Decoupling system and direct-current power supply system

Abstract

Disclosed are a decoupling system and a direct-current power supply system. The decoupling system is coupled between a direct-current power supply array and a deflector. The decoupling system comprises a main switch device and an auxiliary switch device. The main switch device is used for controlling a main switch element of the main switch device on the basis of an external signal of an external device and generating a control signal on the basis of the external signal. The auxiliary switch device receives the control signal and controls an auxiliary switch element of the auxiliary switch device on the basis of the control signal. The main switch element and the auxiliary switch element control a system voltage value output from the direct-current power supply array to the deflector.

Description

Decoupling system and DC power supply system Technical Field

[0001] This disclosure relates to a decoupling system and a DC power supply system, and more particularly to a decoupling system and a DC power supply system for improving safety in emergency situations. Background Technology

[0002] In recent years, DC power supply (such as solar power generation) has become a widely used power supply technology. However, as the power levels, current, and voltage of DC power supply systems continue to increase, there is a risk of electric shock to maintenance personnel or rescue workers during disaster relief or other emergencies, as the DC power system (e.g., solar power generation system) continues to generate electricity as long as it receives sunlight, even in the event of an anomaly or fire in the area. Therefore, how to immediately reduce the power supplied by the DC power system in emergency or abnormal situations to improve the safety of the DC power system during disaster relief or other emergencies remains a problem to be solved.

[0003] Summary of the Invention

[0004] To address the aforementioned problems, this disclosure proposes a decoupling system coupled between a DC power supply array and a converter. The DC power supply array includes a first DC power supply device and a second DC power supply device. The decoupling system includes a main switching device and a secondary switching device. The main switching device is coupled to the first DC power supply device and receives external signals from an external device. Based on these external signals, it controls the main switching element of the main switching device and generates and transmits control signals. The secondary switching device is coupled to the second DC power supply device, receives control signals from the main switching device, and controls the secondary switching element of the secondary switching device based on these control signals. The main and secondary switching elements control the system voltage output from the DC power supply array to the converter.

[0005] This disclosure also proposes a DC power supply system, comprising a DC power supply array, multiple switching devices, and a converter. The DC power supply array includes a first DC power supply device and a second DC power supply device. The multiple switching devices include a first main switching device and a first auxiliary switching device. The first main switching device is coupled to the first DC power supply device and is used to receive a first external signal from a first external device, control a first main switching element of the first main switching device according to the first external signal, and generate and transmit a control signal according to the first external signal. The first auxiliary switching device is coupled to the second DC power supply device, receives the control signal from the first main switching device, and controls a first auxiliary switching element of the first auxiliary switching device according to the control signal. The converter is coupled to the multiple switching devices, wherein the first main switching element and the first auxiliary switching element control the system voltage value output from the DC power supply array to the converter.

[0006] It should be understood that the foregoing general description and the following specific description are merely exemplary and explanatory, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0007] To make the above and other objects, features, advantages and embodiments disclosed herein more apparent and understandable, the accompanying drawings are described below:

[0008] Figure 1 is a schematic diagram of a DC power supply system according to some embodiments of the present invention;

[0009] Figure 2 is a schematic diagram of a DC power supply system according to some embodiments of the present invention;

[0010] Figure 3 is a schematic diagram of another switching device according to some embodiments of the present invention;

[0011] Figure 4 is a schematic diagram of another switching device according to some embodiments of the present invention;

[0012] Figure 5 is a schematic diagram of another switching device according to some embodiments of the present invention;

[0013] Figure 6 is a schematic diagram of another DC power supply system according to some embodiments of the present invention;

[0014] Figure 7 is a schematic diagram of another DC power supply system according to some embodiments of the present invention;

[0015] Figure 8 is a schematic diagram of another DC power supply system according to some embodiments of the present invention; and

[0016] Figure 9 is a schematic diagram of another DC power supply system according to some embodiments of the present invention.

[0017]

Symbol Explanation

[0018] The following detailed description provides examples with reference to the accompanying drawings. However, the provided examples are not intended to limit the scope of this disclosure, and the description of the structural operation is not intended to limit the order of execution. Any structure resulting from the recombination of elements and producing a device with equivalent functionality is within the scope of this disclosure. Furthermore, the drawings are for illustrative purposes only and are not drawn to their original dimensions. For ease of understanding, the same or similar elements will be designated with the same symbols in the following description.

[0019] Please refer to Figure 1, which is a schematic diagram of a DC power supply system 100 according to some embodiments of the present invention. In Figure 1, the DC power supply system 100 includes a DC power supply array 110, a decoupling system 130, and a converter 150.

[0020] The DC power supply array 110 includes multiple DC power supply devices 112A to 112C, which are connected in series. The decoupling system 130 includes multiple switching devices 132A to 132C. In terms of connection, switching device 132A is coupled to DC power supply device 112A, switching device 132B is coupled to DC power supply device 112B, and switching device 132C is coupled to DC power supply device 112C. Furthermore, switching devices 132A and 132C are coupled to converter device 150. Switching device 132A is coupled to switching device 132B, and switching device 132B is coupled to switching device 132C. In some embodiments, switching devices 132A, 132B, and 132C are connected by power lines. In some other embodiments, switching devices 132A, 132B, and 132C are connected via a communication line (e.g., RS485). In still other embodiments, switching devices 132A, 132B, and 132C are connected via wireless communication (e.g., Bluetooth, Wi-Fi).

