Switching control circuit, switching control method and power distribution cabinet

Abstract

The invention discloses a switching control circuit, a switching control method and a power distribution cabinet, and relates to the technical field of electronic power, and the switching control circuit is characterized in that when a power grid supplies power, a control unit sends out a power grid power supply signal and a power generation equipment disconnection signal; the power generation equipment control module controls power generation equipment to stop supplying power according to the grid power supply signal and the power generation equipment disconnection signal; the power grid control module delays the power grid power supply signal and controls the power grid to start power supply according to the delayed power grid power supply signal; when the power generation equipment supplies power, the control unit sends a power grid disconnection signal and a power generation equipment power supply signal; the power grid control module controls the power grid to stop power supply according to the power grid disconnection signal and the power generation equipment power supply signal; and the power generation equipment control module delays the power generation equipment power supply signal and controls the power generation equipment to start power supply according to the delayed power generation equipment power supply signal. According to the invention, the problems of complicated operation and incapability of realizing seamless switching during power supply switching in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of electronic power technology, and in particular to a switching control circuit, a switching control method, and a power distribution cabinet. Background Technology

[0002] With the popularization of photovoltaic power generation and the development of energy storage technology, residential energy storage products are becoming increasingly popular among consumers. Residential power sources are also becoming more diversified, including the power grid, photovoltaic power generation equipment, batteries, and generators. Therefore, to avoid inconvenience or economic losses for users, these energy sources need to be rationally allocated to ensure uninterrupted power supply.

[0003] Currently, distribution cabinets can act as energy routers, controlling the supply of power to users when there is power at any end, such as the power grid, photovoltaic power generation equipment, batteries, or generators. However, existing distribution cabinets typically rely on manual control circuits when there is no power from the grid and it is necessary to switch to other power supply equipment to provide power to users, or when power needs to be switched back to grid power after the grid is restored. This switching control method is complex to operate and cannot achieve seamless switching. Summary of the Invention

[0004] This invention provides a switching control circuit to solve the problems of complex operation and inability to achieve seamless switching in existing technologies that rely on manual control of switching circuits. The switching control circuit includes: a control unit, a power grid control module, and at least one power generation equipment control module; each power generation equipment control module is used to control one power generation device. When the grid supplies power: the control unit is used to send a grid supply signal and at least one generator disconnection signal; at least one generator control module is used to control the generator to stop supplying power according to the grid supply signal and the generator disconnection signal; the grid control module is used to delay the grid supply signal and control the grid to start supplying power according to the delayed grid supply signal. When the power generation equipment supplies power: the control unit is used to issue a power grid disconnection signal and at least one power generation equipment supply signal; the power grid control module is used to control the power grid to stop supplying power according to the power grid disconnection signal and at least one power generation equipment supply signal; at least one power generation equipment control module is used to delay the power generation equipment supply signal and control the power generation equipment to start supplying power according to the delayed power generation equipment supply signal.

[0005] Preferably, the power grid control module includes a first delay unit, a power grid driver chip, a first switching transistor, a power grid relay, a first OR gate, a second OR gate, and a second switching transistor; the power grid relay includes a power grid on coil and a power grid off coil. The input of the first delay unit is connected to the power grid supply signal output of the control unit; the first input of the first OR gate is connected to the power grid disconnection signal output of the control unit, and the second input of the first OR gate is connected to the output of the second OR gate; each input of the second OR gate is connected to the power supply signal output of a generator in the control unit; the input of the power grid driver chip is connected to the output of the first OR gate and the output of the first delay unit respectively; the output of the power grid driver chip is connected to the control terminal of the first switch and the control terminal of the second switch respectively; the first terminal of the first switch is grounded, and the second terminal of the first switch is connected to the power grid conduction coil; the first terminal of the second switch is grounded, and the second terminal of the second switch is connected to the power grid disconnection coil.

[0006] Preferably, each of the power generation equipment control modules includes a second delay unit, a power generation drive chip, a third switch, a power generation equipment relay, a third OR gate, and a fourth switch; the power generation equipment relay includes a power generation on coil and a power generation off coil; The second delay unit's input is connected to the power supply signal output of the control unit's generator; the first input of the third OR gate is connected to the grid power supply signal output of the control unit, and the second input of the third OR gate is connected to a generator disconnection signal output of the control unit; the input of the generator driver chip is connected to the output of the third OR gate and the output of the second delay unit, respectively, and the output of the generator driver chip is connected to the control terminals of the third and fourth switches, respectively; the first terminal of the third switch is grounded, and the second terminal of the third switch is connected to the generator's conduction coil; the first terminal of the fourth switch is grounded, and the second terminal of the fourth switch is connected to the generator's disconnection coil.

[0007] Preferably, when the power grid is supplying power, each of the power generation equipment control modules is configured to: the third OR gate outputs a first control signal based on the power grid supply signal and the power generation equipment disconnection signal; the power generation drive chip generates a first drive signal based on the first control signal and outputs it to the fourth switch; the fourth switch is turned on in response to the first drive signal and transmits the first drive signal to the power generation equipment disconnection coil; the power generation equipment disconnection coil is turned on in response to the first drive signal, causing the power generation equipment to stop supplying power. The power grid control module is specifically configured to: delay the power grid supply signal by the first delay unit; generate a second drive signal based on the delayed power grid supply signal and output it to the first switch; transmit the second drive signal to the power grid conduction coil in response to the second drive signal; and enable the power grid to start supplying power in response to the second drive signal.

[0008] Preferably, when the power generation equipment is supplying power, the power grid control module is specifically configured to: the second OR gate outputs a second control signal based on the power supply signal of at least one power generation equipment; the first OR gate outputs a third control signal based on the second control signal and the power grid disconnection signal; the power grid drive chip generates a third drive signal based on the third control signal and outputs it to the second switching transistor; the second switching transistor turns on in response to the third drive signal and transmits the third drive signal to the power grid disconnection coil; the power grid disconnection coil turns on in response to the third drive signal, causing the power grid to stop supplying power. Each of the aforementioned power generation equipment control modules is specifically configured to: delay the power supply signal of the power generation equipment by the second delay unit; generate a fourth drive signal based on the delayed power supply signal of the power generation equipment and output it to the third switch; the third switch is turned on in response to the fourth drive signal and transmits the fourth drive signal to the power generation equipment conduction coil; the power generation equipment conduction coil is turned on in response to the fourth drive signal, causing the power generation equipment to start supplying power.

