Power equipment protection method and control device
By connecting switching units with different resistance values in parallel in power equipment, and using a first switching unit with fast turn-off to turn off first, followed by a second switching unit with a larger resistance to turn off later, the problem of power equipment being unable to be safely turned off under abnormal conditions is solved, thus achieving safe shutdown of the equipment and reducing energy loss.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2024-10-18
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, power equipment cannot be safely shut down under abnormal conditions. Voltage spikes can easily be generated during the shutdown process of the switching module, leading to equipment damage.
The system employs a first and second switching unit connected in parallel. The first switching unit has a small resistance and a fast response speed, turning off the first unit first and then turning off the second unit. The larger resistance of the second switching unit reduces voltage spike stress. In abnormal conditions, the system controls the first switching unit to turn off first, followed by the second switching unit, to ensure safe shutdown of the equipment.
It effectively reduces voltage spike stress, ensures safe shutdown of power equipment, reduces the risk of equipment damage, and reduces energy loss and heat dissipation costs.
Smart Images
Figure CN121906353A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of equipment protection technology, and specifically relates to a protection method and control device for power equipment. Background Technology
[0002] In power equipment such as inverters, converters, and rectifiers, switching modules are generally used to control the switching on and off of power. However, current switching modules cannot guarantee the safe shutdown of power equipment when it is in an abnormal state. Summary of the Invention
[0003] The purpose of this application is to provide a method for protecting power equipment, which aims to overcome the technical problem that power equipment cannot be safely shut down when an abnormality occurs; another purpose of this application is to provide a control device for power equipment.
[0004] Technical solution: The present application describes a method for protecting power equipment, wherein the power equipment includes a switch module, the switch module includes a first switch unit and a second switch unit connected in parallel, the resistance value of the first switch unit is less than the resistance value of the second switch unit, and the first switch unit and the second switch unit are of different types;
[0005] The protection method includes:
[0006] In response to a first signal emitted by the power equipment, the first switching unit is controlled to switch from the on state to the off state.
[0007] After the first switch unit switches to the off state, the second switch unit is controlled to switch from the on state to the off state.
[0008] In some embodiments, the first signal is a signal emitted when the voltage or current of the power equipment exceeds a preset range, or a signal emitted when the power equipment receives fault information sent by the host computer.
[0009] In some embodiments, the first switching unit includes at least two first switches, which are connected in series or in parallel to form the first switching unit; the second switching unit includes at least two second switches, which are connected in series or in parallel to form the second switching unit; and multiple first switches and multiple second switches share a single operating signal.
[0010] In some embodiments, the protection method further includes:
[0011] In response to a second signal emitted by the power equipment, the first switching unit is controlled to switch from the off state to the on state;
[0012] After the first switching unit switches from the off state to the on state, the second switching unit is controlled to switch from the off state to the on state.
[0013] In some embodiments, the second signal is a signal emitted when the voltage or current of the power equipment meets a preset range.
[0014] In some embodiments, after controlling the second switching unit to switch from an off state to an on state, the protection method further includes:
[0015] Control the first switching unit to switch from the on state to the off state.
[0016] In some embodiments, after controlling the first switching unit to switch from an on state to an off state, the protection method further includes:
[0017] In response to a third signal emitted by the power equipment, the first switching unit is controlled to switch from an off state to an on state, wherein the third signal is a signal emitted by the power equipment when it indicates a shutdown.
[0018] After the first switching unit switches from the off state to the on state, the second switching unit is controlled to switch from the on state to the off state.
[0019] After the second switching unit switches from the on state to the off state, the first switching unit is controlled to switch from the on state to the off state.
[0020] In some embodiments, the protection method further includes:
[0021] In response to a third signal emitted by the power equipment, the second switching unit is controlled to switch from an on state to an off state, wherein the third signal is a signal emitted by the power equipment when it indicates a shutdown.
[0022] After the second switching unit switches from the on state to the off state, the first switching unit is controlled to switch from the on state to the off state.
[0023] In some embodiments, the first switching unit is a wide bandgap semiconductor device, the second switching unit is a silicon-based semiconductor device, or the second switching unit is a relay.
[0024] A control device for power equipment, the power equipment further comprising a switch module connected to the control device, the switch module comprising a first switch unit and a second switch unit connected in parallel, the resistance value of the first switch unit being less than the resistance value of the second switch unit;
[0025] The control device is used to respond to a first signal emitted by the power equipment, control the first switching unit to switch from an on state to an off state, and after the first switching unit switches to the off state, control the second switching unit to switch from an on state to an off state.
