Charging and discharging circuit and control method thereof

Abstract

The invention provides a charging and discharging circuit and a control method thereof, when any first direct current / direct current conversion circuit board module performs discharging, a discharging load is turned on or turned off according to whether other first direct current / direct current conversion circuit board modules need to be charged or not, so that the function of power loss or energy recovery is achieved. In addition, the charging and discharging circuit can select different charging modes according to the charging states of the first direct current / direct current conversion circuit board module and the batteries, in other words, the charging and discharging circuit can control different batteries to perform same or different charging and discharging control according to the requirements by utilizing the control method of the charging and discharging circuit, so that the electric power of each battery is distributed, and in addition, the charging and discharging circuit can be used for charging and discharging the batteries. In addition, the charging and discharging circuit can achieve the effect of dispersing the heat energy of the circuit in a manner of arranging a distribution plate, so as to improve the heat dissipation efficiency of the charging and discharging circuit.

Description

Technical Field

[0001] The present invention relates to the field of charging and discharging, and particularly to a charging and discharging circuit and a control method thereof. Background Art

[0002] The battery charging box has a cover body and a box body. The cover body is connected to the box body in a pivoting direction. There is a groove in the box body for setting the battery. When the charging and discharging circuit formed by the traditional battery charging box performs charging and discharging on multiple batteries, it can only control the charging and discharging of each battery in the same way, resulting in poor efficiency and large consumption of the traditional charging and discharging circuit. In addition, the traditional charging and discharging circuit continuously consumes electrical energy during battery discharge, wasting the electrical energy released by the battery, and the traditional charging and discharging circuit also has the problem of excessive circuit heat energy.

[0003] Therefore, how to develop a charging and discharging circuit and a control method thereof that overcome the above disadvantages is an urgent need at present. Summary of the Invention

[0004] The purpose of the present invention is to provide a charging and discharging circuit and a control method thereof. When any first DC / DC conversion circuit board module discharges, the charging and discharging circuit uses the charging and discharging control method to turn on or off the discharge load according to whether there is other first DC / DC conversion circuit board module that needs to be charged, so as to achieve the functions of power loss or energy recovery. In addition, the charging and discharging circuit can select different charging methods according to the charging states of the first DC / DC conversion circuit board module and the battery. In other words, the charging and discharging circuit of the present invention can control different batteries to perform the same or different charging and discharging controls according to its needs by using its control method, and then distribute the power of each battery. In addition, the charging and discharging circuit of the present invention can also use the method of setting a power distribution board to achieve the effect of dispersing circuit heat energy and improve its heat dissipation efficiency.

[0005] To achieve the above object, an embodiment of the present invention is a control method, which is applied to a charge and discharge circuit and converts alternating current of an external cable to charge a plurality of batteries. The charge and discharge circuit includes a plurality of AC / DC circuit board modules, a human-machine interface board module, a plurality of first DC / DC conversion circuit board modules, and a plurality of discharge loads. Each first DC / DC conversion circuit board module is connected between a corresponding AC / DC circuit board module and a corresponding battery, and each discharge load is connected to a connection line between a corresponding AC / DC circuit board module and a corresponding first DC / DC conversion circuit board module. The control method includes the following steps. First, a power distribution board is set to split the alternating current into a plurality of sub-alternating currents to be respectively provided to the corresponding AC / DC circuit board modules. Then, the user controls the first DC / DC conversion circuit board module through the human-machine interface board module to convert the first direct current provided by the corresponding AC / DC circuit board module into power supply electric energy to charge the corresponding battery. Next, it is confirmed whether the first direct current provided by each AC / DC circuit board module is within the voltage range. When it is confirmed that the first direct current provided by each AC / DC circuit board module is not within the voltage range, the result that the first direct current is abnormal is fed back to the human-machine interface board module. When it is confirmed that the first direct current provided by each AC / DC circuit board module is within the voltage range, the user controls the corresponding first DC / DC conversion circuit board module to communicate with the corresponding battery through the human-machine interface board module to confirm their charging status. Next, it is confirmed whether the battery is abnormal. When it is confirmed that the battery is abnormal, the result that the battery is abnormal is fed back to the human-machine interface board module. When it is confirmed that the battery is not abnormal, the corresponding first DC / DC conversion circuit board module supplies power to the corresponding battery in a constant current or constant voltage manner. Next, the charging status of the corresponding first DC / DC conversion circuit board module is fed back to the human-machine interface board module. Next, it is confirmed whether the battery reaches the charging threshold. When it is confirmed that the battery does not reach the charging threshold, it is confirmed whether the corresponding AC / DC circuit board module receives a shutdown signal indicated by the user through the human-machine interface board module. When it is confirmed that the corresponding AC / DC circuit board module receives the shutdown signal indicated by the user through the human-machine interface board module, the output power of the corresponding first DC / DC conversion circuit board module is turned off.

[0006] To achieve the above object, another embodiment of the present invention is a control method, which is applied to a charge and discharge circuit and converts direct current provided by multiple batteries. The charge and discharge circuit includes multiple AC / DC circuit board modules, a human-machine interface board module, multiple first DC / DC conversion circuit board modules, and multiple discharge loads. Each first DC / DC conversion circuit board module is connected between a corresponding AC / DC circuit board module and a corresponding battery, and each discharge load is connected to a connection line between a corresponding AC / DC circuit board module and a corresponding first DC / DC conversion circuit board module. The control method includes the following steps. First, a power distribution board is set up to split the alternating current of an external cable into multiple sub-alternating currents to be provided to corresponding AC / DC circuit board modules respectively. Then, the user controls the selected first DC / DC conversion circuit board module through the human-machine interface board module to convert the direct current provided by the corresponding battery into a first direct current. Then, the user controls the selected first DC / DC conversion circuit board module to communicate with the corresponding battery through the human-machine interface board module to confirm their discharge states. Then, it is confirmed whether the voltage of the battery is within the voltage range. When it is confirmed that the voltage of the battery is not within the voltage range, an abnormal result is fed back to the human-machine interface board module. When it is confirmed that the voltage of the battery is within the voltage range, the selected first DC / DC conversion circuit board module continuously converts the direct current provided by the battery into a first direct current. Then, it is confirmed whether the first direct current converted by the first DC / DC conversion circuit board module is within the voltage range. When it is confirmed that the first direct current converted by the first DC / DC conversion circuit board module is within the voltage range, it is confirmed whether the first DC / DC conversion circuit board module charges other batteries among the multiple batteries. When it is confirmed that the first DC / DC conversion circuit board module does not charge other batteries among the multiple batteries, the discharge load is controlled to be turned on so that the first direct current converted by the first DC / DC conversion circuit board module continuously discharges to the discharge load. Then, it is confirmed whether the voltage of the battery reaches the discharge voltage. When it is confirmed that the voltage of the battery does not reach the discharge voltage, it is confirmed whether the selected first DC / DC conversion circuit board module receives a shutdown signal transmitted by the user through the human-machine interface board module. When it is confirmed that the selected first DC / DC conversion circuit board module receives the shutdown signal transmitted by the user through the human-machine interface board module, the output power of the first DC / DC conversion circuit board module is turned off.