[0009] Preferably, the power grid control module further includes a first slave relay and a fifth switch; the first end of the fifth switch is connected to the control signal output terminal of the first slave relay of the control unit, the second end of the fifth switch is connected to the first end of the coil of the first slave relay, and the third end of the fifth switch is grounded; the second end of the coil of the first slave relay is connected to a first DC voltage source; the two ends of the contacts of the first slave relay are respectively connected to the second end of the first switch and the power grid conduction coil. When the grid is supplying power, the control unit is also used to: issue a first slave relay control signal; The power grid control module is further configured to: the fifth switch, in response to the first slave relay control signal being turned on, transmit the first slave relay control signal to the first slave relay; the first slave relay, in response to the first slave relay control signal being turned on, transmit the second drive signal to the power grid conduction coil after the first switch is turned on; the power grid conduction coil, in response to the second drive signal being turned on, causes the power grid to start supplying power.

[0010] Preferably, each of the power generation equipment control modules further includes a second slave relay and a sixth switch; the first end of the sixth switch is connected to the control signal output terminal of the second slave relay of the control unit, the second end of the sixth switch is connected to the first end of the coil of the second slave relay, and the third end of the sixth switch is grounded; the second end of the coil of the second slave relay is connected to a second DC voltage source; the two ends of the contacts of the second slave relay are respectively connected to the second end of the third switch and the power generation equipment conduction coil. When the power generation equipment supplies power, the control unit is also used to: issue at least one second slave relay control signal; Each of the power generation equipment control modules is further configured to: the sixth switch, in response to the second slave relay control signal being turned on, transmit the second slave relay control signal to the second slave relay; the second slave relay, in response to the second slave relay control signal being turned on, transmit the fourth drive signal to the power generation equipment conduction coil after the third switch is turned on; the power generation equipment conduction coil, in response to the fourth drive signal being turned on, causes the power generation equipment to start supplying power.

[0011] Preferably, the power grid control module further includes a third slave relay; the two ends of the coil of the third slave relay are respectively connected to the two ends of the first AC power supply; the two ends of the contacts of the third slave relay are respectively connected to the contacts of the first slave relay and the power grid conduction coil.

[0012] Preferably, each of the power generation equipment control modules further includes a fourth slave relay; the two ends of the coil of the fourth slave relay are respectively connected to the two ends of the second AC power supply; the two ends of the contacts of the fourth slave relay are respectively connected to the contacts of the second slave relay and the power generation equipment conduction coil.

[0013] Preferably, the power grid control module further includes a first AND gate, the input of which is connected to the output of the first delay unit, and the output of which is connected to the input of the power grid driver chip; The first AND gate is used to enhance the delayed power grid supply signal.

[0014] Preferably, each of the power generation equipment control modules further includes a second AND gate, the input of which is connected to the output of the second delay unit, and the output of which is connected to the input of the power generation driver chip; The second AND gate is used to enhance the power supply signal of the power generation equipment after the delay.

[0015] Preferably, the switching control circuit further includes a failure protection module, which includes a third AND gate and a fourth OR gate; The input of the fourth OR gate is connected to at least one power supply signal output of the control unit; the output of the fourth OR gate is connected to the second input of the third AND gate; the first input of the third AND gate is connected to the power grid power supply signal output of the control unit; and the output of the third AND gate is connected to the input of the power generation driver chip and the input of the power grid driver chip. The failure protection module is used to output a fourth control signal when it receives a power supply signal from at least one power generation device and a power supply signal from the grid; the fourth control signal is used to put the power generation drive chip and the grid drive chip into a low-level mode.

[0016] Preferably, the switching control circuit further includes a failure protection module, which includes a fourth AND gate, a fifth AND gate, a sixth AND gate, and a fifth OR gate; The first input terminal of the fourth AND gate is connected to the mains power supply signal output terminal of the control unit, and the second input terminal of the fourth AND gate is connected to the first slave relay control signal output terminal of the control unit. The input of the fifth OR gate is connected to the power supply signal output of at least one power generation device of the control unit; The first input terminal of the fifth AND gate is connected to the second slave relay control signal output terminal of the control unit, and the second input terminal is connected to the output terminal of the fifth OR gate. The first input of the sixth AND gate is connected to the output of the fourth AND gate, and the second input of the sixth AND gate is connected to the output of the fifth OR gate; the output of the sixth AND gate is connected to the input of the power generation driver chip and the input of the power grid driver chip. The failure protection module is used to output a fifth control signal when it receives at least one power supply signal from a power generation device, a power grid signal, a first slave relay control signal, and a second slave relay control signal; the fifth control signal is used to put the power generation drive chip and the power grid drive chip into a low-level mode.

[0017] This invention also provides a switching control method applied to the aforementioned switching control circuit; to solve the problem that manual control of the switching circuit in the prior art is complex and cannot achieve seamless switching; the switching control method includes: When the grid supplies power: a grid supply signal and a disconnection signal for at least one power generation device are issued; the power generation device is controlled to stop supplying power based on the grid supply signal and the disconnection signal; the grid supply signal is delayed, and the grid is controlled to start supplying power based on the delayed grid supply signal; When the power generation equipment is supplying power: a grid disconnection signal and at least one power generation equipment power supply signal are issued; the grid is controlled to stop supplying power according to the grid disconnection signal and at least one power generation equipment power supply signal; the power generation equipment power supply signal of at least one power generation equipment is delayed, and the power generation equipment is controlled to start supplying power according to the delayed power generation equipment power supply signal.

