Circuit system, control method of circuit system, controller and storage medium

Abstract

The present disclosure provides a circuit system, a control method for the circuit system, a controller, and a non-transitory computer-readable storage medium, and relates to the field of electronic circuit technology. The circuit system includes: a system power supply; a magnetic latching relay electrically connected to the system power supply; a DC bus electrically connected to the magnetic latching relay; a DC bus capacitor arranged between the DC buses; and a controller electrically connected to the DC bus capacitor; wherein, when the system power supply stops supplying power, the controller uses the electric energy stored in the DC bus capacitor to send a disconnection control pulse to the magnetic latching relay. The present disclosure uses the residual electricity stored in the DC bus capacitor to drive the magnetic latching relay to disconnect when the system power supply stops supplying power, so that the voltage on the DC bus capacitor is discharged quickly, thereby improving the safety of the circuit system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic circuits, and in particular to a circuit system, a control method of the circuit system, a controller, and a non-transitory computer-readable storage medium. Background Art

[0002] In a circuit system, a DC contactor or relay is usually used to control the connection and disconnection between electrical equipment and a power source.

[0003] Taking the photovoltaic system as an example, the voltage on the photovoltaic panel is connected to the high-voltage DC bus through the DC-DC converter, and then connected to the power grid through the DC-AC converter. A DC contactor is set between the photovoltaic panel and the DC / DC converter to reliably and controllably connect and disconnect the photovoltaic panel; a relay is set between the DC / AC converter and the power grid to reliably and controllably connect and disconnect the power grid. Summary of the invention

[0004] A technical problem solved by the present disclosure is how to improve the safety of the circuit system.

[0005] According to one aspect of the present disclosure, there is provided a circuit system, comprising: a system power supply; a magnetic latching relay electrically connected to the system power supply; a DC bus electrically connected to the magnetic latching relay; a DC bus capacitor arranged between the DC buses; and a controller electrically connected to the DC bus capacitor; wherein, when the system power supply stops supplying power, the controller uses the electrical energy stored in the DC bus capacitor to send a disconnect control pulse to the magnetic latching relay.

[0006] In some embodiments, the controller is electrically connected to a system power supply; when the system power supply is powered, the controller uses the electrical energy provided by the system power supply to send a closing control pulse to the magnetic latching relay.

[0007] In some embodiments, the disconnect control pulse is a first pulse signal; the magnetic holding relay includes: a first optocoupler electrically connected to the ground terminal of the magnetic holding relay; a coil electrically connected to the first optocoupler and the power supply terminal of the magnetic holding relay respectively; and a permanent magnet coupled to the coil; wherein the first optocoupler is turned on when receiving the first pulse signal, and the current in the first direction in the coil drives the permanent magnet to move to disconnect the magnetic holding relay.

[0008] In some embodiments, the disconnect control pulse is a first pulse signal, and the closing control pulse includes a second pulse signal and a third pulse signal; the magnetic holding relay includes: a first optocoupler and a second optocoupler electrically connected to the ground terminal of the magnetic holding relay; an electromagnetic relay electrically connected to the power terminal of the magnetic holding relay, the electromagnetic relay including a first contact and a second contact; a coil electrically connected to the first optocoupler, the second optocoupler, and the electromagnetic relay respectively; a permanent magnet coupled to the coil; wherein the first optocoupler is turned on when receiving the first pulse signal, the electromagnetic relay connects the first contact, and the current in the first direction in the coil drives the permanent magnet to move to disconnect the magnetic holding relay; the second optocoupler is turned on when receiving the second pulse signal, the electromagnetic relay connects the second contact when receiving the third pulse signal, and the current in the second direction in the coil drives the permanent magnet to move to close the magnetic holding relay, and the second direction is opposite to the first direction.

[0009] In some embodiments, the controller includes: a power board electrically connected to the DC bus; a control board electrically connected to the power board; when the system power stops supplying power, the control board obtains the electrical energy stored in the DC bus capacitor through the power board and sends a disconnect control pulse to the magnetic holding relay.

[0010] In some embodiments, the power board is electrically connected to the system power supply. When the system power supply is powered, the control board obtains the electric energy provided by the system power supply through the power board and sends a closing control pulse to the magnetic latching relay.

[0011] In some embodiments, the system power supply includes: a grid power supply and a photovoltaic power supply; the magnetic latching relay includes: a first magnetic latching relay electrically connected to the grid power supply and a second magnetic latching relay electrically connected to the photovoltaic power supply.