[0021] In some embodiments, switch device 132A is the main switch device, while switch devices 132B and 132C are auxiliary switch devices. However, this is not a limitation; 132B can be configured to be the main switch device, and 132C and 132A can be configured to be auxiliary switch devices. In the embodiment shown in FIG1, switch devices 132A, 132B, and 132C contain the same circuitry, differing only in their operation.

[0022] In some embodiments, the main switching device 132A includes a main switching element SA1, the auxiliary switching device 132B includes an auxiliary switching element SB1, and the auxiliary switching device 132C includes an auxiliary switching element SC1. In some embodiments, the main switching element and the auxiliary switching element may be relays.

[0023] In some embodiments, the main switch device 132A is further coupled to an external device 91. In the embodiment of FIG1, the external device 91 is a network or a host. In some embodiments, the external device 91 and the main switch device 132A are wired. In other embodiments, the external device 91 and the main switch device 132A are wirelessly connected.

[0024] In some embodiments, the main switching device 132A receives an external signal S1 from an external device 91 and controls the main switching element SA1 of the main switching device 132A according to the external signal S1. The main switching device 132A then generates a control signal CTR1 based on the external signal S1 and transmits the control signal CTR1 to the auxiliary switching devices 132B and 132C via a power line, communication line, or wireless communication. The auxiliary switching devices 132B and 132C then control the auxiliary switching elements SB1 and SC1 respectively according to the control signal CTR1. By controlling the conduction of the main switching element SA1 and the auxiliary switching elements SB1 and SC1, the decoupling system 130 controls the system voltage value output from the DC power supply array 110 to the converter 150. In some embodiments, the control signal CTR1 is a PLC (Power Line Communication) signal.

[0025] As shown in Figure 1, in some embodiments, switching devices 132A, 132B, and 132C respectively include a communication unit and a processing circuit. Specifically, the main switching device 132A includes a main communication circuit CA1 and a main processing circuit PA1, the secondary switching device 132B includes a secondary communication circuit CB1 and a secondary processing circuit PB1, and the secondary switching device 132C includes a secondary communication circuit CC1 and a secondary processing circuit PC1.

[0026] The main communication circuit CA1 is used to receive external signal S1 or transmit or receive control signal CTR1, and is coupled to the main processing circuit PA1. Similarly, the secondary communication circuit CB1 is used to receive external signal S1 or transmit or receive control signal CTR1, and is coupled to the secondary processing circuit PB1. The secondary communication circuit CC1 is used to receive external signal S1 or transmit or receive control signal CTR1, and is coupled to the secondary processing circuit PC1. The main communication circuit CA1, secondary communication circuit CB1, and secondary communication circuit CC1 transmit signals to each other via power lines, communication lines, or wireless communication.

[0027] In the embodiment shown in Figure 1, the main switching element SA1 is connected in series with the DC power supply device 112A, the auxiliary switching element SB1 is connected in series with the DC power supply device 112B, and the auxiliary switching element SC1 is connected in series with the DC power supply device 112C.

[0028] In operation, when an external signal contains an abnormal signal, the main processing circuit PA1 does not turn on the main switching element SA1. When the main switching element SA1 is not turned on, the DC power supply device 112A does not supply power to the converter device 150. At the same time, the main communication circuit CA1 generates a control signal CTR1 containing the abnormal signal, and transmits the control signal CTR1 to the auxiliary communication circuit CB1 and the auxiliary communication circuit CC1 via a power line, a communication line, or wireless communication.

[0029] In some embodiments, when the control signal CTR1 contains an abnormal signal, the secondary processing circuit PB1 does not turn on the secondary switching element SB1, so that the DC power supply device 112B does not supply power to the converter device 150. Similarly, when the control signal CTR1 contains an abnormal signal, the secondary processing circuit PC1 does not turn on the secondary switching element SC1, so that the DC power supply device 112C does not supply power to the converter device 150.

[0030] On the other hand, when the external signal contains a normal signal, the main processing circuit PA1 turns on the main switching element SA1. When the main switching element SA1 is turned on, the DC power supply device 112A supplies power to the converter device 150. At the same time, the main communication circuit CA1 generates a control signal CTR1 containing a normal signal, and transmits the control signal CTR1 to the auxiliary communication circuit CB1 and the auxiliary communication circuit CC1 via a power line, a communication line, or wireless communication.

[0031] In some embodiments, when the control signal CTR1 contains a normal signal, the secondary processing circuit PB1 turns on the secondary switching element SB1 to supply power from the DC power supply device 112B to the converter device 150. Similarly, when the control signal CTR1 contains a normal signal, the secondary processing circuit PC1 turns on the secondary switching element SC1 to supply power from the DC power supply device 112C to the converter device 150.

[0032] In some embodiments, the main communication circuit CA1 is further used to receive a notification signal N1 from the external device 91 and determine that the switching device 132A is the main switching device based on the notification signal N1. Then, based on the notification signal N1, the main processing circuit PA1 generates a notification signal N2 and transmits the notification signal N2 to the secondary switching devices 132B and 132C via the main communication circuit CA1 and a power line, communication line, or wireless communication method. Based on the notification signal N2, the secondary processing circuit PB1 of the secondary switching device 132B determines that the secondary switching device 132B is a slave device. Similarly, based on the notification signal N2, the secondary processing circuit PC1 of the secondary switching device 132C determines that the secondary switching device 132C is a slave device.