[0018] This invention also provides a power distribution cabinet, which includes the aforementioned switching control circuit.

[0019] The switching control circuit provided in this embodiment of the invention includes: a control unit, a power grid control module, and at least one power generation equipment control module; each power generation equipment control module is used to control one power generation equipment; when the power grid is supplying power: the control unit is used to issue a power grid supply signal and at least one power generation equipment disconnection signal; at least one power generation equipment control module is used to control the power generation equipment to stop supplying power according to the power grid supply signal and the power generation equipment disconnection signal; the power grid control module is used to delay the power grid supply signal and control the power grid to start supplying power according to the delayed power grid supply signal; when the power generation equipment is supplying power: the control unit is used to issue a power grid disconnection signal and at least one power generation equipment supply signal; the power grid control module is used to control the power grid to stop supplying power according to the power grid disconnection signal and at least one power generation equipment supply signal; at least one power generation equipment control module is used to delay the power generation equipment supply signal and control the power generation equipment to start supplying power according to the delayed power generation equipment supply signal. Compared with the prior art, the embodiments of the present invention send a power grid supply signal and a power generation equipment disconnection signal or a power grid disconnection signal and a power generation equipment supply signal through the control unit. The power grid control module and at least one power generation equipment control module first disconnect the current power supply equipment according to the signal sent by the control unit, and then delay the power supply signal so that the target power supply equipment is turned on after the delay. In this way, it can be ensured that when one side is turned off, the other side can seamlessly connect to supply power. Seamless switching between the power grid and the power generation equipment can be achieved through simple operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] In the attached diagram: Figure 1 This is a structural diagram of a switching control circuit provided in an embodiment of the present invention; Figure 2 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention; Figure 3 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention; Figure 4 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention; Figure 5 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention; Figure 6 This is a structural diagram of a failure protection module provided in an embodiment of the present invention; Figure 7 This is a structural diagram of another failure protection module provided in an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0023] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0024] Research has found that existing distribution cabinets, when the power grid is down and it is necessary to switch to other power supply equipment to provide power to users, or when the power grid is restored and it is necessary to switch from other power supply equipment to power grid supply to users, usually use manual control of the switching circuit. This switching control method is complicated to operate and cannot achieve seamless switching.

[0025] To address the aforementioned issues, embodiments of the present invention provide a switching control circuit that enables seamless switching when the power grid is down or when power is restored.

[0026] Figure 1 This is a structural diagram of a switching control circuit provided in an embodiment of the present invention. Figure 1 As shown, the switching control circuit may include: a control unit 1, a power grid control module 2, and at least one power generation equipment control module 3; each power generation equipment control module 3 is used to control one power generation equipment.

[0027] When the grid supplies power: Control unit 1 can be used to send a grid supply signal and a disconnection signal for at least one generator; at least one generator control module 3 can be used to control the generator to stop supplying power based on the grid supply signal and the generator disconnection signal; Grid control module 2 can be used to delay the grid supply signal and control the grid to start supplying power based on the delayed grid supply signal.

[0028] When the power generation equipment supplies power: Control unit 1 can be used to issue a power grid disconnection signal and at least one power generation equipment supply signal; Power grid control module 2 can be used to control the power grid to stop supplying power according to the power grid disconnection signal and at least one power generation equipment supply signal; At least one power generation equipment control module 3 can be used to delay the power generation equipment supply signal and control the power generation equipment to start supplying power according to the delayed power generation equipment supply signal.

[0029] In this embodiment of the invention, the power grid control module and at least one power generation equipment control module are interlocked, so that the power grid and the power generation equipment cannot supply power at the same time. Moreover, the power supply signal of the power generation equipment and the power supply signal of the power grid are issued with a delay in each power generation equipment control module and the power grid control module, so as to ensure that when one is turned off, the other can seamlessly connect to supply power, thereby realizing seamless switching between the power grid and the power generation equipment.

[0030] Figure 2 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention. (See diagram below.) Figure 2 As shown, the above-mentioned power grid control module 2 may include a first delay unit S1, a power grid drive chip D1, a first switch Q1, a power grid relay J1, a first OR gate OR1, a second OR gate OR2, and a second switch Q2. The power grid relay J1 may include a power grid on coil J11 and a power grid off coil J12.

[0031] The input of the first delay unit S1 is connected to the power grid supply signal output of the control unit 1; the first input of the first OR gate OR1 is connected to the power grid disconnection signal output of the control unit 1; the second input of the first OR gate OR1 is connected to the output of the second OR gate OR2; each input of the second OR gate OR2 is connected to a power generation device power supply signal output of the control unit 1, i.e., each input of the second OR gate OR2 is connected to a power generation device power supply signal output; the input of the power grid driver chip D1 is connected to the output of the first OR gate OR1 and the output of the first delay unit S1; the output of the power grid driver chip D1 is connected to the control terminal of the first switch Q1 and the control terminal of the second switch Q2; the first terminal of the first switch Q1 is grounded, and the second terminal of the first switch Q1 is connected to the power grid conduction coil J11; the first terminal of the second switch Q2 is grounded, and the second terminal of the second switch Q2 is connected to the power grid disconnection coil J12.

[0032] Figure 2It contains two power generation equipment control modules 3, each connected to one power generation device (L1 and L2) for controlling the opening and closing of the connected power generation devices (L1 and L2). Each power generation equipment control module 3 may include a second delay unit S2, a power generation driver chip D2, a third switch Q3, a power generation equipment relay J2, a third OR gate OR3, and a fourth switch Q4; the power generation equipment relay J2 includes a power generation on coil J21 and a power generation off coil J22.