[0026] In some embodiments, the power equipment further includes:
[0027] A drive unit is connected between the control device and the switch module.
[0028] The power equipment protection method of this application embodiment includes a power equipment including a switch module, which includes a first switch unit and a second switch unit connected in parallel. The resistance value of the first switch unit is less than that of the second switch unit, and the first and second switch units are of different types. The protection method includes: in response to a first signal issued by the power equipment, controlling the first switch unit to switch from a conducting state to a turning-off state; and after the first switch unit switches to the turning-off state, controlling the second switch unit to switch from a conducting state to a turning-off state. Power is supplied to the power equipment through the parallel first and second switch units. When an abnormality occurs in the power equipment, it sends a first signal to the switch module. Upon receiving the turning-off signal, the first and second switch units in the switch module turn off first, followed by the second switch unit, because the switching speed of the first switch unit is faster than that of the second switch unit. After the first switching unit is turned off and before the second switching unit is turned off, the current in the equipment only flows through the second switching unit. When the second switching unit is turned off, because the second switching unit has a large resistance value, the voltage spike stress generated when it is turned off is small. Therefore, it can protect the power equipment when the circuit is turned off and ensure the safe shutdown of the power equipment. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 A logic flowchart of a switching module for power equipment malfunction provided in an embodiment of this application;
[0031] Figure 2 The switching timing diagram of the switching module when the power equipment is malfunctioning, provided in the embodiments of this application;
[0032] Figure 3 This is a schematic diagram of the structure of the switch module provided in an embodiment of this application;
[0033] Figure 4 A logic flowchart of a power equipment switching module under normal operation provided in an embodiment of this application;
[0034] Figure 5 A switching timing diagram of a power equipment switching module under normal conditions provided in an embodiment of this application;
[0035] Figure 6 Another logic flowchart of the switching module of the power equipment under normal operation provided in the embodiments of this application;
[0036] Figure 7 Another switching timing diagram of the switching module of the power equipment under normal conditions provided in the embodiments of this application;
[0037] Figure 8 This is a third logic flowchart of the switching module for power equipment during normal operation, provided in an embodiment of this application.
[0038] Figure 9 This application provides a third type of switching timing diagram for a power equipment switching module during normal operation, as shown in the embodiments of this application.
[0039] Figure 10 A schematic diagram illustrating the working process of the control device and switch module provided in the embodiments of this application;
[0040] Figure 11 A schematic diagram illustrating the workflow of the control device, drive unit, and switch module provided in the embodiments of this application;
[0041] Reference numerals: 10-Switch module; 11-First switch unit; 12-Second switch unit; 20-Drive unit; 30-Control device. Detailed Implementation
[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0043] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.
[0044] As an introduction to the embodiments of this application, a method for protecting power equipment is introduced. In power equipment such as inverters, converters, and rectifiers, the conduction and cutoff of power in the equipment are generally controlled by a switching module. The switching module can be a single SiC or GaN wide bandgap semiconductor device, or it can be a silicon-based device. When the power equipment is in an abnormal state, such as when the equipment malfunctions or the voltage in the equipment exceeds the limit and the equipment is in a high-voltage state, it is necessary to shut down the switching module under these abnormal states. However, when shutting down using a wide bandgap semiconductor device, due to its small resistance value, a large voltage spike stress will be generated during shutdown, which can damage the equipment and cannot guarantee the safe shutdown of the power equipment.
[0045] In view of the above, embodiments of this application provide a method for protecting electrical equipment to overcome at least one of the above-mentioned technical problems.
[0046] Please see Figure 1 , Figure 2 and Figure 3 In this embodiment of the application, the protection method for the power equipment includes a switch module 10, which controls the conduction and cutoff of power in the equipment. The switch module 10 includes a first switch unit 11 and a second switch unit 12 connected in parallel. The first switching unit 11 and the second switching unit 12 are of different types and have some different characteristics. For example, the resistance value of the first switching unit 11 is less than that of the second switching unit 12. When corresponding on / off signals are sent to the first switching unit 11 and the second switching unit 12, the first switching unit 11 responds to the signal faster than the second switching unit 12. That is, if the first switching unit 11 and the second switching unit 12 receive signals at the same time, the first switching unit 11 turns on or off faster than the second switching unit 12. When the first switching unit 11 turns on or off, its loss is less than that when the second switching unit 12 turns on or off. However, when the first switching unit 11 and the second switching unit 12 are on for a long time, the loss of the first switching unit 11 during long-term on-time conduction is greater than that of the second switching unit during long-term on-time conduction.