[0033] As illustrated in Figure 1, in some embodiments, the main switching device 132A, the auxiliary switching device 132B, and the auxiliary switching device 132C further include voltage regulator circuits DA1, DB1, and DC1, respectively. The voltage regulator circuits DA1, DB1, and DC1 are used to provide stable voltages to the main switching device 132A, the auxiliary switching device 132B, the auxiliary switching device 132C, and their respective internal circuits or components. In some embodiments, the main switching device 132A, the auxiliary switching device 132B, and the auxiliary switching device 132C further include a voltage detection circuit (not shown) and a current detection circuit (not shown), respectively. The voltage detection circuit is used to detect the voltage delivered by the DC power supply device, and the current detection circuit is used to detect the current delivered by the DC power supply device.

[0034] Please refer to Figure 2. Figure 2 is a schematic diagram of a DC power supply system 200 according to some embodiments of the present invention.

[0035] In Figure 2, the DC power supply system 200 includes a DC power supply array 210, a decoupling system 230, and a converter 250.

[0036] The DC power supply array 210 includes multiple DC power supply devices 212A to 212C, which are connected in series. The decoupling system 230 includes multiple switching devices 232A to 232C. In terms of connection, switching device 232A is coupled to DC power supply device 212A, switching device 232B is coupled to DC power supply device 212B, and switching device 232C is coupled to DC power supply device 212C. Furthermore, switching devices 232A and 232C are coupled to converter device 250. Switching device 232A is coupled to switching device 232B, and switching device 232B is coupled to switching device 232C. In some embodiments, switching devices 232A, 232B, and 232C are connected via power lines, communication lines, or wireless communication.

[0037] In some embodiments, switch device 232A is the main switch device, while switch devices 232B and 232C are auxiliary switch devices. In the embodiment shown in FIG2, switch devices 232A, 232B and 232C contain the same circuit, only differing in their operation.

[0038] In some embodiments, the main switching device 232A includes a main switching element SA2, the auxiliary switching device 232B includes an auxiliary switching element SB2, and the auxiliary switching device 232C includes an auxiliary switching element SC2.

[0039] In some embodiments, the main switch device 232A is further used to connect to the external device 92. In the embodiment of FIG2, the external device 92 is a switch. It should be noted that the external device 92 and the main switch device 232A are connected by a wire.

[0040] As illustrated in Figure 2, in some embodiments, switching devices 232A, 232B, and 232C respectively include a communication unit, a processing circuit, and a voltage detection circuit. Specifically, the main switching device 232A includes a main communication circuit CA2, a main processing circuit PA2, and a main voltage detection circuit VCA2; the secondary switching device 232B includes a secondary communication circuit CB2, a secondary processing circuit PB2, and a secondary voltage detection circuit VCB2; and the secondary switching device 232C includes a secondary communication circuit CC2, a secondary processing circuit PC2, and a secondary voltage detection circuit VCC2.

[0041] The main communication circuit CA2 is used to receive external signal S1 or transmit or receive control signal CTR2, and is coupled to the main processing circuit PA2. Similarly, the secondary communication circuit CB2 is coupled to the secondary processing circuit PB2, and the secondary communication circuit CC2 is coupled to the secondary processing circuit PC2. The main communication circuit CA2, the secondary communication circuit CB2, and the secondary communication circuit CC2 transmit signals to each other via power lines, communication lines, or wireless communication.

[0042] In the embodiment shown in Figure 2, the main switching element SA2 is connected in series with the DC power supply device 212A, the auxiliary switching element SB2 is connected in series with the DC power supply device 212B, and the auxiliary switching element SC2 is connected in series with the DC power supply device 212C.

[0043] In operation, when an abnormal condition occurs, the external device 92 is disconnected (not conducting). The main voltage detection element VSA2 in the main voltage detection circuit VCA2 detects that the voltage across resistor RA2 is a first voltage (e.g., 0), and the main voltage detection circuit VCA2 transmits the first voltage to the main processing circuit PA2. The main processing circuit PA2 does not conduct the main switching element SA2 based on the received first voltage. When the main switching element SA2 is not conducting, the DC power supply device 212A does not supply power to the converter 150. At the same time, the main communication circuit CA2 generates a control signal CTR2 containing an abnormal signal, and transmits the control signal CTR2 to the auxiliary communication circuit CB2 and the auxiliary communication circuit CC2 via power lines, communication lines, or wireless communication.

[0044] In some embodiments, when the control signal CTR2 contains an abnormal signal, the secondary processing circuit PB2 does not turn on the secondary switching element SB2, so that the DC power supply device 212B does not supply power to the converter device 250. Similarly, when the control signal CTR2 contains an abnormal signal, the secondary processing circuit PC2 does not turn on the secondary switching element SC2, so that the DC power supply device 212C does not supply power to the converter device 250.

[0045] On the other hand, under normal conditions, external device 92 is turned on. The main voltage detection element VSA2 in the main voltage detection circuit VCA2 detects that the voltage across resistor RA2 is a second voltage (e.g., 3 volts), and the main voltage detection circuit VCA2 transmits the second voltage to the main processing circuit PA2. The main processing circuit PA2 turns on the main switching element SA2 based on the received second voltage. When the main switching element SA2 is turned on, the DC power supply device 212A supplies power to the converter 250. Simultaneously, the main communication circuit CA2 generates a control signal CTR2 containing a normal signal, and transmits the control signal CTR2 to the auxiliary communication circuits CB2 and CC2 via power lines, communication lines, or wireless communication.