[0033] The second delay unit S2 is connected to the power supply signal output of the generator set of the control unit 1; the first input of the third OR gate OR3 is connected to the power grid power supply signal output of the control unit 1; the second input of the third OR gate OR3 is connected to the disconnection signal output of one of the generator sets of the control unit 1, which is the output of the disconnection signal of the generator set controlled by the generator set control module; the input of the generator drive chip D2 is connected to the output of the third OR gate OR3 and the output of the second delay unit S2 respectively, and the output of the generator drive chip D2 is connected to the control terminal of the third switch Q3 and the control terminal of the fourth switch Q4 respectively; the first terminal of the third switch Q3 is grounded, and the second terminal of the third switch Q3 is connected to the generator set conduction coil J21; the first terminal of the fourth switch Q4 is grounded, and the second terminal of the fourth switch Q4 is connected to the generator set disconnection coil J22.

[0034] In practice, the aforementioned power grid relay J1 and generator equipment relay J2 are controlled by dual coils. The signals for controlling the opening and closing are separate and do not affect each other. If the same relay receives both the opening and closing signals at the same time, the relay contacts will not operate.

[0035] In specific implementation, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 can be semiconductor switches, such as MOSFETs. The first delay unit S1 and the second delay unit S2 can be implemented using resistors and capacitors.

[0036] based on Figure 2 The switching control circuit in the control unit 1 outputs a grid-ON signal when the grid is supplying power. For each generator, its corresponding generator disconnection signal output terminal outputs a generator disconnection signal: L1-OFF for disconnecting generator L1 and L2-OFF for disconnecting generator L2. The switching control circuit's switching control workflow is as follows: Each power generation equipment control module 3 can be specifically used for: the third OR gate OR3 outputs a first control signal based on the grid power supply signal Grid-ON and the power generation equipment disconnection signal L1-OFF (or L2-OFF); the power generation drive chip D2 generates a first drive signal based on the first control signal and outputs it to the fourth switch Q4; the fourth switch Q4 responds to the first drive signal and conducts to transmit the first drive signal to the power generation equipment disconnection coil J22; the power generation equipment disconnection coil J22 responds to the first drive signal and conducts to stop the power supply of power generation equipment L1 (or L2); The power grid control module 2 can be specifically used for: the first delay unit S1 to delay the power grid supply signal Grid-ON; the power grid drive chip D1 to generate a second drive signal based on the delayed power grid supply signal Grid-ON, and output it to the first switch Q1; the first switch Q1 responds to the second drive signal and conducts the second drive signal to the power grid conduction coil J11; the power grid conduction coil J11 responds to the second drive signal and conducts, so that the power grid starts supplying power.

[0037] In other words, when the grid supplies power, there are two signal transmission paths: one is the generator disconnect coil used to activate the generator relay, shutting off the generator; the other is the grid activation coil used to activate the grid relay, turning on grid power supply. The grid power supply signal and at least one generator disconnect signal can be sent simultaneously. This is because the grid power supply signal can be delayed by the grid control module's delay unit, ensuring that grid power supply is activated after the generator is shut down, avoiding simultaneous power supply from both. Furthermore, the generator shutdown operation is fast-responding, enabling seamless switching between the grid and the generator.

[0038] based on Figure 2 In the switching control circuit, when the power generation equipment is supplying power, the grid disconnect signal output terminal of control unit 1 outputs a grid disconnect signal Grid-OFF. For each power generation equipment, its corresponding power supply signal output terminal outputs a power supply signal, namely, the signal to turn on power generation equipment L1 (L1-ON) and the signal to turn on power generation equipment L2 (L2-ON). The switching control circuit's switching control process is as follows: The power grid control module 2 can be specifically used for: a second OR gate OR2 outputting a second control signal based on at least one power supply signal L1-ON and L2-ON from a power generation device; a first OR gate OR1 outputting a third control signal based on the second control signal and a power grid disconnection signal Grid-OFF; a power grid driver chip D1 generating a third drive signal based on the third control signal and outputting it to a second switch Q2; the second switch Q2 turning on in response to the third drive signal transmitting the third drive signal to the power grid disconnection coil J12; and the power grid disconnection coil J12 turning on in response to the third drive signal, causing the power grid to stop supplying power. Each power generation equipment control module 3 can be specifically used for: the second delay unit S2 to delay the power supply signal L1-ON (or L2-ON) of the power generation equipment; the power generation drive chip D2 generates a fourth drive signal according to the delayed power supply signal L1-ON (or L2-ON) of the power generation equipment and outputs it to the third switch Q3; the third switch Q3 responds to the fourth drive signal and conducts the fourth drive signal to the power generation equipment conduction coil J21; the power generation equipment conduction coil J21 responds to the fourth drive signal and conducts, so that the power generation equipment L1 (or L2) starts to supply power.

[0039] In other words, when the power generation equipment supplies power, there are two signal transmission paths: one is used to activate the grid disconnect coil of the grid relay, shutting off the grid; the other is used to activate the power generation equipment activation coil of each power generation equipment relay, turning on each power generation equipment. The grid disconnect signal and at least one power generation equipment supply signal can be issued simultaneously, because each power generation equipment supply signal can be delayed by the delay unit of the connected power generation equipment control module. This ensures that the power generation equipment supplies power after the grid is disconnected, avoiding simultaneous power supply from both. Furthermore, the grid shutdown operation is fast-responding, enabling seamless switching between the grid and the power generation equipment.

[0040] Figure 3 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention. (See diagram below.) Figure 3 As shown, in Figure 2 Based on this, the above-mentioned power grid control module 2 may further include a first slave relay C1 and a fifth switch Q5; the first end of the fifth switch Q5 is connected to the first slave relay control signal output terminal of the control unit 1, the second end of the fifth switch Q5 is connected to the first end of the coil of the first slave relay C1, and the third end of the fifth switch Q5 is grounded; the second end of the coil of the first slave relay C1 is connected to a first DC voltage source; the two ends of the contacts of the first slave relay C1 are respectively connected to the second end of the first switch Q1 and the power grid conduction coil J11; When powered by the mains, control unit 1 can also be used to: issue a first slave relay control signal C1-ON; The power grid control module 2 can also be used for: the fifth switch Q5 responding to the first slave relay control signal C1-ON being turned on, transmitting the first slave relay control signal C1-ON to the first slave relay C1; the first slave relay C1 responding to the first slave relay control signal C1-ON being turned on, transmitting the second drive signal to the power grid conducting coil J11 after the first switch Q1 is turned on; the power grid conducting coil J11 responding to the second drive signal being turned on, causing the power grid to start supplying power.