[0007] To achieve the above object, another embodiment of the present invention is a charge and discharge circuit, and the charge and discharge circuit operates using the above two control methods. Description of the Drawings

[0008] Figure 1 It is a schematic structural diagram of the battery charging box of the present invention in a closed state;

[0009] Figure 2For Figure 1 Schematic structural diagram of the battery charging box shown when it is in the open state;

[0010] Figure 3 For Figure 1 Exploded structural diagram of the components inside the box of the battery charging box shown;

[0011] Figure 4 For Figure 1 Exploded structural diagram of the components inside the cover of the battery charging box shown;

[0012] Figure 5 Equivalent circuit block diagram of the first embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention;

[0013] Figure 6A And Figure 6B For Figure 5 Flowchart of the control method when the charge and discharge circuit shown is charging;

[0014] Figure 7A And Figure 7B For Figure 5 Flowchart of the control method when the charge and discharge circuit shown is discharging;

[0015] Figure 8 For Figure 5 Flowchart of the control method when the charge and discharge circuit shown is supplying power to the control circuit board module;

[0016] Figure 9 Equivalent circuit block diagram of the second embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention;

[0017] Figure 10 Equivalent circuit block diagram of the third embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention;

[0018] Figure 11 For Figure 10 Flowchart of the control method of the first DC / DC conversion circuit board module of the charge and discharge circuit shown;

[0019] Figure 12 Equivalent circuit block diagram of the third embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention;

[0020] Figure 13 For Figure 12 Flowchart of the control method when the charge and discharge circuit shown is charging; and

[0021] Figure 14 Flowchart of the control method of the discharge load of the charge and discharge circuit of the present invention.

[0022] The reference numerals are as follows:

[0023] 1: Battery charging box

[0024] 2: Battery

[0025] 3: Box body

[0026] 31: First housing

[0027] 311: First main accommodation space

[0028] 32: Partition board

[0029] 33: Accommodation groove

[0030] 34: Input port

[0031] 35: AC circuit board

[0032] 351: Electric energy output slot

[0033] 37: DC / DC conversion module

[0034] 38: Control panel

[0035] 381: Display screen

[0036] 382: Human-machine interface circuit

[0037] 4: Cover body

[0038] 41: Second housing

[0039] 411: Second main accommodation space

[0040] 42: First cover plate

[0041] 43: Second cover plate

[0042] 44: AC / DC conversion module

[0043] 45: Fixed foam

[0044] 5: Connector

[0045] 71: AC / DC circuit board module

[0046] 72: Small power board module

[0047] 73: Human-machine interface board module

[0048] 74: Control circuit board module

[0049] 75: First DC / DC conversion circuit board module

[0050] 76: Second DC / DC conversion circuit board module

[0051] 77: Discharge load

[0052] 78: Distribution board

[0053] 79: Diode

[0054] 80: Control circuit conversion module

[0055] 8: External cable

[0056] 9, 9a, 9b, 9c: Charge and discharge circuit

[0057] Steps: S1 - S13, M1 - M13, P1 - P7, N1 - N6, W1 - W11, K1 - K7 Detailed implementation manners

[0058] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different ways, all of which do not depart from the scope of the present invention, and the descriptions and drawings therein are for illustrative purposes in essence and not for limiting the present invention.

[0059] Please refer to Figure 1 , wherein Figure 1 is a schematic structural diagram of the battery charging box of the present invention in the closed state, Figure 2 is Figure 1 a schematic structural diagram of the battery charging box shown in the opened state, Figure 3 is Figure 1 an exploded structural diagram of the components inside the box body of the battery charging box shown, Figure 4 is Figure 1 an exploded structural diagram of the components inside the cover body of the battery charging box shown. As Figure 2 shown, the battery charging box 1 is used to charge the battery 2. Only a single battery 2 is shown in the figure. Of course, multiple batteries 2 can also be provided in the battery charging box 1 so that the battery charging box 1 can charge multiple batteries 2 simultaneously. The battery charging box 1 includes a box body 3, a cover body 4 and two connecting members 5. When the battery charging box 1 is in the closed state, as Figure 1 shown, the cover body 4 of the battery charging box 1 covers the box body 3, thereby covering the battery 2, and when the battery charging box 1 is in the opened state, as Figure 2 shown, the cover body 4 of the battery charging box 1 is pivotally connected to the box body 3 via two connecting members 5, so that the cover body 4 is unfolded from the box body 3, thereby exposing the battery 2. As Figure 3 shown, the box body 3 includes a first housing 31, a partition 32, a plurality of accommodating grooves 33, an input port 34, an AC circuit board 35, a plurality of DC / DC conversion modules 37 and a control panel 38.

[0060] As Figure 2 and Figure 3As shown, the first housing 31 includes a first main accommodation space 311 having an opening. A partition 32 is disposed in the first main accommodation space 311 of the first housing 31 and covers the opening of the first main accommodation space 311. Each accommodation groove 33 is formed by concaving inward from the upper surface of the partition 32 toward the bottom of the first housing 31 and is located in the first main accommodation space 311 of the first housing 31 for accommodating the corresponding battery 2. In this embodiment, the number of accommodation grooves 33 is nine, and the nine accommodation grooves 33 are arranged in three rows, with three in each row. In Figure 2 the battery 2 is disposed in the accommodation groove 33 located in the second column of the first row.