[0046] In some embodiments, when the control signal CTR2 contains a normal signal, the sub-processing circuit PB2 turns on the sub-switching element SB2 to supply power from the DC power supply device 212B to the converter device 250. Similarly, when the control signal CTR2 contains a normal signal, the sub-processing circuit PC2 turns on the sub-switching element SC2 to supply power from the DC power supply device 212C to the converter device 250.

[0047] In some embodiments, specifically the embodiment shown in FIG2, the main processing circuit PA2 is further configured to determine that the main switching device 232A is the master device when the main voltage detection circuit VCA2 detects a voltage difference (e.g., the voltage difference across resistor RA2 is not zero). The main processing circuit PA2 generates a notification signal N3 and transmits the notification signal N3 to the secondary switching devices 232B and 232C via the main communication circuit CA2 and power lines, communication lines, or wireless communication. After receiving the notification signal N3, the secondary communication circuits CB2 and CC2 of the secondary switching devices 232B and 232C, and the secondary processing circuits PB2 and PC2 of the secondary switching devices 232B and 232C, determine that the secondary switching devices 232B and 232C are slave devices based on the notification signal N3.

[0048] In the embodiment shown in Figure 2, the voltage detection circuit VCB2 in the secondary switching device 232B and the voltage detection circuit VCC2 in the secondary switching device 232C are not connected to the external device 92, nor do they receive external messages from the external device 92. The operation of the secondary switching devices 232B and 232C is not affected by the voltage detection circuits VCB2 or VCC2.

[0049] As illustrated in Figure 2, in some embodiments, the main switching device 232A, the auxiliary switching device 232B, and the auxiliary switching device 232C further include voltage regulator circuits DA2, DB2, and DC2, respectively. The voltage regulator circuits DA2, DB2, and DC2 are used to provide stable voltages to the main switching device 232A, the auxiliary switching device 232B, the auxiliary switching device 232C, and their respective internal circuits or components. In some embodiments, the main switching device 232A, the auxiliary switching device 232B, and the auxiliary switching device 232C further include a voltage detection circuit (not shown) and a current detection circuit (not shown), respectively. The voltage detection circuit is used to detect the voltage delivered by the DC power supply device, and the current detection circuit is used to detect the current delivered by the DC power supply device.

[0050] Please refer to Figure 3. Figure 3 is a schematic diagram of another switching device 300 according to some embodiments of the present invention. The switching device 300 shown in Figure 3 can be used to replace the switching devices 132A, 132B and 132C shown in Figure 1 or the switching devices 232A, 232B and 232C shown in Figure 2.

[0051] As shown in Figure 3, the switching device 300 includes voltage input terminals DCI31 and DCI32, voltage output terminals DCO31 and DCO32, current detection circuit CS3, voltage detection circuit VC3, voltage detection elements VS31 and VS32, voltage regulation circuit D3, processing circuit P3, communication circuit C3, switching element S3, diode DE3, and inductor LE3.

[0052] The operation of the switching device 300 shown in Figure 3 is similar to that of the switching devices 132A, 132B and 132C in Figure 1 or the switching devices 232A, 232B and 232C shown in Figure 2. The only difference is that the switching device 300 shown in Figure 3 also includes a power conversion circuit, such as a step-down circuit composed of a switching element S3, a diode DE3 and an inductor LE3.

[0053] Please refer to Figure 4. Figure 4 is a schematic diagram of another switching device 400 according to some embodiments of the present invention. The switching device 400 shown in Figure 4 can be used to replace the switching devices 132A, 132B and 132C shown in Figure 1 or the switching devices 232A, 232B and 232C shown in Figure 2.

[0054] As shown in Figure 4, the switching device 400 includes voltage input terminals DCI41 and DCI42, voltage output terminals DCO41 and DCO42, current detection circuit CS4, voltage detection circuit VC4, voltage detection elements VS41 and VS42, voltage regulation circuit D4, processing circuit P4, communication circuit C4, and switching element S4.

[0055] The switching device 400 shown in Figure 4 is similar to the switching devices 132A, 132B, and 132C in Figure 1 or the switching devices 232A, 232B, and 232C shown in Figure 2, except that in the switching device 400 shown in Figure 4, the switching element S4 is connected in parallel with the DC power supply device (e.g., DC power supply devices 112A to 112C in Figure 1 or DC power supply devices 212A to 212C in Figure 2). Furthermore, the operational differences include: in the event of an abnormal condition, the processing circuit P4 turns on the switching element S4. When the switching element S4 is on, the DC power supply device connected in parallel with the switching element S4 does not supply power to the converter. On the other hand, under normal conditions, the processing circuit P4 does not turn on the switching element S4. When the switching element S4 is not on, the DC power supply device connected in parallel with the switching element S4 supplies power to the converter.

[0056] Please refer to Figure 5. Figure 5 is a schematic diagram of another switching device 500 according to some embodiments of the present invention. The switching device 500 shown in Figure 5 can be used to replace the switching devices 132A, 132B and 132C shown in Figure 1 or the switching devices 232A, 232B and 232C shown in Figure 2.

[0057] As shown in Figure 5, the switching device 500 includes voltage input terminals DCI51 and DCI52, voltage output terminals DCO51 and DCO52, current detection circuit CS5, voltage detection circuit VC5, voltage detection elements VS51 and VS52, voltage regulation circuit D5, processing circuit P5, communication circuit C5, switching element S5, diode DE5, and inductor LE5.

[0058] The operation mode of the switching device 500 shown in Figure 5 is similar to that of the switching device 400 in Figure 4. The only difference is that the switching device 500 shown in Figure 5 also includes a power conversion circuit, such as a boost circuit composed of switching element S5, diode DE5 and inductor LE5.