[0041] In specific implementation, based on Figure 3 In the switching control circuit, when the mains power is supplied, the control unit 1 sends a first slave relay control signal C1-ON and a mains power supply signal Grid-ON. After being delayed by the first delay unit S1, the mains power supply signal Grid-ON enters the mains drive chip D1. The mains drive chip D1 generates a second drive signal based on the delayed mains power supply signal Grid-ON and outputs it to the first switch Q1. The first switch Q1 turns on in response to the second drive signal. At the same time, the fifth switch Q5 turns on in response to the first slave relay control signal C1-ON and transmits the first slave relay control signal C1-ON to the first slave relay C1. The first slave relay C1 turns on in response to the first slave relay control signal C1-ON. At this time, the second drive signal can be transmitted to the mains conduction coil J11, controlling the mains conduction coil J11 to turn on, thereby enabling the mains power supply to begin.

[0042] In this way, by controlling the power grid opening together through the first relay control signal and the power grid supply signal, safety problems caused by the failure of a single electronic component can be avoided.

[0043] like Figure 3 As shown, each power generation equipment control module 3 may further include a second slave relay C2 and a sixth switch Q6; the first end of the sixth switch Q6 is connected to the second slave relay control signal output terminal of the control unit 1, the second end of the sixth switch Q6 is connected to the first end of the coil of the second slave relay C2, and the third end of the sixth switch Q6 is grounded; the second end of the coil of the second slave relay C2 is connected to a second DC voltage source; the two ends of the contacts of the second slave relay C2 are respectively connected to the second end of the third switch Q3 and the power generation equipment conduction coil L21; When the power generation equipment is supplying power, the control unit can also be used to: issue at least one second slave relay control signal C2-ON; Each power generation equipment control module 3 can also be used for: the sixth switch Q6 responding to the second slave relay control signal C2-ON being turned on, transmitting the second slave relay control signal C2-ON to the second slave relay C2; the second slave relay C2 responding to the second slave relay control signal C2-ON being turned on, transmitting the fourth drive signal to the power generation equipment conduction coil L21 after the third switch Q3 is turned on; the power generation equipment conduction coil L21 responding to the fourth drive signal being turned on, causing the power generation equipment to start supplying power.

[0044] In specific implementation, based on Figure 3 In the switching control circuit, when the power generation equipment supplies power, the control unit 1 can issue a second slave relay control signal C2-ON and a power supply signal L1-ON (or L2-ON) for each power generation equipment. After being delayed by the second delay unit S2, the power supply signal L1-ON (or L2-ON) enters the power generation driver chip D2. The power generation driver chip D2 generates a fourth drive signal based on the delayed power supply signal L1-ON (or L2-ON) and outputs it to the third switch Q3. The third switch Q3 turns on in response to the fourth drive signal. At the same time, the sixth switch Q6 turns on in response to the second slave relay control signal C2-ON and transmits the second slave relay control signal C2-ON to the second slave relay C2. The second slave relay C2 turns on in response to the second slave relay control signal C2-ON. At this time, the fourth drive signal can be transmitted to the power generation equipment conduction coil J21, controlling the power generation equipment conduction coil J21 to turn on, thereby enabling the power generation equipment to start supplying power.

[0045] In this way, by controlling the power generation equipment to turn on through the second relay control signal and the power supply signal of the power generation equipment, safety problems caused by the failure of a single electronic component can be avoided.

[0046] In practice, the fifth switch Q5 and the sixth switch Q6 can be transistors or semiconductor switches, etc.

[0047] Figure 4 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention. (See diagram below.) Figure 4 As shown, the above-mentioned power grid control module 2 may also include a third slave relay C3; the two ends of the coil of the third slave relay C3 are respectively connected to the two ends of the first AC power supply; the two ends of the contacts of the third slave relay C3 are respectively connected to the contacts of the first slave relay C1 and the power grid conduction coil J11.

[0048] like Figure 4As shown, each power generation equipment control module 3 may also include a fourth slave relay C4; the two ends of the coil of the fourth slave relay C4 are respectively connected to the two ends of the second AC power supply; the two ends of the contacts of the fourth slave relay C4 are respectively connected to the contacts of the second slave relay C2 and the power generation equipment conduction coil J21.

[0049] In specific implementation, based on Figure 4 In the switching control circuit, the third slave relay C3 and the fourth slave relay C4 are AC-driven relays. When the mains power is supplied, after the first slave relay C1 and the first switching transistor Q1 are turned on, if there is AC power in the coil, the third slave relay C3 opens to transmit the second drive signal to the mains-connected coil J11. When the generator supplies power, after the second slave relay C2 and the third switching transistor Q3 are turned on, if there is AC power in the coil, the fourth slave relay C4 opens to transmit the fourth drive signal to the generator-connected coil J21.

[0050] In this way, the interlocking of the hardware itself can be achieved through the third slave relay C3 and the fourth slave relay C4, further ensuring the safety of the circuit.

[0051] Figure 5 This is a structural diagram of another switching control circuit provided in an embodiment of the present invention. (See diagram below.) Figure 5 As shown, the above-mentioned power grid control module 2 may further include a first AND gate AND1, the input of the first AND gate AND1 is connected to the output of the first delay unit S1, and the output of the first AND gate AND1 is connected to the input of the power grid driver chip D1. The first AND gate, AND1, is used to enhance the delayed mains power supply signal.

[0052] like Figure 5 As shown, each power generation equipment control module 3 may also include a second AND gate AND2, the input of the second AND gate AND2 is connected to the output of the second delay unit S2, and the output of the second AND gate AND2 is connected to the input of the power generation drive chip D2. The second AND gate, AND2, is used to enhance the power supply signal of the power generation equipment after the delay.