[0061] An input port 34 is disposed on the partition 32 for connecting to and receiving alternating current provided by an external cable (not shown). The alternating current circuit board 35 can be a control circuit board with a USB type-C connection function and is located in the first main accommodation space 311 of the first housing 31. In this embodiment, the alternating current circuit board 35 includes two power output slots 351, and the power output slots 351 can be USB type-C slots for external electronic components (not shown) to connect to and receive power. Each direct current / direct current conversion module 37 is arranged at the bottom of the first housing 31 and is located in the first main accommodation space 311 of the first housing 31, and is further located between the accommodation grooves 33 in the first column and the accommodation grooves 33 in the second column. For example, the first direct current / direct current conversion module 37 is located between the accommodation groove 33 in the first row and the first column and the accommodation groove 33 in the first row and the second column, the second direct current / direct current conversion module 37 is located between the accommodation groove 33 in the second row and the first column and the accommodation groove 33 in the second row and the second column, and the third direct current / direct current conversion module 37 is located between the accommodation groove 33 in the third row and the first column and the accommodation groove 33 in the third row and the second column. The output end of each direct current / direct current conversion module 37 further penetrates through the wall surfaces of the corresponding accommodation grooves 33 in the first column and the corresponding accommodation grooves 33 in the second column to be connected to the battery 2 disposed in the corresponding accommodation groove 33 for power transmission. In other words, the direct current / direct current conversion module 37 can only charge and discharge the batteries 2 disposed in the accommodation grooves 33 in the first column and the accommodation grooves 33 in the second column, and cannot charge and discharge the batteries 2 disposed in the accommodation grooves 33 in the third column. A control panel 38 is disposed on the partition 32 and is located in the first main accommodation space 311 of the first housing 31. The control panel 38 includes a display screen 381 and a human-machine interface circuit 382. The display screen 381 is used to display the status of the battery charging box 1 or the status of the battery 2 disposed in the battery charging box 1. The human-machine interface circuit 382 can be pressed by the user to perform corresponding control on the battery 2.

[0062] As Figure 4As shown, the cover body 4 includes a second housing 41, a first cover plate 42, a second cover plate 43, a plurality of AC / DC conversion modules 44, and a fixing foam 45. The second housing 41 of the cover body 4 is pivotally connected to the first housing 31 of the box body 3 via two connecting members 5, as Figure 2 shown. As Figure 4 shown, the second housing 41 includes a second main accommodation space 411, wherein the first cover plate 42, a plurality of AC / DC conversion modules 44, the second cover plate 43, and the fixing foam 45 are sequentially arranged in the second main accommodation space 411 of the second housing 41. The first cover plate 42 is made of metal, is arranged at the bottom of the second housing 41, and is located in the second main accommodation space 411. The second cover plate 43 is arranged in the second main accommodation space 411 of the second housing 41, wherein the first cover plate 42 is located between the second cover plate 43 and the bottom of the second housing 41. The AC / DC conversion modules 44 constitute the power supply circuit board in the battery charging box 1, and are located between the first cover plate 42 and the second cover plate 43. And in this embodiment, the number of AC / DC conversion modules 44 is three, and the three AC / DC conversion modules 44 are arranged in sequence. The fixing foam 45 is arranged on one side of the second cover plate 43 relative to the AC / DC conversion modules 44, and is used to fix the battery 2 arranged in the box body 3 when the cover body 4 of the battery charging box 1 covers the box body 3.

[0063] As Figure 1 and Figure 2 shown, the connecting member 5 is connected to one side of the box body 3 and one side of the cover body 4, so that the cover body 4 rotates around the connecting member 5, and then unfolds from the box body 3 or covers the box body 3. When the battery charging box 1 is in the closed state, as Figure 1 shown, the cover body 4 of the battery charging box 1 rotates around the connecting member 5, and then covers the box body 3. And when the battery 2 wants to use the battery charging box 1 for charging and makes the battery charging box 1 in the open state, as Figure 2 shown, the cover body 4 of the battery charging box 1 rotates around the connecting member 5, and then unfolds from the box body 3, so that the accommodation groove 33 is exposed for the battery 2 to be arranged.

[0064] Please refer to Figure 5 and cooperate with Figures 1 to 4 , wherein Figure 5 is the equivalent circuit block diagram of the first embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention. In terms of the circuit structure, Figures 1 to 4 shown, some electronic components in the battery charging box constitute a charge and discharge circuit. The charge and discharge circuit 9 includes an AC / DC circuit board module 71, a small power board module 72, a human-machine interface board module 73, a control circuit board module 74, a plurality of first DC / DC conversion circuit board modules 75, a plurality of second DC / DC conversion circuit board modules 76, and a discharge load 77. The AC / DC circuit board module 71 is composed ofFigure 4 is composed of an AC / DC conversion module 44, and the AC / DC circuit board module 71 receives the alternating current provided by the external cable 8 and converts it into a first direct current. The rated power supplied by the AC / DC circuit board module 71 can be, but is not limited to, 760W, and the first direct current converted by the AC / DC circuit board module 71 is 29V. The small power board module 72 is composed of Figure 3 the AC circuit board 35 as shown, and the small power board module 72 receives the alternating current provided by the external cable 8 and converts it into a second direct current. The second direct current converted by the small power board module 72 is 12V. The human-machine interface board module 73 is composed of Figure 3 the control panel 38 as shown to receive or output signals according to the user's selection. The control circuit board module 74 is composed of Figure 3 the AC circuit board 35 as shown. The control circuit board module 74 receives the first direct current provided by the AC / DC circuit board module 71 and converts it into the electric energy required by the power output slot 351 on the AC circuit board 35. Moreover, the control circuit board module 74 can further communicate with the human-machine interface board module 73. The first DC / DC conversion circuit board module 75 and the second DC / DC conversion circuit board module 76 are composed of Figure 3 the DC / DC conversion module 37 as shown, and as can be seen from Figure 3 , since the first DC / DC conversion circuit board module 75 and the second DC / DC conversion circuit board module 76 are integrated on the DC / DC conversion module 37 and are arranged between the corresponding two accommodation slots 33, it can achieve the effect of saving space. In this embodiment, the number of the first DC / DC conversion circuit board modules 75 is equal to the number of the batteries 2 that can be accommodated in the battery charging box 1, that is, the number of the first DC / DC conversion circuit board modules 75 is six. Each first DC / DC conversion circuit board module 75 receives and converts the first direct current provided by the AC / DC circuit board module 71 to provide charging for the corresponding battery 2. Or, each first DC / DC conversion circuit board module 75 receives and converts the electric energy provided by the corresponding battery 2 into the first direct current. And in this embodiment, the first DC / DC conversion circuit board modules 75 are respectively connected to the control circuit board module 74 and the human-machine interface board module 73 through communication lines (that is Figure 5The dotted-line circuits) are connected to each other to provide a pipeline for exchanging data information with each other. In this embodiment, the number of the second DC / DC conversion circuit board modules 76 is equal to half of the number of the batteries 2 that can be accommodated in the battery charging box 1, that is, the number of the second DC / DC conversion circuit board modules 76 is three. One end of each second DC / DC conversion circuit board module 76 is connected to the small power board module 72 and the human-machine interface board module 73, and the other end of each second DC / DC conversion circuit board module 76 is connected to two corresponding batteries 2, receiving and converting the electric energy provided by the corresponding batteries 2 to the small power board module 72 and the human-machine interface board module 73. In other words, when the external cable 8 cannot supply alternating current to the small power board module 72 and the human-machine interface board module 73, the second DC / DC conversion circuit board module 76 can supply power to the small power board module 72 and the human-machine interface board module 73 by using alternative electric energy. The discharge load 77 can be composed of a switch and a resistor, and is connected to the wire between the AC / DC circuit board module 71 and the first DC / DC conversion circuit board module 75. When the battery 2 has a discharge requirement, the discharge load 77 will be controlled to turn on to consume electric energy, and its control method will be described later.