[0059] Please refer to Figure 6. Figure 6 is a schematic diagram of another DC power supply system 600 according to some embodiments of the present invention. The DC power supply system 600 includes a DC power supply array 610, a decoupling system 630, and a converter 650.

[0060] The DC power supply array 610 includes multiple DC power supply devices 612A to 612I. DC power supply devices 612A to 612C are connected in series to form a first DC power supply device string; DC power supply devices 612D to 612F are connected in series to form a second DC power supply device string; and DC power supply devices 612G to 612I are connected in series to form a third DC power supply device string. The aforementioned first, second, and third DC power supply device strings are connected in parallel.

[0061] The decoupling system 630 includes multiple switching devices 632A to 632I. The switching devices 632A to 632I have a one-to-one correspondence with the DC power supply devices 612A to 612I, that is, the DC power supply device 612A is connected to the switching device 632A, the DC power supply device 612B is connected to the switching device 632B, and so on.

[0062] In the embodiment shown in Figure 6, the switching device 632G is the main switching device, while the other switching devices (including switching devices 632A to 632F and 632H to 632I) are auxiliary switching devices.

[0063] The main switch 632G in Figure 6 is wired to the external device 96 and receives external signals from the external device 96. The main switch 632G is connected to the auxiliary switch devices 632A to 632F and 632H to 632I via power lines, communication lines, or wireless communication, and transmits control signals (e.g., PLC signals) via power lines, communication lines, or wireless communication. The operation of the main switch 632G is similar to that of the main switch 132A in Figure 1 or the main switch 232A in Figure 2, while the operation of the auxiliary switch devices 632A to 632F and 632H to 632I is similar to that of the auxiliary switch devices 132B and 132C in Figure 1 or the auxiliary switch devices 232B and 232C in Figure 2.

[0064] Please refer to Figure 7. Figure 7 is a schematic diagram of another DC power supply system 700 according to some embodiments of the present invention. The DC power supply system 700 includes a DC power supply array 710, a decoupling system 730, and a converter 750.

[0065] The DC power supply array 710 includes multiple DC power supply devices 712A to 712I, wherein DC power supply devices 712A to 712C are connected in series to form a first DC power supply device string, DC power supply devices 712D to 712F are connected in series to form a second DC power supply device string, and DC power supply devices 712G to 712I are connected in series to form a third DC power supply device string. The aforementioned first, second, and third DC power supply device strings are connected in parallel.

[0066] The decoupling system 730 includes multiple switching devices 732A to 732I. The switching devices 732A to 732I have a one-to-one correspondence with the DC power supply devices 712A to 712I, that is, the DC power supply device 712A is connected to the switching device 732A, the DC power supply device 712B is connected to the switching device 732B, and so on.

[0067] In the embodiment shown in Figure 7, switching devices 732A, 732D, and 732G are main switching devices, while the remaining switching devices (including switching devices 732B to 732C, 732E to 732F, and 732H to 732I) are auxiliary switching devices.

[0068] The main switching devices 732A, 732D, and 732G in Figure 7 are wired to external device 97 and receive external signals from external device 97. Main switching device 732A is connected to auxiliary switching devices 732B and 732C via power lines, communication lines, or wireless communication, and transmits control signals (e.g., PLC signals) via power lines, communication lines, or wireless communication. Main switching device 732D is connected to auxiliary switching devices 732E and 732F via power lines, communication lines, or wireless communication, and transmits control signals (e.g., PLC signals) via power lines, communication lines, or wireless communication. Main switching device 732G is connected to auxiliary switching devices 732H and 732I via power lines, communication lines, or wireless communication, and transmits control signals (e.g., PLC signals) via power lines, communication lines, or wireless communication.

[0069] The operation of the main switching devices 732A, 732D, and 732G is similar to that of the main switching device 132A in Figure 1 or the main switching device 232A in Figure 2, while the operation of the auxiliary switching devices 732B to 732C, 732E to 732F, and 732H to 732I is similar to that of the auxiliary switching devices 132B and 132C in Figure 1 or the auxiliary switching devices 232B and 232C in Figure 2.

[0070] Please refer to Figure 8. Figure 8 is a schematic diagram of another DC power supply system 800 according to some embodiments of the present invention. The DC power supply system 800 includes a DC power supply array 810, a decoupling system 830, and a converter 850.

[0071] The DC power supply array 810 includes multiple DC power supply devices 812A to 812I. DC power supply devices 812A to 812C are connected in series to form a first DC power supply device string; DC power supply devices 812D to 812F are connected in series to form a second DC power supply device string; and DC power supply devices 812G to 812I are connected in series to form a third DC power supply device string. The aforementioned first, second, and third DC power supply device strings are connected in parallel.

[0072] The decoupling system 830 includes multiple switching devices 832A to 832I. The switching devices 832A to 832I have a one-to-one correspondence with the DC power supply devices 812A to 812I, that is, the DC power supply device 812A is connected to the switching device 832A, the DC power supply device 812B is connected to the switching device 832B, and so on.

[0073] In the embodiment shown in Figure 8, switching devices 832A, 832D, and 832G are main switching devices, while the remaining switching devices (including switching devices 832B to 832C, 832E to 832F, and 832H to 832I) are auxiliary switching devices.