[0012] In some embodiments, there are plural first magnetic latching relays and plural second magnetic latching relays.

[0013] In some embodiments, the circuit system also includes: a DC-AC converter electrically connected to the DC bus and the first magnetic holding relay, respectively; a compressor drive circuit electrically connected to the DC-AC converter and the DC-AC converter, respectively; a motor electrically connected to the compressor drive circuit; a DC-DC converter electrically connected to the second magnetic holding relay and the DC bus, respectively; and an energy storage circuit electrically connected to the DC-DC converter and the DC bus, respectively.

[0014] In some embodiments, the compressor driving circuit is a compressor driving circuit of an air conditioner, and the motor is a motor of an air conditioner.

[0015] According to another aspect of the present disclosure, a control method for a circuit system is provided, and the circuit system is the aforementioned circuit system, including: when the system power supply stops supplying power, the controller uses the electric energy stored in the DC bus capacitor to send a disconnection control pulse to the magnetic latching relay; when the system power supply is supplying power, the controller uses the electric energy provided by the system power supply to send a closing control pulse to the magnetic latching relay.

[0016] According to another aspect of the present disclosure, a controller is provided, including: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the aforementioned control method of the circuit system based on instructions stored in the memory.

[0017] According to another aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the aforementioned control method of the circuit system is implemented.

[0018] In the case where the system power supply stops supplying power, the present invention utilizes the residual power stored in the DC bus capacitor to drive the magnetic latching relay to disconnect, so that the voltage on the DC bus capacitor is discharged quickly, thereby improving the safety of the circuit system.

[0019] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of the structure of the circuit system of some embodiments of the present disclosure is shown.

[0022] Figure 2 A schematic structural diagram of a magnetic latching relay according to some embodiments of the present disclosure is shown.

[0023] Figure 3 Shows a situation where the latching relay needs to be opened.

[0024] Figure 4 Shows a situation where a latching relay needs to be closed.

[0025] Figure 5 A flow chart of a control method of a circuit system according to some embodiments of the present disclosure is shown.

[0026] Figure 6 A schematic diagram of the structure of a controller according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] The inventor has found that a DC bus capacitor is usually provided between the DC buses of the circuit system. When the system power supply stops supplying power, the voltage on the DC bus capacitor discharges slowly, which causes a safety hazard to the circuit system. At the same time, when the circuit system is running under the power supply of the system power supply, the DC contactor and relay will consume a high amount of electric energy and generate serious heat, which not only reduces the operating efficiency of the circuit system, but also causes the heat dissipation problem of the circuit system, thereby reducing the safety of the circuit system.

[0029] In order to improve the safety of the circuit system, the inventor provides a circuit system, which is described in detail below.

[0030] First combine Figure 1 Some embodiments of the disclosed circuit system are described.

[0031] Figure 1 A schematic diagram of the structure of the circuit system of some embodiments of the present disclosure is shown. Figure 1 The circuit system 10 in the embodiment includes: a system power supply 101; a magnetic latching relay 102 electrically connected to the system power supply 101; a DC bus 103 electrically connected to the magnetic latching relay 102; a DC bus capacitor 104 disposed between the DC bus 103; and a controller 105 electrically connected to the DC bus capacitor 104. When the system power supply 101 stops supplying power, the controller 105 uses the electric energy stored in the DC bus capacitor 104 to send a disconnection control pulse to the magnetic latching relay 102.

[0032] Those skilled in the art will understand that when the system power supply stops supplying power, the residual power stored in the DC bus capacitor cannot provide power permanently, but can provide power for a period of time. The power during this period of time powers the controller, enabling the controller to send a disconnect control pulse signal. The magnetic latching relay is disconnected under the action of the disconnect control pulse signal and remains disconnected. Using the residual power stored in the DC bus capacitor to drive the magnetic latching relay to disconnect can quickly discharge the voltage on the DC bus capacitor, thereby improving the safety of the circuit system.

[0033] In some embodiments, the controller 105 is electrically connected to the system power supply 101. When the system power supply 101 supplies power, the controller 105 uses the power provided by the system power supply 101 to send a closing control pulse to the magnetic latching relay 102.