[0065] Please refer to Figure 6A and Figure 6B and in cooperation with Figure 5 , wherein Figure 6A and Figure 6B are Figure 5Flowchart of the control method of the charging and discharging circuit shown during charging. First, step S1 is executed, and the charging and discharging circuit 9 receives electrical energy, where the electrical energy can be the first direct current converted from the alternating current provided by the external cable 8 and converted by the AC / DC circuit board module 71, or the first direct current converted from the direct current provided by the battery 2 and converted by the first DC / DC conversion circuit board module 75. Next, step S2 is executed. In this step, the charging and discharging circuit 9 is initialized. In this step, the electrical energy received by the charging and discharging circuit 9 (such as the alternating current received by the charging and discharging circuit 9), the human-machine interface board module 73, and the first DC / DC conversion circuit board module 75 are initialized. Next, step S3 is executed. The user controls the first DC / DC conversion circuit board module 75 through the human-machine interface board module 73 to convert the first direct current provided by the AC / DC circuit board module 71 into power supply electrical energy to charge the corresponding battery 2. Next, step S4 is executed to confirm whether the first direct current provided by the AC / DC circuit board module 71 is within the voltage range. When the confirmation result of step S4 is no, that is, when the first direct current provided by the AC / DC circuit board module 71 is not within the voltage range, step S5 is executed to feedback the result that the first direct current provided by the AC / DC circuit board module 71 is abnormal to the human-machine interface board module 73. After step S5 is executed, step S3 is executed again. When the confirmation result of step S4 is yes, that is, when the first direct current provided by the AC / DC circuit board module 71 is within the voltage range, step S6 is executed. The user controls the first DC / DC conversion circuit board module 75 to communicate with the corresponding battery 2 through the human-machine interface board module 73 to confirm their charging status. After step S6 is executed, step S7 is executed to confirm whether the battery 2 is abnormal. When the confirmation result of step S7 is yes, that is, when it is confirmed that the battery 2 is abnormal, step S8 is executed to feedback the result that the battery 2 is abnormal to the human-machine interface board module 73. After step S8 is executed, step S3 is executed again. When the confirmation result of step S7 is no, that is, when it is confirmed that the battery 2 is normal, step S9 is executed, and the first DC / DC conversion circuit board module 75 supplies power to the corresponding battery 2 in a constant current or constant voltage manner. Next, step S10 is executed to feedback the charging status of the first DC / DC conversion circuit board module 75 to the human-machine interface board module 73. Next, step S11 is executed to confirm whether the battery 2 has reached a charging threshold, that is, to confirm whether the battery 2 has been fully charged. When the confirmation result of step S11 is no, that is, when the battery 2 has not reached the charging threshold, step S12 is executed to confirm whether the AC / DC circuit board module 71 has received the shutdown signal indicated by the user through the human-machine interface board module 73. When the confirmation result of step S12 is no, that is, when it is confirmed that the AC / DC circuit board module 71 has not received the shutdown signal indicated by the user through the human-machine interface board module 73, step S10 is executed again.When the confirmation result of step S12 is yes, that is, it is confirmed that the AC / DC circuit board module 71 has received the shutdown signal indicated by the user through the human-machine interface board module 73, then step S13 is executed to turn off the output power of the first DC / DC conversion circuit board module 75. After executing step S13, step S3 is executed again. When the confirmation result of step S11 is yes, that is, when the battery 2 reaches the charging threshold, then step S13 is directly executed.