[0053] In a specific implementation, in this embodiment of the invention, an AND gate is added between the delay unit and the driver chip to avoid signal attenuation and enhance the driving capability.

[0054] Figure 6 This is a structural diagram of a failure protection module provided in an embodiment of the present invention. Figure 6 As shown, in Figures 2-5 Based on any one of the switching control circuits, the switching control circuit may also include a failure protection module, which includes a third AND gate AND3 and a fourth OR gate OR4. The input of the fourth OR gate OR4 is connected to at least one power supply signal output terminal of the power generation device of the control unit 1, and the output of the fourth OR gate OR4 is connected to the second input terminal of the third AND gate AND3; the first input terminal of the third AND gate AND3 is connected to the power grid power supply signal output terminal of the control unit 1; and the output terminal of the third AND gate AND3 is connected to the input terminal of the power generation driver chip D2 and the input terminal of the power grid driver chip D1. The failure protection module is used to output a fourth control signal when it receives a power supply signal from at least one power generation device and a power supply signal from the grid; the fourth control signal is used to put the power generation drive chip and the grid drive chip into a low-level mode.

[0055] In practice, the power grid and the power generation equipment cannot supply power at the same time. Therefore, when the power grid supply signal is issued, the power generation equipment supply signal cannot be issued. If the power grid supply signal and the power generation equipment supply signal are issued at the same time, the failure protection module can pull the power generation driver chip and the power grid driver chip low to invalidate all the instructions of the power generation driver chip and the power grid driver chip.

[0056] Figure 7 This is a structural diagram of another failure protection module provided in an embodiment of the present invention. Figure 7 As shown, in Figure 3 Based on the switching control circuit, the switching control circuit also includes a failure protection module, which may include a fourth AND gate AND4, a fifth AND gate AND5, a sixth AND gate AND6, and a fifth OR gate OR5. The first input terminal of the fourth AND gate AND4 is connected to the power grid power supply signal output terminal of the control unit 1, and the second input terminal of the fourth AND gate AND4 is connected to the first slave relay control signal output terminal of the control unit 1. The input of the fifth OR gate OR5 is connected to the power supply signal output of at least one power generation device of the control unit 1; The first input terminal of the fifth AND gate AND5 is connected to the second slave relay control signal output terminal of the control unit 1, and the second input terminal is connected to the output terminal of the fifth OR gate OR5. The first input of the sixth AND gate AND6 is connected to the output of the fourth AND gate AND4, and the second input of the sixth AND gate AND6 is connected to the output of the fifth OR gate OR5; the output of the sixth AND gate AND6 is connected to the input of the power generation driver chip D2 and the input of the grid driver chip D1. The failure protection module is used to output a fifth control signal when it receives at least one power supply signal from a power generation device, a power supply signal from the grid, a first slave relay control signal, and a second slave relay control signal; the fifth control signal is used to put the power generation drive chip and the grid drive chip into a low-level mode.

[0057] In practice, the power grid and the power generation equipment cannot supply power at the same time. Therefore, the power grid power supply signal, the power generation equipment power supply signal, the first slave relay control signal, and the second slave relay control signal cannot appear at the same time. If the power grid power supply signal, the power generation equipment power supply signal, the first slave relay control signal, and the second slave relay control signal are randomly generated, the failure protection module can pull the power generation driver chip and the power grid driver chip low to invalidate all the instructions of the power generation driver chip and the power grid driver chip.

[0058] It should be noted that, based on the switching control circuit provided in this embodiment of the invention, the control unit needs to be initialized upon initial power-on. Initialization includes first issuing a grid disconnection signal and at least one generator disconnection signal to disconnect all relays; then, grid voltage sampling and generator voltage sampling are performed. The collected values ​​are processed to determine whether they meet a voltage threshold; if the voltage threshold is met, it is considered a normal voltage. Next, it is determined whether the relays are stuck. If the relays are not stuck, a grid power supply signal or a generator power supply signal can be issued. Determining whether the relays are stuck can be achieved through the following method: 1. Power grid relays and power generation equipment relays have contact feedback. The opening and closing of power grid relays and power generation equipment relays can be obtained through contact feedback. The control unit determines the state of the relay through contact feedback, and then determines whether the relay contacts are stuck. 2. By comparing the voltage phase of the front end (power grid voltage sampling) and the voltage phase of the back end (copper bus voltage sampling) of the power grid relay and power generation equipment relay, if the contacts of the power grid relay and power generation equipment relay are stuck, the phase difference value is lower than the sticking threshold within 5 cycles, which means that the relay is considered stuck.

[0059] In summary, the switching control circuit provided in this embodiment of the invention can achieve seamless switching between power grid and power generation equipment; and the power grid control module and the power generation equipment control module, through multiple interlocks in structure and control strategy, can improve safety when a single electronic device fails; and through the failure protection module, in the event of random signal transmission, it can quickly pull the power generation driver chip and the power grid driver chip low to a low level, rendering all instructions of the power generation driver chip and the power grid driver chip invalid.

[0060] This invention also provides a switching control method, as described in the following embodiments. Since the principle behind this switching control method is similar to that of the switching control circuit described above, the implementation of this switching control method can be found in the implementation of the switching control circuit; repeated details will not be elaborated further.

[0061] The switching control method provided in this embodiment of the invention is applied to the above-mentioned switching control circuit: the switching control method may include: When the power generation equipment is supplying power: a grid disconnection signal and a power supply signal from at least one power generation equipment are issued; the grid is controlled to stop supplying power based on the grid disconnection signal and the power supply signal from at least one power generation equipment; the power supply signal from at least one power generation equipment is delayed, and the power generation equipment is controlled to start supplying power based on the delayed power supply signal from the power generation equipment. When the grid is supplying power: a grid supply signal and a disconnection signal for at least one generator are issued; the generator is controlled to stop supplying power based on the grid supply signal and the disconnection signal; the grid supply signal is delayed, and the grid is controlled to start supplying power based on the delayed grid supply signal.