[0074] In Figure 8, main switch device 832A is wired to external device 981, main switch device 832D is wired to external device 982, and main switch device 832G is wired to external device 983. Main switch devices 832A, 832D, and 832G receive external signals from their corresponding external devices 981 to 983. Main switch devices 832A, 832D, and 832G are connected to auxiliary switch devices 832B to 832C, 832E to 832F, and 832H to 832I via power lines, communication lines, or wireless communication methods, and transmit control signals (e.g., PLC signals) via these methods. The operation of the main switching devices 832A, 832D, and 832G is similar to that of the main switching device 132A in Figure 1 or the main switching device 232A in Figure 2, while the operation of the auxiliary switching devices 832B to 832C, 832E to 832F, and 832H to 832I is similar to that of the auxiliary switching devices 132B and 132C in Figure 1 or the auxiliary switching devices 232B and 232C in Figure 2.

[0075] The embodiments shown in Figures 6 to 8 are also applicable to situations where the DC power supply device and the switching element are connected in parallel. For example, the switching device in Figures 6 to 8 can also be implemented using the switching device in Figures 3 to 5.

[0076] Please refer to Figure 9. Figure 9 is a schematic diagram of another DC power supply system 900 according to some embodiments of the present invention. The DC power supply system 900 includes a DC power supply array 910, a decoupling system 930, and a converter 950.

[0077] The DC power supply array 910 includes multiple DC power supply devices 912A to 912D. DC power supply devices 912A to 912D are connected in series to form a DC power supply device string. DC power supply device 912A is coupled to DC power supply device 912B, DC power supply device 912B is coupled to DC power supply device 912C, and DC power supply device 912C is coupled to DC power supply device 912D.

[0078] The decoupling system 930 includes multiple switching devices 932A to 932B. A DC power supply device 912A is connected to the switching device 932A, and a DC power supply device 912C is connected to the switching device 932B.

[0079] In the embodiment shown in Figure 9, the switching device 932A is the main switching device, while the switching device 932B is the auxiliary switching device.

[0080] The main switch 932A in Figure 9 is wired to the external device 99 and receives external signals from the external device 99. The main switch 932A and the auxiliary switch 932B are connected to each other via power lines, communication lines, or wireless communication, and transmit control signals (e.g., PLC signals) via power lines, communication lines, or wireless communication. The operation of the main switch 932A is similar to that of the main switch 132A in Figure 1 or the main switch 232A in Figure 2, while the operation of the auxiliary switch 932B is similar to that of the auxiliary switches 132B and 132C in Figure 1 or the auxiliary switches 232B and 232C in Figure 2.

[0081] When the switching elements in both the main switchgear 932A and the auxiliary switchgear 932B are not conducting, the DC power supply devices 912A to 912D do not supply power to the converter 950. On the other hand, when the switching elements in both the main switchgear 932A and the auxiliary switchgear 932B are conducting, the DC power supply devices 912A to 912D supply power to the converter 950.

[0082] In some embodiments, when the main switching device 932A transmits a control signal (e.g., a PLC signal) to the auxiliary switching device 932B, the control signal (e.g., the PLC signal) is then transmitted to the auxiliary switching device 932B via the DC power supply device 912B.

[0083] The implementation shown in Figure 9 is only applicable to the case where the DC power supply device and the switching element are connected in series. For example, the switching device in Figures 6 to 8 can also be implemented using the switching device in Figure 3.

[0084] In some embodiments, the switching elements in Figures 1, 2, and 4 may be switches, insulated gate transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), or controllable circuit breakers, etc.

[0085] In some embodiments, the switching elements in Figures 3 and 5 may be insulated gate transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), etc.

[0086] In some embodiments, specifically in the implementation of this case, the external device and the main switch device can be connected via RS485 communication or CAN communication.

[0087] In some embodiments, the DC power supply device described above may be a DC power photovoltaic module, a DC power photovoltaic panel, a DC power solar panel, or other circuits or components with the same or similar functions.

[0088] In some embodiments, the switching device described above may be a circuit or element having a fast-closing element and communication capability, or other circuits or elements having the same or similar functions.

[0089] In some embodiments, the DC power supply device described above can be an energy storage battery or a solar power supply device, used to supply power to household appliances or any power-consuming device. It should be noted that the embodiments shown in Figures 4 and 5 of this invention can only be implemented using a solar power supply device, and cannot be implemented using an energy storage battery.

[0090] In some embodiments, the DC power supply system 100 in FIG. 1 and the DC power supply system 200 in FIG. 2 also include a current-voltage curve (IV curve) diagnostic function, which can identify whether the DC power supply device has problems such as shielding, damage, hot spots, and power supply efficiency. Anomaly diagnosis can be performed on the DC power supply device, including abnormal conditions such as low power supply efficiency and arcing (ARC). In some embodiments, the DC power supply system 100 in FIG. 1 and the DC power supply system 200 in FIG. 2 also include a ground impedance detection function.

[0091] In some embodiments, the switching devices in Figures 1 to 9 can transmit control signals (e.g., PLC signals) to each other via power lines, communication lines, or wireless communication. The DC power supply system 100 in Figure 1 will be used as an example. For instance, when an arc occurs in the DC power supply device 112A, if a component (e.g., a switching element) in the switching device 132A fails or short-circuits, but the communication circuit CA1 of the switching device 132A still operates normally, the communication circuit CA1 of the switching device 132A transmits a signal to the switching devices 132B and 132C via power lines, communication lines, or wireless communication. After receiving the signal, the switching element SB1 in the switching device 132B and the switching element SC1 in the switching device 132C are deactivated. This reduces the system voltage output to the converter 150.