[0066] Please refer to Figure 7A and Figure 7B and cooperate with Figure 5 , where Figure 7A and Figure 7B are Figure 5Flowchart of the control method of the charge and discharge circuit shown during discharge. First, step M1 is executed. The charge and discharge circuit 9 receives electrical energy, where the electrical energy can be the first direct current converted from the alternating current provided by the external cable 8 and converted by the AC / DC circuit board module 71, or the first direct current converted from the direct current provided by the battery 2 and converted by the first DC / DC conversion circuit board module 75. Then, step M2 is executed. The charge and discharge circuit 9 is initialized. In this step, the electrical energy received by the charge and discharge circuit 9, the human-machine interface board module 73, the control circuit board module 74, and the first DC / DC conversion circuit board module 75 are initialized. Then, step M3 is executed. The user controls the selected first DC / DC conversion circuit board module 75 through the human-machine interface board module 73 to convert the electrical energy provided by the corresponding battery 2 into the first direct current. Then, step M4 is executed. The user controls the selected first DC / DC conversion circuit board module 75 to communicate with the corresponding battery 2 through the human-machine interface board module 73 to confirm their discharge states. Then, step M5 is executed. It is confirmed whether the voltage of the battery 2 is within the voltage range. When the confirmation result of step M5 is no, that is, when the voltage of the battery 2 is not within the voltage range, step M6 is executed to feedback the abnormal result to the human-machine interface board module 73. After step M6 is executed, step M3 is executed again. When the confirmation result of step M5 is yes, that is, when the voltage of the battery 2 is within the voltage range, step M7 is executed. The selected first DC / DC conversion circuit board module 75 continuously converts the electrical energy provided by the battery 2 into the first direct current. Then, step M8 is executed. It is confirmed whether the first direct current converted by the first DC / DC conversion circuit board module 75 is within the voltage range. When the confirmation result of step M8 is no, that is, when the first direct current converted by the first DC / DC conversion circuit board module 75 is not within the voltage range, step M6 is executed again. When the confirmation result of step M8 is yes, that is, when the first direct current converted by the first DC / DC conversion circuit board module 75 is within the voltage range, step M9 is executed. It is confirmed whether the first DC / DC conversion circuit board module 75 charges other batteries 2. When the confirmation result of step M9 is no, that is, when it is confirmed that the first DC / DC conversion circuit board module 75 does not charge other batteries 2, step M10 is executed to control the discharge load 77 to be turned on so that the first direct current converted by the first DC / DC conversion circuit board module 75 continuously discharges to the discharge load 77 to achieve the effect of power consumption. Then, step M11 is executed. It is confirmed whether the voltage of the battery 2 reaches a discharge voltage. When the confirmation result of step M11 is no, that is, when it is confirmed that the voltage of the battery 2 does not reach the discharge voltage, step M12 is executed. It is confirmed whether the selected first DC / DC conversion circuit board module 75 receives a shutdown signal transmitted by the user through the human-machine interface board module 73.When the confirmation result of step M12 is yes, that is, it is confirmed that the selected first DC / DC conversion circuit board module 75 has received the shutdown signal transmitted by the user through the human-machine interface board module 73, step M13 is executed to turn off the output power of the first DC / DC conversion circuit board module 75. When the confirmation result of step M12 is no, that is, it is confirmed that the selected first DC / DC conversion circuit board module 75 has not received the shutdown signal transmitted by the user through the human-machine interface board module 73, step M8 is re-executed. When the confirmation result of step M9 is yes, that is, it is confirmed that the first DC / DC conversion circuit board module 75 is simultaneously charging other batteries 2, step M11 is directly executed. When the confirmation result of step M11 is yes, that is, it is confirmed that the voltage of the battery 2 has reached the discharge voltage, step M13 is directly executed.

[0067] As can be seen from this control method, when the charge-discharge circuit 9 discharges any first DC / DC conversion circuit board module 75, if there is no other first DC / DC conversion circuit board module 75 that needs to be charged, the discharge load 77 is turned on to continuously discharge the first direct current converted by the selected first DC / DC conversion circuit board module 75 to the discharge load 77 to achieve the effect of power loss; if there is other first DC / DC conversion circuit board module 75 that needs to be charged, the discharge load 77 is not turned on (i.e., the discharge load 77 is in the off state) to supply the first direct current converted by the selected first DC / DC conversion circuit board module 75 to other first DC / DC conversion circuit board modules 75 that need to be charged to achieve the function of energy recovery. And according to Figure 6A and Figure 6B and Figure 7A and Figure 7B the control method, the charge-discharge circuit 9 can control different batteries 2 to perform the same or different charge-discharge controls according to its needs, thereby distributing the power of each battery 2.

[0068] Please refer to Figure 8 and cooperate with Figure 5 , in which Figure 8 is Figure 5Flowchart of the control method of the charge and discharge circuit when the control circuit board module is powered. First, step P1 is executed. The charge and discharge circuit 9 receives electrical energy, where the electrical energy can be the first direct current converted from the alternating current provided by the external cable 8 and converted by the AC / DC circuit board module 71, or the first direct current provided by the battery 2 and converted by the first DC / DC conversion circuit board module 75. Then, step P2 is executed to initialize the charge and discharge circuit 9. In this step, the control circuit board module 74 and the first DC / DC conversion circuit board module 75 are initialized. Then, step P3 is executed. According to the voltage value of the first direct current, the control circuit board module 74 outputs a corresponding output voltage. For example, when the first direct current is 29V, the output voltage of the control circuit board module 74 is 5 - 20V, and when the first direct current is 17V, the output voltage of the control circuit board module 74 is 5 - 15V. Then, step P4 is executed to feedback the circuit state of the control circuit board module 74 to the human-machine interface board module 73. Then, step P5 is executed. The user confirms whether a shutdown signal is received through the human-machine interface board module 73. When the confirmation result of step P5 is no, step P3 is executed again. When the confirmation result of step P5 is yes, step P6 is executed to control the control circuit board module 74 to stop outputting power. Then, step P7 is executed to confirm whether the first direct current is within the voltage range. When the confirmation result of step P7 is yes, step P3 is executed again. When the confirmation result of step P7 is no, step P6 is executed again. Through the above control method, in addition to charging and discharging the battery 2, the charge and discharge circuit 9 can also supply power using the control circuit board module 74, and the control circuit board module 74 can change its output voltage according to different input voltages to supply power according to different requirements.

[0069] According to Figure 5 It can be seen that all the first DC / DC conversion circuit board modules 75 of the charge and discharge circuit 9 are of the same voltage. Therefore, when the charge and discharge circuit 9 uses Figures 6A to 8 the control method to control electrical energy, the larger power can be used to quickly charge the battery 2 with demand according to the power distribution method, and the other batteries 2 are charged with the remaining power, so that the batteries 2 with fast charging requirements can be satisfied.