[0034] During the operation of the circuit system, the magnetic latching relay is closed under the action of the closing control pulse and remains closed without the need for continuous power supply, thus avoiding the phenomenon of severe heating of the DC contactor and relay. In this way, not only the power loss of the circuit system is reduced, but also the heat dissipation problem during the operation of the circuit system can be alleviated, further improving the safety of the circuit system.

[0035] In some embodiments, the controller 105 includes: a power board 1051 electrically connected to the DC bus 103 ; and a control board 1052 electrically connected to the power board 1051 .

[0036] When the system power supply 101 stops supplying power, the control board 1052 obtains the electric energy stored in the DC bus capacitor 104 through the power board 1051 , and sends a disconnection control pulse to the magnetic latching relay 102 .

[0037] In some embodiments, the power board 1051 is electrically connected to the system power supply 101 .

[0038] When the system power supply 101 is supplying power, the control board 1052 obtains the electric energy provided by the system power supply 101 through the power board 1051 , and sends a closing control pulse to the magnetic latching relay 102 .

[0039] In some embodiments, the system power supply 101 includes: a grid power supply 1012 and a photovoltaic power supply 1012, and the photovoltaic power supply can be, for example, a photovoltaic panel. The magnetic latching relay 102 includes: a first magnetic latching relay 1021 electrically connected to the grid power supply 1012 and a second magnetic latching relay 1022 electrically connected to the photovoltaic power supply 1012.

[0040] In some embodiments, the number of the first magnetic latching relay 1021 and the second magnetic latching relay 1022 may be one or more. For example, the first magnetic latching relay 1021 includes K1, K2, K3, and K4, and the second magnetic latching relay 1022 includes K5 and K6.

[0041] In some embodiments, the circuit system 10 also includes: a DC-AC converter 105 electrically connected to the DC bus 103 and the first magnetic holding relay 1021, respectively; a compressor drive circuit 106 electrically connected to the DC-AC converter 105 and the DC-AC converter 105, respectively; a motor 107 electrically connected to the compressor drive circuit 106; a DC-DC converter 108 electrically connected to the second magnetic holding relay 1022 and the DC bus 103, respectively; and an energy storage circuit 109 electrically connected to the DC-DC converter 108 and the DC bus 103, respectively.

[0042] In some embodiments, the compressor driving circuit 106 is a compressor driving circuit 106 of an air conditioner, and the motor 107 is a motor 107 of an air conditioner. In this case, the circuit system is an air conditioning system capable of reducing power consumption.

[0043] The working process of the circuit system is specifically exemplified as follows.

[0044] (1) System power supply

[0045] The control board sends out control pulses to energize the coils of K1, K2, K3, and K4, and K1, K2, K3, and K4 are closed. Then, the control board turns off the control pulses to keep K1, K2, K3, and K4 closed, and the circuit system operates normally. When the photovoltaic power generation power supply needs to be connected to the system, K5 and K6 are closed in a similar control manner.

[0046] (2) When the system power is turned off

[0047] Since the voltage on the DC bus capacitor needs to be discharged, the power board can maintain power supply for a period of time. Based on this, the control board outputs control pulses to reverse the power supply of the coils of K1, K2, K3, K4, K5, and K6. K1, K2, K3, K4, K5, and K6 are reset and disconnected to prepare for the next startup operation.

[0048] Combine the following Figure 2 Some embodiments of the magnetic latching relay of the present disclosure are described.

[0049] Figure 2 A schematic structural diagram of a magnetic latching relay according to some embodiments of the present disclosure is shown.

[0050] In some embodiments, the disconnection control pulse is a first pulse signal. The magnetic latching relay 102 includes: a first optical coupler 2021 electrically connected to the ground terminal of the magnetic latching relay; a coil 2022 electrically connected to the first optical coupler 2021 and the power supply terminal VCC of the magnetic latching relay 102; and a permanent magnet 2023 coupled to the coil 2022.

[0051] The first optical coupler 2021 is turned on when receiving the first pulse signal, and the current in the first direction in the coil 2022 drives the permanent magnet 2023 to move so that the magnetic latching relay 102 is disconnected.

[0052] In some embodiments, the opening control pulse is a first pulse signal, and the closing control pulse includes a second pulse signal and a third pulse signal. The magnetic latching relay 102 includes: a first optical coupler 2021 and a second optical coupler 2024 electrically connected to the ground terminal of the magnetic latching relay; an electromagnetic relay 2025 electrically connected to the power supply terminal VCC of the magnetic latching relay 102, and the electromagnetic relay 2025 includes a first contact 20251 and a second contact 20252; a coil 2022 electrically connected to the first optical coupler 2021, the second optical coupler 2024, and the electromagnetic relay 2025 respectively; and a permanent magnet 2023 coupled to the coil 2022.