[0062] This invention also provides a power distribution cabinet, which includes the aforementioned switching control circuit. The implementation of the power distribution cabinet can be found in the implementation of the switching control circuit, and will not be elaborated further here.

[0063] The switching control circuit provided in this embodiment of the invention includes: a control unit, a power grid control module, and at least one power generation equipment control module; each power generation equipment control module is used to control one power generation equipment; when the power grid is supplying power: the control unit is used to issue a power grid supply signal and at least one power generation equipment disconnection signal; at least one power generation equipment control module is used to control the power generation equipment to stop supplying power according to the power grid supply signal and the power generation equipment disconnection signal; the power grid control module is used to delay the power grid supply signal and control the power grid to start supplying power according to the delayed power grid supply signal; when the power generation equipment is supplying power: the control unit is used to issue a power grid disconnection signal and at least one power generation equipment supply signal; the power grid control module is used to control the power grid to stop supplying power according to the power grid disconnection signal and at least one power generation equipment supply signal; at least one power generation equipment control module is used to delay the power generation equipment supply signal and control the power generation equipment to start supplying power according to the delayed power generation equipment supply signal. Compared with the prior art, the embodiments of the present invention send a power grid supply signal and a power generation equipment disconnection signal or a power grid disconnection signal and a power generation equipment supply signal through the control unit. The power grid control module and at least one power generation equipment control module first disconnect the current power supply equipment according to the signal sent by the control unit, and then delay the power supply signal so that the target power supply equipment is turned on after the delay. In this way, it can be ensured that when one side is turned off, the other side can seamlessly connect to supply power. Seamless switching between the power grid and the power generation equipment can be achieved through simple operation.

[0064] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switching control circuit, characterized in that, include: The system comprises a control unit, a power grid control module, and at least one power generation equipment control module; each of the power generation equipment control modules is used to control a power generation device. When the grid supplies power: the control unit is used to send a grid supply signal and at least one generator disconnection signal; at least one generator control module is used to control the generator to stop supplying power according to the grid supply signal and the generator disconnection signal; the grid control module is used to delay the grid supply signal and control the grid to start supplying power according to the delayed grid supply signal. When the power generation equipment is supplying power: the control unit is used to issue a power grid disconnection signal and at least one power generation equipment power supply signal; The power grid control module is used to control the power grid to stop supplying power based on the power grid disconnection signal and the power supply signal of at least one of the power generation devices; at least one power generation device control module is used to delay the power supply signal of the power generation device and control the power generation device to start supplying power based on the delayed power supply signal of the power generation device.

2. The switching control circuit as described in claim 1, characterized in that, The power grid control module includes a first delay unit, a power grid driver chip, a first switching transistor, a power grid relay, a first OR gate, a second OR gate, and a second switching transistor; the power grid relay includes a power grid on coil and a power grid off coil. The input of the first delay unit is connected to the power grid supply signal output of the control unit; the first input of the first OR gate is connected to the power grid disconnection signal output of the control unit, and the second input of the first OR gate is connected to the output of the second OR gate; each input of the second OR gate is connected to the power supply signal output of a generator in the control unit; the input of the power grid driver chip is connected to the output of the first OR gate and the output of the first delay unit respectively; the output of the power grid driver chip is connected to the control terminal of the first switch and the control terminal of the second switch respectively; the first terminal of the first switch is grounded, and the second terminal of the first switch is connected to the power grid conduction coil; the first terminal of the second switch is grounded, and the second terminal of the second switch is connected to the power grid disconnection coil.

3. The switching control circuit as described in claim 2, characterized in that, Each of the power generation equipment control modules includes a second delay unit, a power generation driver chip, a third switching transistor, a power generation equipment relay, a third OR gate, and a fourth switching transistor; the power generation equipment relay includes a power generation on coil and a power generation off coil; The second delay unit's input is connected to the power supply signal output of the control unit's generator; the first input of the third OR gate is connected to the grid power supply signal output of the control unit, and the second input of the third OR gate is connected to a generator disconnection signal output of the control unit; the input of the generator driver chip is connected to the output of the third OR gate and the output of the second delay unit, respectively, and the output of the generator driver chip is connected to the control terminals of the third and fourth switches, respectively; the first terminal of the third switch is grounded, and the second terminal of the third switch is connected to the generator's conduction coil; the first terminal of the fourth switch is grounded, and the second terminal of the fourth switch is connected to the generator's disconnection coil.

4. The switching control circuit as described in claim 3, characterized in that, When the power grid is supplying power, each of the power generation equipment control modules is configured to: output a first control signal based on the power grid supply signal and the power generation equipment disconnection signal; generate a first drive signal based on the first control signal and output it to a fourth switch; the fourth switch is turned on in response to the first drive signal and transmits the first drive signal to the power generation equipment disconnection coil; the power generation equipment disconnection coil is turned on in response to the first drive signal, causing the power generation equipment to stop supplying power. The power grid control module is specifically configured to: delay the power grid supply signal by the first delay unit; generate a second drive signal based on the delayed power grid supply signal and output it to the first switch; transmit the second drive signal to the power grid conduction coil in response to the second drive signal; and enable the power grid to start supplying power in response to the second drive signal.

5. The switching control circuit as described in claim 3, characterized in that, When the power generation equipment supplies power, the power grid control module is specifically configured to: the second OR gate outputs a second control signal based on the power supply signal of at least one power generation equipment; the first OR gate outputs a third control signal based on the second control signal and the power grid disconnection signal; the power grid drive chip generates a third drive signal based on the third control signal and outputs it to the second switching transistor; the second switching transistor turns on in response to the third drive signal and transmits the third drive signal to the power grid disconnection coil; the power grid disconnection coil turns on in response to the third drive signal, causing the power grid to stop supplying power. Each of the aforementioned power generation equipment control modules is specifically configured to: delay the power supply signal of the power generation equipment by the second delay unit; generate a fourth drive signal based on the delayed power supply signal of the power generation equipment and output it to the third switch; the third switch is turned on in response to the fourth drive signal and transmits the fourth drive signal to the power generation equipment conduction coil; the power generation equipment conduction coil is turned on in response to the fourth drive signal, causing the power generation equipment to start supplying power.