[0070] Please refer to Figure 9 and cooperate with Figures 1 to 4 where Figure 9 is the equivalent circuit block diagram of the second embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention. Compared with Figure 5The charging and discharging circuit 9. The charging and discharging circuit 9a of this embodiment further includes a power distribution board 78, which is arranged between the external cable 8 and multiple AC / DC circuit board modules 71, and is used to split the alternating current provided by the external cable 8 into three sub-alternating currents to be respectively provided to the corresponding AC / DC circuit board modules 71. And compared with Figure 5 The charging and discharging circuit 9 only has a single AC / DC circuit board module 71. The charging and discharging circuit 9a of this embodiment includes three AC / DC circuit board modules 71. Each AC / DC circuit board module 71 receives and converts the corresponding sub-alternating current to output to the corresponding two first DC / DC conversion circuit board modules 75 and the corresponding one second DC / DC conversion circuit board module 76. The rated power supplied by each AC / DC circuit board module 71 can be but is not limited to 300W. And compared with Figure 5 The charging and discharging circuit 9 only has a single discharge load 77. The charging and discharging circuit 9a of this embodiment includes three discharge loads 77. Each discharge load 77 is connected to the wire between the corresponding AC / DC circuit board module 71 and the corresponding first DC / DC conversion circuit board module 75. And the charging and discharging circuit 9a of this embodiment further includes three diodes 79. The anode of each diode 79 is connected to the wire between the corresponding AC / DC circuit board module 71 and the corresponding first DC / DC conversion circuit board module 75, and the cathode of each diode 79 is connected to the control circuit board module 74 to supply power to the control circuit board module 74 according to the voltage difference between the wire and the control circuit board module 74. In other words, the charging and discharging circuit 9a of this embodiment includes a three-phase conversion circuit, and each phase conversion circuit is used to supply power to the corresponding two batteries 2. Each phase conversion circuit includes an AC / DC circuit board module 71, two corresponding first DC / DC conversion circuit board modules 75, a corresponding second DC / DC conversion circuit board module 76, a corresponding discharge load 77 and a corresponding diode 79. Each phase conversion circuit of the charging and discharging circuit 9a of this embodiment can also use the Figures 6A to 8 control method described above for charging and discharging control, so that the charging and discharging circuit 9a of this embodiment can use the power distribution board 78 to achieve the effect of dispersing the circuit heat energy and improve its heat dissipation efficiency. And in this embodiment, the two batteries 2 that perform charging and discharging within the same phase conversion circuit can be configured for charging and discharging. For example, the electric energy discharged by the battery 2 that discharges using any one phase conversion circuit can be recharged into the battery 2 that charges using the same phase conversion circuit, so as to achieve the effect of energy saving. In addition, in this embodiment, if an electronic component in any one phase conversion circuit is damaged, the other phase conversion circuits can be used for operation, so that the overall charging and discharging circuit 9a can operate normally.

[0071] Please refer to Figure 10 and cooperate with Figures 1 to 4 whereFigure 10 This is an equivalent circuit block diagram of the third embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention. Compared with Figure 9 the charge and discharge circuit 9a, the output terminals of all the AC / DC circuit board modules 71 and the output terminals of all the first DC / DC conversion circuit board modules 75 of the charge and discharge circuit 9b in this embodiment are connected through a communication line (i.e., Figure 10 the dotted line in Figure 9 ), and through the mutual sharing of current information in the communication protocol, the charge and discharge circuit 9a adjusts the output current according to the content of the current information, so that it has the ability of current sharing. The charge and discharge circuit 9b in this embodiment is similar to Figures 6A to 8 the charge and discharge circuit 9a and includes a three-phase conversion circuit, and each phase conversion circuit can also perform charge and discharge control by using the control method described above

[0072] to achieve the effect of dispersing the heat energy of the circuit and improving its heat dissipation efficiency. In addition, since the charge and discharge circuit 9b in this embodiment has the ability of current sharing, the charge and discharge circuit 9b in this embodiment can distribute the power for charging and discharging the battery 2 by the method of converting the power direction of the first DC / DC conversion circuit board module 75 in each phase conversion circuit. For example, the discharged battery 2 can be converted by the first DC / DC conversion circuit board module 75 and supplied to the battery 2 that needs to be charged. In addition, if an electronic component in any phase conversion circuit is damaged, the power of other phase conversion circuits can be distributed to the damaged conversion circuit through the human-machine interface board module 73 to maintain its operation.

[0072] In addition to being able to perform charge and discharge control by using the control method described above Figures 6A to 8 , the charge and discharge circuit 9b in this embodiment can also control the operation of the first DC / DC conversion circuit board module 75 by confirming the state of the AC / DC circuit board module 71. Please refer to Figure 11 and cooperate with Figure 10 , where Figure 11 is Figure 10Flowchart of the control method for the first DC / DC conversion circuit board module of the charge and discharge circuit shown. First, step N1 is executed, and the charge and discharge circuit 9b receives electrical energy, where the electrical energy is the alternating current provided by the external cable 8. Next, step N2 is executed. In this step, the charge and discharge circuit 9b is initialized. In this step, the AC / DC circuit board module 71 and the human-machine interface board module 73 are initialized. Next, step N3 is executed, and the user transmits a communication feedback command to the AC / DC circuit board module 71 through the human-machine interface board module 73. Next, step N4 is executed, and it is confirmed through the human-machine interface board module 73 whether the AC / DC circuit board module 71 responds to the communication feedback command. When the confirmation result of step N4 is no, that is, when it is confirmed that the AC / DC circuit board module 71 does not respond to the communication feedback command, step N5 is executed, and the AC / DC circuit board module 71 is controlled through the human-machine interface board module 73 to reduce the maximum output power value. After step N5 is executed, step N3 is executed again. When the confirmation result of step N4 is yes, that is, when it is confirmed that the AC / DC circuit board module 71 responds to the communication feedback command, step N6 is executed, and it is confirmed whether the output voltage of the AC / DC circuit board module 71 is within the protection voltage range. When the confirmation result of step N6 is yes, that is, when the output voltage of the AC / DC circuit board module 71 is within the protection voltage range, step N3 is executed again. When the confirmation result of step N6 is no, that is, when the output voltage of the AC / DC circuit board module 71 is not within the protection voltage range, step N5 is executed.