[0092] Furthermore, in some embodiments, switching devices 132A to 132C can also transmit messages to external device 91 via power lines, communication lines, or wireless communication methods and physical lines connected to external device 91 to transmit data (e.g., current and voltage curves). External device 91 can analyze and learn from the data transmitted by switching devices 132A to 132C, and send the results of the analysis and learning back to switching devices 132A to 132C so that the switching devices can operate according to the instructions after analysis and learning.

[0093] In summary, the embodiments disclosed herein provide a decoupling system and a DC power supply system. The switching devices are divided into a main switching device and a secondary switching device. The main switching device can be wired or wirelessly connected to the external device. When a wired connection is used, external messages transmitted by the external device can be received more quickly, and there is less packet loss compared to wireless transmission. Furthermore, the transmission of control signals to the secondary switching device can utilize existing power lines, communication lines, or wireless communication methods within the decoupling system and DC power supply system. When transmitting control signals via power lines, the existing power lines supplying power to the DC power supply device within the DC power supply system are used, eliminating the need for additional communication lines.

[0094] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of this art, the content of this disclosure, and the specific content thereof. Certain terms used to describe this disclosure will be discussed elsewhere in this specification to provide additional guidance to those skilled in the art in describing this disclosure.

[0095] While specific embodiments of the present disclosure have been disclosed in relation to the above embodiments, these embodiments are not intended to limit the present disclosure. Various alternatives and modifications can be made by those skilled in the art without departing from the principles and spirit of the present disclosure. Therefore, the scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A decoupling system, characterized in that, A decoupling system is coupled between a DC power supply array and a converter, wherein the DC power supply array includes a first DC power supply device and a second DC power supply device, wherein the decoupling system includes: a main switch device coupled to the first DC power supply device and configured to receive an external signal from an external device, control a main switch element of the main switch device according to the external signal, and transmit a control signal according to the external signal; and a sub switch device coupled to the second DC power supply device, receive the control signal from the main switch device, and control a sub switch element of the sub switch device according to the control signal; wherein the main switch element and the sub switch element control a system voltage value outputted from the DC power supply array to the converter.

2. The decoupling system of claim 1, wherein, The main switch element is connected in series with the first DC power supply device, and the sub switch element is connected in series with the second DC power supply device, wherein the main switch device includes: a main communication circuit configured to receive the external signal; and a main processing circuit coupled to the main communication circuit, wherein when the external signal includes an abnormal signal, the main processing circuit turns off the main switch element so that the first DC power supply device does not supply power to the converter, and wherein when the external signal includes a normal signal, the main processing circuit turns on the main switch element so that the first DC power supply device supplies power to the converter; wherein the sub switch device includes: a sub communication circuit coupled to the main communication circuit and configured to receive the control signal from the main communication circuit; and a sub processing circuit coupled to the sub communication circuit, wherein when the control signal includes the abnormal signal, the sub processing circuit turns off the sub switch element so that the second DC power supply device does not supply power to the converter, and wherein when the external signal includes the normal signal, the sub processing circuit turns on the sub switch element so that the second DC power supply device supplies power to the converter.

3. The decoupling system of claim 1, wherein, The main switch element is connected in parallel with the first DC power supply device, and the sub switch element is connected in parallel with the second DC power supply device, wherein the main switch device includes: a main communication circuit configured to receive the external signal; and a main processing circuit coupled to the main communication circuit, wherein when the external signal includes an abnormal signal, the main processing circuit turns on the main switch element so that the first DC power supply device does not supply power to the converter, and wherein when the external signal includes a normal signal, the main processing circuit turns off the main switch element so that the first DC power supply device does not supply power to the converter; wherein the sub switch device includes: a sub communication circuit coupled to the main communication circuit and configured to receive the control signal from the main communication circuit; and a sub processing circuit coupled to the sub communication circuit, wherein when the control signal includes the abnormal signal, the sub processing circuit turns on the sub switch element so that the second DC power supply device does not supply power to the converter, and wherein when the external signal includes the normal signal, the sub processing circuit turns off the sub switch element so that the second DC power supply device does not supply power to the converter. A secondary processing circuit is coupled to the secondary communication circuit. When the control signal contains the abnormal signal, the secondary processing circuit turns on the secondary switching element so that the second DC power supply device does not supply power to the converter device. When the external signal contains the normal signal, the secondary processing circuit does not turn on the secondary switching element so that the second DC power supply device supplies power to the converter device.

4. The decoupling system according to claim 2 or 3, characterized in that The main communication circuit is further used to receive a first notification signal, and the main processing circuit is further used to determine the main switching device as a master device based on the first notification signal. The main processing circuit is further used to generate a second notification signal based on the first notification signal and transmit the second notification signal to the secondary switching device via the main communication circuit. The secondary communication circuit is further used to receive the second notification signal, and the secondary processing circuit is further used to determine the secondary processing circuit as a slave device based on the second notification signal.

5. The decoupling system of claim 1, wherein, The external device includes an external switching element, wherein the main switching device includes: A main voltage detection circuit is used to generate a first voltage or a second voltage based on a conduction state of the external switching element; and A main processing circuit, coupled to the main voltage detection circuit, is used to control the main switching element based on the first voltage and the second voltage.

6. The decoupling system of claim 5, wherein, The main switching element is connected in series with the first DC power supply device, wherein the main processing circuit is further used for: When the first voltage is received, the main switching element is not turned on so that the first DC power supply device does not supply power to the converter device. The main processing circuit is further configured to turn on the main switching element when the second voltage is received so that the first DC power supply device supplies power to the converter device. The main processing circuit is further configured to generate a control signal containing an abnormal signal when the first voltage is received, and to generate a control signal containing a normal signal when the second voltage is received. The main switch device also includes: A main communication circuit, coupled to the main processing circuit, is used to transmit the control signal.