6. The switching control circuit as described in claim 4, characterized in that, The power grid control module further includes a first slave relay and a fifth switch; the first end of the fifth switch is connected to the control signal output terminal of the first slave relay of the control unit, the second end of the fifth switch is connected to the first end of the coil of the first slave relay, and the third end of the fifth switch is grounded; the second end of the coil of the first slave relay is connected to a first DC voltage source; the two ends of the contacts of the first slave relay are respectively connected to the second end of the first switch and the power grid conduction coil. When the grid is supplying power, the control unit is also used to: issue a first slave relay control signal; The power grid control module is further configured to: the fifth switch, in response to the first slave relay control signal being turned on, transmit the first slave relay control signal to the first slave relay; the first slave relay, in response to the first slave relay control signal being turned on, transmit the second drive signal to the power grid conduction coil after the first switch is turned on; the power grid conduction coil, in response to the second drive signal being turned on, causes the power grid to start supplying power.

7. The switching control circuit as described in claim 6, characterized in that, Each of the power generation equipment control modules further includes a second slave relay and a sixth switch; the first end of the sixth switch is connected to the control signal output terminal of the second slave relay of the control unit, the second end of the sixth switch is connected to the first end of the coil of the second slave relay, and the third end of the sixth switch is grounded; the second end of the coil of the second slave relay is connected to a second DC voltage source; the two ends of the contacts of the second slave relay are respectively connected to the second end of the third switch and the power generation equipment conduction coil. When the power generation equipment supplies power, the control unit is also used to: issue at least one second slave relay control signal; Each of the power generation equipment control modules is further configured to: the sixth switch, in response to the second slave relay control signal being turned on, transmit the second slave relay control signal to the second slave relay; the second slave relay, in response to the second slave relay control signal being turned on, transmit the fourth drive signal to the power generation equipment conduction coil after the third switch is turned on; the power generation equipment conduction coil, in response to the fourth drive signal being turned on, causes the power generation equipment to start supplying power.

8. The switching control circuit as described in claim 6, characterized in that, The power grid control module also includes a third slave relay; the two ends of the coil of the third slave relay are respectively connected to the two ends of the first AC power supply; the two ends of the contacts of the third slave relay are respectively connected to the contacts of the first slave relay and the power grid conduction coil.

9. The switching control circuit as described in claim 7, characterized in that, Each of the power generation equipment control modules further includes a fourth slave relay; the two ends of the coil of the fourth slave relay are respectively connected to the two ends of the second AC power supply; the two ends of the contacts of the fourth slave relay are respectively connected to the contacts of the second slave relay and the power generation equipment conduction coil.

10. The switching control circuit as described in claim 2, characterized in that, The power grid control module further includes a first AND gate, the input of which is connected to the output of the first delay unit, and the output of which is connected to the input of the power grid driver chip. The first AND gate is used to enhance the delayed power grid supply signal.

11. The switching control circuit as described in claim 3, characterized in that, Each of the power generation equipment control modules further includes a second AND gate, the input of which is connected to the output of the second delay unit, and the output of which is connected to the input of the power generation driver chip; The second AND gate is used to enhance the power supply signal of the power generation equipment after the delay.

12. The switching control circuit as described in claim 3, characterized in that, The switching control circuit further includes a failure protection module, which includes a third AND gate and a fourth OR gate. The input of the fourth OR gate is connected to at least one power supply signal output of the control unit; the output of the fourth OR gate is connected to the second input of the third AND gate; the first input of the third AND gate is connected to the power grid power supply signal output of the control unit; and the output of the third AND gate is connected to the input of the power generation driver chip and the input of the power grid driver chip. The failure protection module is used to output a fourth control signal when it receives a power supply signal from at least one power generation device and a power supply signal from the grid; the fourth control signal is used to put the power generation drive chip and the grid drive chip into a low-level mode.

13. The switching control circuit as described in claim 7, characterized in that, The switching control circuit further includes a failure protection module, which includes a fourth AND gate, a fifth AND gate, a sixth AND gate, and a fifth OR gate. The first input terminal of the fourth AND gate is connected to the mains power supply signal output terminal of the control unit, and the second input terminal of the fourth AND gate is connected to the first slave relay control signal output terminal of the control unit. The input of the fifth OR gate is connected to the power supply signal output of at least one power generation device of the control unit; The first input terminal of the fifth AND gate is connected to the second slave relay control signal output terminal of the control unit, and the second input terminal is connected to the output terminal of the fifth OR gate. The first input of the sixth AND gate is connected to the output of the fourth AND gate, and the second input of the sixth AND gate is connected to the output of the fifth OR gate; the output of the sixth AND gate is connected to the input of the power generation driver chip and the input of the power grid driver chip. The failure protection module is used to output a fifth control signal when it receives at least one power supply signal from a power generation device, a power grid signal, a first slave relay control signal, and a second slave relay control signal; the fifth control signal is used to put the power generation drive chip and the power grid drive chip into a low-level mode.

14. A switching control method, characterized in that, Applied to the switching control circuit as described in any one of claims 1-13; The switching control method includes: When the grid supplies power: a grid supply signal and a disconnection signal for at least one power generation device are issued; the power generation device is controlled to stop supplying power based on the grid supply signal and the disconnection signal; the grid supply signal is delayed, and the grid is controlled to start supplying power based on the delayed grid supply signal; When the power generation equipment is supplying power: a grid disconnection signal and at least one power generation equipment power supply signal are issued; the grid is controlled to stop supplying power according to the grid disconnection signal and at least one power generation equipment power supply signal; the power generation equipment power supply signal of at least one power generation equipment is delayed, and the power generation equipment is controlled to start supplying power according to the delayed power generation equipment power supply signal.

15. A power distribution cabinet, characterized in that, The power distribution cabinet includes the switching control circuit as described in any one of claims 1-13.

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