[0073] Please refer to Figure 12 and in conjunction with Figures 1 to 4 , where Figure 12 is an equivalent circuit block diagram of the third embodiment of the charge and discharge circuit constituted by the battery charging box of the present invention. In terms of the circuit structure, the charge and discharge circuit 9c of this embodiment includes a plurality of AC / DC circuit board modules 71, small power board modules 72, human-machine interface board modules 73, control circuit board modules 74, a plurality of discharge loads 77, a power distribution board 78, and a control circuit conversion module 80. Among them, the power distribution board 78, small power board module 72, human-machine interface board module 73, control circuit board module 74, and a plurality of discharge loads 77 of the charge and discharge circuit 9c of this embodiment are similar to Figure 9The charge and discharge circuit 9a shown is not described herein again. The number of AC / DC circuit board modules 71 of the charge and discharge circuit 9c in this embodiment is six. Each AC / DC circuit board module 71 is connected between the power distribution board 78 and the corresponding battery 2 to directly transmit the converted sub-alternating current provided by the power distribution board 78 to the corresponding battery 2, where the rated power supplied by each AC / DC circuit board module 71 can be but is not limited to 110W. The control circuit conversion module 80 is connected between the power distribution board 78 and the control circuit board module 74, and is also connected between the power distribution board 78 and the battery 2 to transmit the converted sub-alternating current provided by the power distribution board 78 to the control circuit board module 74 and / or the battery 2, where the rated power supplied by the control circuit conversion module 80 can be but is not limited to 80W.

[0074] In this embodiment, the charge and discharge circuit 9c directly charges the battery with the electric energy converted by the AC / DC circuit board module 71. The control method thereof will be described below. Please refer to Figure 13 and cooperate with Figure 12 , where Figure 13 is Figure 12Flowchart of the control method of the charging and discharging circuit shown during charging. First, step W1 is executed. The charging and discharging circuit 9c receives electrical energy, where the electrical energy can be the alternating current provided by the external cable 8 and the first direct current after being converted by the AC / DC circuit board module 71. Next, step W2 is executed. The charging and discharging circuit 9c is initialized. In this step, the AC / DC circuit board module 71 and the human-machine interface board module 73 are initialized. Next, step W3 is executed. The user controls the AC / DC circuit board module 71 to communicate with the corresponding battery 2 through the human-machine interface board module 73 to confirm their charging status. Next, step W4 is executed. It is confirmed whether the battery 2 is abnormal. When the confirmation result of step W4 is yes, that is, when it is confirmed that the battery 2 is abnormal, step W5 is executed. The result that the battery 2 is abnormal is fed back to the human-machine interface board module 73. After step W5 is executed, step W3 is executed again. When the confirmation result of step W4 is no, that is, when it is confirmed that the battery 2 is normal, step W6 is executed. It is confirmed through the human-machine interface board module 73 whether a charging confirmation signal provided by the user is received. When the confirmation result of step W6 is yes, that is, when it is confirmed that the charging confirmation signal provided by the user is received, step W7 is executed. The AC / DC circuit board module 71 supplies power to the corresponding battery 2 in a constant current or constant voltage manner. Next, step W8 is executed. The charging status of the AC / DC circuit board module 71 is fed back to the human-machine interface board module 73. Next, step W9 is executed. It is confirmed whether the battery 2 reaches a charging threshold, that is, it is confirmed whether the battery 2 is fully charged. When the confirmation result of step W9 is no, that is, when the battery 2 has not reached the charging threshold, step W10 is executed. It is confirmed whether the AC / DC circuit board module 71 receives a shutdown signal indicated by the user through the human-machine interface board module 73. When the confirmation result of step W10 is no, that is, when it is confirmed that the AC / DC circuit board module 71 does not receive a shutdown signal indicated by the user through the human-machine interface board module 73, step W9 is executed again. When the confirmation result of step W10 is yes, that is, when it is confirmed that the AC / DC circuit board module 71 receives a shutdown signal indicated by the user through the human-machine interface board module 73, step W11 is executed. The output power of the AC / DC circuit board module 71 is turned off. After step W11 is executed, step W3 is executed again. When the confirmation result of step W9 is yes, that is, when the battery 2 reaches the charging threshold, step W11 is directly executed. When the confirmation result of step W6 is no, that is, when it is confirmed that the charging confirmation signal provided by the user is not received, step W3 is executed again.

[0075] Please refer to Figure 14 and cooperate with Figure 12 where Figure 14Flowchart of the control method for the discharge load of the charge and discharge circuit of the present invention. First, step K1 is executed. The charge and discharge circuit 9 receives electrical energy, where the electrical energy can be alternating current provided by the external cable 8 and the first direct current after being converted by the AC / DC circuit board module 71. Next, step K2 is executed. The charge and discharge circuit 9 is initialized. In this step, the AC / DC circuit board module 71 and the human-machine interface board module 73 are initialized. Next, step K3 is executed. The user selects whether to discharge the battery 2 through the human-machine interface board module 73. When the confirmation result of step K3 is no, that is, when it is selected not to discharge the battery 2, step K3 is executed again. When the confirmation result of step K3 is yes, that is, when it is selected to discharge the battery 2, step K4 is executed to control the corresponding discharge load 77 to be turned on. Next, step K5 is executed to confirm whether the voltage of the battery 2 reaches a discharge voltage. When the confirmation result of step K5 is no, that is, when the voltage of the battery 2 does not reach the discharge voltage, step K6 is executed to confirm whether the user stops discharging the battery 2 through the human-machine interface board module 73. When the confirmation result of step K6 is no, that is, when it is confirmed that the user does not stop discharging the battery 2 through the human-machine interface board module 73, step K5 is executed again. When the confirmation result of step K6 is yes, that is, when it is confirmed that the user stops discharging the battery 2 through the human-machine interface board module 73, step K7 is executed to control the corresponding discharge load 77 to be turned off. Then, step K3 is executed again. When the confirmation result of step K5 is yes, that is, when the voltage of the battery 2 reaches the discharge voltage, step K7 is directly executed.

[0076] In summary, the charge and discharge circuit of the present invention uses the above charge and discharge control method. When any first DC / DC conversion circuit board module discharges, according to whether there is other first DC / DC conversion circuit board module that needs to be charged, the discharge load is turned on or off to achieve the function of power loss or energy recovery. In addition, the charge and discharge circuit can select different charging methods according to the charging status of the first DC / DC conversion circuit board module and the battery. In other words, the charge and discharge circuit of the present invention can control different batteries to perform the same or different charge and discharge controls according to its needs through its control method, and then distribute the power of each battery. In addition, the charge and discharge circuit of the present invention can also use the method of setting a power distribution board to achieve the effect of dispersing the heat energy of the circuit and improve its heat dissipation efficiency.