7. The decoupling system of claim 6, wherein, The auxiliary switching element is connected in series with the second DC power supply device, wherein the auxiliary switching device includes: A communication circuit, coupled to the main communication circuit, is used to receive the control signal from the main communication circuit; and A secondary processing circuit is coupled to the secondary communication circuit. When the control signal contains the abnormal signal, the secondary processing circuit does not turn on the secondary switching element so that the second DC power supply device does not supply power to the converter device. When the external signal contains the normal signal, the secondary processing circuit turns on the secondary switching element so that the second DC power supply device supplies power to the converter device.

8. The decoupling system of claim 5, wherein, The main switching element is connected in parallel with the first DC power supply device, wherein the main processing circuit is further used for: The main processing circuit is further used to turn on the main switch element when the first voltage is received, so that the first DC power supply device does not supply power to the conversion device, wherein the main processing circuit is further used to turn off the main switch element when the second voltage is received, so that the first DC power supply device supplies power to the conversion device, wherein the main processing circuit is further used to generate the control signal containing an abnormal signal when the first voltage is received, and is used to generate the control signal containing a normal signal when the second voltage is received. The main switch device further comprises: A main communication circuit coupled to the main processing circuit for transmitting the control signal.

9. The decoupling system of claim 8, wherein, The auxiliary switch element is connected in parallel with the second DC power supply device, wherein the auxiliary switch device comprises: An auxiliary communication circuit coupled to the main communication circuit for receiving the control signal from the main communication circuit; and An auxiliary processing circuit coupled to the auxiliary communication circuit, wherein the auxiliary processing circuit turns on the auxiliary switch element when the control signal contains the abnormal signal, so that the second DC power supply device does not supply power to the conversion device, wherein the auxiliary processing circuit turns off the auxiliary switch element when the control signal contains the normal signal, so that the second DC power supply device supplies power to the conversion device. The main processing circuit is further used to determine that the main switch device is a master device when the main voltage detection circuit detects a cross voltage, and the main processing circuit is further used to generate a notification signal and transmit the notification signal to the auxiliary switch device through a main communication circuit of the main switch device, wherein the auxiliary communication circuit is further used to receive the notification signal, and the auxiliary processing circuit is further used to determine that the auxiliary switch device is a slave device according to the notification signal.

10. The decoupling system of claim 5, wherein, Comprise:

11. A direct current power supply system, characterized by comprising: A DC power supply array comprising a first DC power supply device and a second DC power supply device; A plurality of switch devices comprising: A first main switch device coupled to the first DC power supply device for receiving a first external signal from a first external device, controlling a first main switch element of the first main switch device according to the first external signal, and transmitting a control signal after generating the control signal according to the first external signal; And A first auxiliary switch device coupled to the second DC power supply device, receiving the control signal from the first main switch device, and controlling a first auxiliary switch element of the first auxiliary switch device according to the control signal; And A conversion device coupled to the switch devices, wherein the first main switch element and the first auxiliary switch element control a system voltage value output from the DC power supply array to the conversion device. The first DC power supply device and the second DC power supply device are connected in parallel.

12. The direct current power supply system of claim 11, wherein, The DC power supply array further comprises a third DC power supply device, wherein the switch devices further comprise:

13. The direct current power supply system of claim 12, wherein, A second auxiliary switch device coupled to the third DC power supply device, receiving the control signal from the first main switch device, and controlling a second auxiliary switch element of the second auxiliary switch device according to the control signal; Wherein the third DC power supply device and the first DC power supply device are connected in series. ​ 14. The direct current power supply system of claim 11, wherein, The first DC power supply device and the second DC power supply device are connected in series to the converter.

15. The direct current power supply system of claim 14, wherein, The DC power supply array further comprises a third DC power supply device, wherein the switch devices further comprise: a second main switch device coupled to the third DC power supply device and wired to a second external device, wherein the second main switch device is configured to receive a second external signal from the second external device and control a second main switch element of the second main switch device according to the second external signal; wherein the third DC power supply device is connected in parallel to the first DC power supply device.

16. The direct current power supply system of claim 14, wherein, The DC power supply array further comprises a third DC power supply device, wherein the switch devices further comprise: a second main switch device coupled to the third DC power supply device and wired to a second external device, wherein the second main switch device is configured to receive a second external signal from the second external device and control a second main switch element of the second main switch device according to the second external signal; wherein the third DC power supply device is connected in parallel to the first DC power supply device.

17. The direct current power supply system of claim 12 or 14, wherein, The first main switch element is connected in series to the first DC power supply device, and the first auxiliary switch element is connected in series to the second DC power supply device.

18. The direct current power supply system of claim 12 or 14, wherein, The first main switch element is connected in parallel to the first DC power supply device, and the first auxiliary switch element is connected in parallel to the second DC power supply device.

19. The direct current power supply system of claim 17, wherein, The DC power supply array further comprises: a third DC power supply device coupled between the first main switch device and the first auxiliary switch device, wherein the first DC power supply device, the second DC power supply device, and the third DC power supply device are connected in series to each other.

20. The direct current power supply system of claim 19, wherein, The first main switch element is connected in series to the first DC power supply device, and the first auxiliary switch element is connected in series to the second DC power supply device.

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