit, and a single-phase current of a plurality of independent phases is transmitted by the power supply branch, and according to the The single-phase currents of the independent phases transmit a total charge and discharge power to charge or discharge the load; and a control unit coupled to the at least one power conversion unit; wherein the control unit controls the individual phases of the independent phases The phase current and a total phase current synthesized by a phase current of the same phase in the power supply branch are less than or equal to a rated phase current of the power supply branch, and at least one of the single-phase currents of different phases is different. The intelligent current control device as described in item 1 of the patent application scope, wherein when the intelligent current control device charges the load, the household phase current consumed by each phase plus the single phase current of the same phase is the total Phase current, the total phase current is less than or equal to the rated phase current of the same phase. The intelligent current control device as described in item 1 of the patent application scope, wherein when the load discharges the intelligent current control device, the single-phase current of each phase deducts the household phase current consumed by the same phase as the total Phase current, the total phase current is less than or equal to the rated phase current of the same phase. The intelligent current control device as described in item 1 of the patent application scope further includes: a power detection unit coupling the power supply branch and the control unit; wherein, the power detection unit detects each of the household phase currents A representative household current signal, and a phase residual current signal is provided to the control unit according to each rated phase current and each household current signal, so that the control unit obtains the total charge and discharge power based on each phase residual current signal limit. The intelligent current control device as described in item 4 of the patent application scope, wherein the at least one power conversion unit includes: at least one converter coupled to the power supply branch and the load; A controller coupled to the at least one converter and the control unit; and at least one current detection unit to respectively detect a single-phase current signal representing the single-phase current; wherein the control unit is based on the residual current of each phase The signal provides a current command to the controller, so that the controller provides at least one current control signal to the at least one converter according to the current command to control the at least one converter to receive the single-phase current to provide a single-phase charge Discharge current, or receive the single-phase charge and discharge current to provide the single-phase current, and control the at least one converter to adjust the size of the single-phase current according to the single-phase current signal. The intelligent current control device as described in item 5 of the patent application range, wherein the at least one current detection unit is coupled to the controller, and the controller receives the at least one single-phase current signal to learn and control the at least one The converter adjusts the magnitude of this single-phase current. The intelligent current control device as described in item 5 of the patent application range, wherein the current detection units are respectively coupled to the at least one converter, and the at least one converter respectively learns and adjusts the unit according to the single-phase current signal The magnitude of the phase current. The intelligent current control device as described in item 5 of the patent scope, wherein when the at least one power conversion unit is a three-phase input power conversion unit, the at least one converter and the at least one current detection unit are each three When the at least one power conversion unit is a single-phase input power conversion unit, the at least one converter and the at least one current detection unit are each one. The intelligent current control device as described in item 4 of the patent application scope, wherein the control unit and the load communicate with each other with a handshake signal, and the control unit learns a required power of the load through the handshake signal and controls the At least one power conversion unit provides the required power to the load, and the required power is less than or equal to the limit of the total charge and discharge power. The intelligent current control device as described in item 9 of the patent application scope, wherein the control unit learns the required power that the load can provide through the handshake signal, and controls the at least one power conversion The unit converts the required power to the power supply branch, and the required power needs to be less than or equal to the limit of the total charge and discharge power. The intelligent current control device as described in item 1 of the patent application scope, wherein the at least one power conversion unit is plural; the power conversion units respectively provide or receive a charge and discharge current, and the sum of the charge and discharge currents is the total charge A total charge and discharge current corresponding to the discharged power. The intelligent current control device as described in item 11 of the patent application scope, wherein the power conversion units are a three-phase input power conversion unit, the power conversion units respectively receive the single-phase currents, and according to the Phase current to provide the charge-discharge current; or the power conversion units respectively receive the charge-discharge current and provide the single-phase current according to the charge-discharge current, respectively. An intelligent current control device as described in item 12 of the patent application range, wherein the control unit controls the power conversion units to convert the charge-discharge current on average, or controls at least one of the power conversion units to convert The charge and discharge current. The intelligent current control device as described in item 11 of the patent application scope, wherein the power conversion units are a single-phase input power conversion unit, the power conversion units respectively receive the single-phase current, and respectively according to the single-phase current The charging and discharging current is provided; or the power conversion units respectively receive the charging and discharging current and provide the single-phase current according to the charging and discharging current. The intelligent current control device as described in item 1 of the patent application range, wherein the at least one power conversion unit is singular; the power conversion unit receives each single-phase current and provides the total charge and discharge power according to each single-phase current Corresponding to a total charge and discharge current; or the power conversion unit receives the total charge and discharge current, and provides each single-phase current according to the total charge and discharge current.

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