[0053] The first optical coupler 2021 is turned on when receiving the first pulse signal, the electromagnetic relay connects the first contact 20251, and the current in the first direction in the coil 2022 drives the permanent magnet 2023 to move so that the magnetic holding relay 102 is disconnected.

[0054] The second optocoupler 2024 is turned on when receiving the second pulse signal, and the electromagnetic relay 2025 is turned on when receiving the third pulse signal. The current in the second direction in the coil 2022 drives the permanent magnet 2023 to move to close the magnetic holding relay 102. The second direction is opposite to the first direction.

[0055] The specific working process of the magnetic latching relay is shown below.

[0056] (1) Figure 3 Shows a situation where the latching relay needs to be opened.

[0057] The control board outputs the first pulse signal S21, the electromagnetic relay connects contact 1, the first optical coupler starts to work, the magnetic latching relay coil is energized, and the magnetic latching relay is disconnected. Then, the control board outputs the first pulse signal S21 and turns it off. The duration of the pulse signal S21 can be adjusted according to the actual component selection, for example, it can be set to 200 milliseconds.

[0058] (2) Figure 4 Shows a situation where a latching relay needs to be closed.

[0059] The control board outputs the second pulse signal S22 and the third pulse signal S23. S22 starts the second optical coupler to work, and S23 switches the electromagnetic relay to contact 2. The magnetic latching relay coil is reversely energized, and the magnetic latching relay is closed. Then, the control board outputs the second pulse signal S22 and the third pulse signal S23. The duration of the pulse signals S22 and S23 can be adjusted according to the actual component selection, for example, it can be set to 200 milliseconds.

[0060] Combine the following Figure 5 Some embodiments of the control method of the disclosed circuit system are described.

[0061] Figure 5 FIG. 1 is a flow chart showing a control method of a circuit system according to some embodiments of the present disclosure. Figure 5 As shown, the control method of the circuit system includes steps S501 to S502, wherein the circuit system is the circuit system in any of the aforementioned embodiments.

[0062] In step S501, when the system power supply stops supplying power, the controller uses the electric energy stored in the DC bus capacitor to send a disconnection control pulse to the magnetic latching relay.

[0063] In step S502, when the system power supply is on, the controller uses the power provided by the system power supply to send a closing control pulse to the magnetic latching relay.

[0064] When the system power supply stops, the residual electricity stored in the DC bus capacitor cannot provide power permanently, but can provide power for a period of time. The power during this period of time powers the controller, which enables the controller to send a disconnection control pulse signal. The magnetic latching relay is disconnected under the action of the disconnection control pulse signal and remains disconnected. Using the residual electricity stored in the DC bus capacitor to drive the magnetic latching relay to disconnect can quickly discharge the voltage on the DC bus capacitor, thereby improving the safety of the circuit system.

[0065] During the operation of the circuit system, the magnetic latching relay is closed under the action of the closing control pulse and remains closed without the need for continuous power supply, thus avoiding the phenomenon of severe heating of the DC contactor and relay. In this way, not only the power loss of the circuit system is reduced, but also the heat dissipation problem during the operation of the circuit system can be alleviated, further improving the safety of the circuit system.

[0066] Combine the following Figure 6 Some embodiments of the disclosed controller are described.

[0067] Figure 6 FIG. 1 is a schematic diagram showing the structure of a controller in some embodiments of the present disclosure. Figure 6 As shown, the controller 60 includes: a memory 610 and a processor 620 coupled to the memory 610 , and the processor 620 is configured to execute the circuit system in any of the aforementioned embodiments based on instructions stored in the memory 610 .

[0068] The memory 610 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0069] The controller 60 may also include an input / output interface 630, a network interface 640, a storage interface 650, etc. These interfaces 630, 640, 650, the memory 610, and the processor 620 may be connected, for example, via a bus 660. The input / output interface 630 provides a connection interface for input / output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 640 provides a connection interface for various networked devices. The storage interface 650 provides a connection interface for external storage devices such as an SD card and a USB flash drive.