Claims

1. A control method, applied to a charging and discharging circuit, and converting an alternating current of an external cable to charge a plurality of batteries, the charging and discharging circuit comprising a plurality of AC / DC circuit board modules, a human-machine interface board module, a plurality of first DC / DC conversion circuit board modules and a plurality of discharge loads, each of the first DC / DC conversion circuit board modules being connected between the corresponding AC / DC circuit board module and the corresponding battery, each of the discharge loads being connected to a connection line between the corresponding AC / DC circuit board module and the corresponding first DC / DC conversion circuit board module, wherein the control method comprises: (a) providing a power distribution board to divide the AC power into a plurality of sub-AC power to be provided to the corresponding AC / DC circuit board modules respectively; (b) the user controls the first DC / DC conversion circuit board module through the human-machine interface board module to convert a first DC power provided by the corresponding AC / DC circuit board module into power supply energy to charge the corresponding battery; (c) confirming whether the first DC power provided by each of the AC / DC circuit board modules is within a voltage range; (d) when the confirmation result of step (c) is no, feeding back a result indicating that the first direct current is abnormal to the human-machine interface board module; (e) When the confirmation result of step (c) is yes, the user controls the corresponding first DC / DC conversion circuit board module to communicate with the corresponding battery through the human-machine interface board module to confirm the charging status of each other; (f) confirm whether the battery is abnormal; (g) when the confirmation result of step (f) is yes, feeding back a result indicating that the battery is abnormal to the human-machine interface board module; (h) when the confirmation result of step (f) is no, the corresponding first DC / DC conversion circuit board module supplies power to the corresponding battery in a constant current or constant voltage manner; (i) feeding back the charging status of the corresponding first DC / DC conversion circuit board module to the human-machine interface board module; (j) confirming whether the battery has reached a charging threshold; (k) when the confirmation result of step (j) is no, confirming whether the corresponding AC / DC circuit board module receives a shutdown signal indicated by the user through the human-machine interface board module; as well as (l) When the confirmation result of step (k) is yes, turn off the output power of the corresponding first DC / DC conversion circuit board module.

2. The control method as claimed in claim 1, wherein before step (a), the method further comprises initializing the alternating current received by the charge and discharge circuit, the human-machine interface board module and the first DC / DC conversion circuit board module.

3. The control method as described in claim 1, wherein step (b) is re-executed after step (d) is executed, step (b) is re-executed after step (g) is executed, step (i) is re-executed when the confirmation result of step (k) is no, step (l) is executed when the confirmation result of step (j) is yes, and step (b) is re-executed after step (l) is executed.

4. A control method, applied to a charge-discharge circuit, and converting a DC power provided by a plurality of batteries, the charge-discharge circuit comprising a plurality of AC / DC circuit board modules, a human-machine interface board module, a plurality of first DC / DC conversion circuit board modules and a plurality of discharge loads, each of the first DC / DC conversion circuit board modules being connected between the corresponding AC / DC circuit board module and the corresponding battery, each of the discharge loads being connected to a connection line between the corresponding AC / DC circuit board module and the corresponding first DC / DC conversion circuit board module, wherein the control method comprises: (a) a power distribution board is provided to divide an AC power of an external cable into a plurality of sub-AC power to be respectively provided to the corresponding AC / DC circuit board modules; (b) the user controls the selected first DC / DC conversion circuit board module through the human-machine interface board module to convert the DC power provided by the corresponding battery into a first DC power; (c) the user controls the selected first DC / DC conversion circuit board module to communicate with the corresponding battery through the human-machine interface board module to confirm the discharge status of each other; (d) confirming whether the voltage of the battery is within a voltage range; (e) when the confirmation result of step (d) is negative, feeding back the abnormal result to the human-machine interface board module; (f) When the confirmation result of step (d) is yes, the selected first DC / DC conversion circuit board module continues to convert the DC power provided by the battery into the first DC power; (g) confirming whether the first DC power converted by the first DC / DC conversion circuit board module is within the voltage range; (h) when the confirmation result of step (g) is yes, confirm whether the first DC / DC conversion circuit board module charges other batteries among the plurality of batteries; (i) when the confirmation result of step (h) is no, controlling the discharge load to be turned on so that the first DC power converted by the first DC / DC conversion circuit board module is continuously discharged to the discharge load; (j) confirming whether the voltage of the battery reaches a discharge voltage; (k) when the confirmation result of step (j) is no, confirming whether the selected first DC / DC conversion circuit board module receives a shutdown signal transmitted by the user through the human-machine interface board module; as well as (l) When the confirmation result of step (k) is yes, turn off the output power of the first DC / DC conversion circuit board module.

5. The control method as claimed in claim 4, wherein before step (a), the method further comprises initializing the DC power received by the charge and discharge circuit, the human-machine interface board module and the first DC / DC conversion circuit board module.

6. The control method as described in claim 4, wherein step (b) is re-executed after step (e) is executed, step (e) is re-executed when the confirmation result of step (g) is no, step (h) is re-executed when the confirmation result of step (j) is yes, step (l) is executed when the confirmation result of step (j) is yes, step (g) is re-executed when the confirmation result of step (k) is no, and step (b) is re-executed after step (l) is executed.

7. A charge-discharge circuit for converting electric energy, wherein the charge-discharge circuit operates using the above-mentioned claim 1 and / or 4.

8. The charging and discharging circuit as described in claim 7, wherein each of the AC / DC circuit board modules is connected between the power distribution board and the corresponding first DC / DC conversion circuit board module to convert the corresponding sub-AC power into DC power to provide it to the corresponding first DC / DC conversion circuit board module.

9. The charge and discharge circuit as described in claim 7, wherein the charge and discharge circuit comprises a plurality of diodes, an anode of each diode is connected to a wire between the corresponding AC / DC circuit board module and the corresponding first DC / DC conversion circuit board module, and a cathode of each diode is connected to a control circuit board module.

10. The charge and discharge circuit as claimed in claim 7, wherein the charge and discharge circuit comprises a small power board module and a plurality of second DC / DC conversion circuit board modules, the small power board module receives and converts the AC power into a second DC power, one end of each of the second DC / DC conversion circuit board modules is connected to the small power board module and the human-machine interface board module, and the other end of each of the second DC / DC conversion circuit board modules is connected to corresponding two of the batteries for converting the second DC power into the electrical energy of the batteries.

11. The charge and discharge circuit as claimed in claim 7, wherein the output ends of all the AC / DC circuit board modules and the output ends of all the first DC / DC conversion circuit board modules are connected via a communication line.

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