[0070] The present disclosure also includes a computer-readable storage medium having computer instructions stored thereon, which implement the circuit system in any of the aforementioned embodiments when the instructions are executed by a processor.

[0071] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0074] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A circuit system, comprising: System power supply; A magnetic latching relay electrically connected to a system power supply; A DC busbar electrically connected to the magnetic latching relay; A DC bus capacitor disposed between the DC buses; as well as a controller electrically connected to the DC bus capacitor; Wherein, when the system power supply stops supplying power, the controller uses the electric energy stored in the DC bus capacitor to send a disconnection control pulse to the magnetic latching relay, so that the magnetic latching relay remains in a disconnected state so that the DC bus capacitor discharges, and the disconnection control pulse is a first pulse signal; Magnetic latching relays include: a first optical coupler electrically connected to the ground terminal of the magnetic latching relay; A coil electrically connected to the first optical coupler and the power supply terminal of the magnetic latching relay respectively; a permanent magnet coupled to the coil; The first optical coupler is turned on when receiving the first pulse signal, and the current in the first direction in the coil drives the permanent magnet to move to disconnect the magnetic latching relay.

2. The circuit system according to claim 1, wherein: The controller is electrically connected to the system power supply; when the system power supply is powered, the controller uses the electric energy provided by the system power supply to send a closing control pulse to the magnetic latching relay.

3. The circuit system according to claim 2, wherein: The opening control pulse is a first pulse signal, and the closing control pulse includes a second pulse signal and a third pulse signal; Magnetic latching relays include: a first optical coupler and a second optical coupler electrically connected to the ground terminal of the magnetic latching relay; An electromagnetic relay electrically connected to the power supply terminal of the magnetic latching relay, the electromagnetic relay comprising a first contact and a second contact; A coil electrically connected to the first optical coupler, the second optical coupler, and the electromagnetic relay respectively; a permanent magnet coupled to the coil; Wherein, the first optical coupler is turned on when receiving the first pulse signal, the electromagnetic relay connects the first contact, and the current in the first direction in the coil drives the permanent magnet to move so that the magnetic latching relay is disconnected; The second optocoupler is turned on when receiving the second pulse signal, and the electromagnetic relay turns on the second contact when receiving the third pulse signal. The current in the second direction in the coil drives the permanent magnet to move to close the magnetic holding relay, and the second direction is opposite to the first direction.

4. The circuit system according to claim 1, wherein: The controller includes: a power board electrically connected to the DC bus; A control board electrically connected to the power board; When the system power supply stops supplying power, the control board obtains the electric energy stored in the DC bus capacitor through the power board and sends a disconnection control pulse to the magnetic latching relay.

5. The circuit system according to claim 4, wherein: The power board is electrically connected to the system power supply. When the system power supply is powered, the control board obtains the electric energy provided by the system power supply through the power board and sends a closing control pulse to the magnetic latching relay.

6. The circuit system according to claim 1, wherein: The system power supply includes: grid power supply and photovoltaic power generation power supply; The magnetic latching relay comprises: a first magnetic latching relay electrically connected to a grid power supply and a second magnetic latching relay electrically connected to a photovoltaic power supply.

7. The circuit system according to claim 6, wherein: The number of the first magnetic latching relays and the number of the second magnetic latching relays are plural.

8. The circuit system according to claim 6, further comprising: a DC-AC converter electrically connected to the DC bus and the first magnetic latching relay respectively; a compressor drive circuit electrically connected to the DC-AC converter and the DC-AC converter, respectively; a motor electrically connected to the compressor drive circuit; a DC-DC converter electrically connected to the second magnetic latching relay and the DC bus, respectively; An energy storage circuit is electrically connected to the DC-DC converter and the DC bus respectively.

9. The circuit system according to claim 8, wherein: The compressor driving circuit is a compressor driving circuit of an air conditioner, and the motor is a motor of an air conditioner.

10. A control method for a circuit system, wherein the circuit system is the circuit system according to any one of claims 1 to 9, comprising: When the system power supply stops, the controller uses the energy stored in the DC bus capacitor to send a disconnection control pulse to the magnetic latching relay; When the system power supply is on, the controller uses the power provided by the system power supply to send a closing control pulse to the magnetic latching relay.

11. A controller, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the control method of the circuit system according to claim 10 based on instructions stored in the memory.

12. A non-transitory computer-readable storage medium, wherein: The non-transitory computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the control method of the circuit system according to claim 10 is implemented.

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