[0047] The protection method for power equipment includes: responding to a first signal emitted by the power equipment, controlling the first switching unit 11 to switch from a conducting state to a turning-off state; after the first switching unit 11 switches to the turning-off state, controlling the second switching unit 12 to switch from a conducting state to a turning-off state. When the power equipment detects an abnormality, other modules on it send a first signal to the switching module 10, causing the originally conducting switching module 10 to disconnect (originally, both the first switching unit 11 and the second switching unit 12 in the switching module 10 were in a conducting state), interrupting the current flow and stopping the equipment from working. The switching module 10 responds to the first signal when the power equipment is in an abnormal state. Since the response speed of the first switching unit 11 to turn on or off is faster than that of the second switching unit 12, the first switching unit 11 on the switching module 10 will switch from its original conducting state to the turning-off state first. After the first switching unit 11 turns off and before the second switching unit 12 turns off, the current in the power equipment flows through the second switching unit 12, and the power equipment continues to work. After the first switching unit 11 switches to the off state, when the second switching unit 12 responds to the first signal and switches off, it switches from the on state to the off state. Because the second switching unit 12 has a larger resistance value than the first switching unit 11, the voltage spike stress generated when it switches off is smaller. Voltage spike stress refers to a power quality problem caused by short-term, high-amplitude voltage fluctuations in a power system, which can adversely affect power equipment and the power system. Spike stress is caused by various factors, such as sudden grid failures, switching operations of power equipment, or transient startup of electrical equipment. The switching off of the second switching unit 12 effectively shuts off the circuit in the equipment. When the second switching unit 12 switches off, the sudden interruption of current in the circuit causes a reverse induced electromotive force (EMF) to be generated in the inductive element (e.g., cable or coil) because the rate of current change is very fast. This leads to the generation of voltage spikes. Simultaneously, because the second switching unit 12 has a larger resistance value, increasing the resistance value of the switch can slow down the rate of sudden current interruption, thereby reducing the amplitude of the reverse induced EMF. This reduces voltage spike stress. A larger switching resistor provides a damping effect, making the current interruption process smoother and slower. Therefore, using the shutdown of the second switching unit 12 with a larger resistance value as the actual shutdown of the circuit can reduce voltage spike stress when the switch is opened, thus protecting the power equipment and ensuring its safe shutdown.
[0048] Please see Figure 1 , Figure 2 and Figure 3In some embodiments, the first signal is a signal issued when the voltage or current of the power equipment exceeds a preset range, or a signal issued when the power equipment receives fault information sent by the host computer. It is understood that the voltage or current of the power equipment exceeding the preset range is a manifestation of equipment malfunction, and a fault signal sent by the host computer is also a manifestation of equipment malfunction. Of course, equipment malfunctions are not limited to these phenomena; overheating, software malfunctions, and component damage are also manifestations of equipment malfunction. When the power equipment detects an equipment malfunction and issues the first signal (the first signal may include multiple instructions that cause the control system to generate different control actions, thereby achieving multiple functions), it can switch the first switch unit 11 from the on state to the off state; after the first switch unit 11 switches to the off state, it controls the second switch unit 12 to switch from the on state to the off state.
[0049] Please see Figure 1 , Figure 2 , Figure 3 , Figure 8 and Figure 9 In some embodiments, the first switching unit 11 includes at least two first switches, which are connected in series or in parallel to form the first switching unit 11. The second switching unit 12 includes at least two second switches, which are connected in series or in parallel to form the second switching unit 12. Multiple first switches and multiple second switches can share a single operating signal. When sending corresponding operating signals to these switches, only one operating signal can be transmitted. That is, multiple first switches and multiple second switches share a single operating signal. Since the first switching unit 11 turns on or off faster than the second switching unit 12 when the first switching unit 11 and the second switching unit 12 receive signals simultaneously, the response speeds of the multiple first switches in the first switching unit 11 and the multiple second switches in the second switching unit 12 to the operating signal are also different. For the same operating signal, multiple first switches can turn on or off simultaneously, and multiple second switches can turn on or off simultaneously. Furthermore, the multiple first switches perform their corresponding actions before the multiple second switches. By using multiple first switches to enable device conduction, the resistance is lower, resulting in less loss during conduction, and also reducing heat generation and lowering heat dissipation costs.
[0050] Please see Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9In some embodiments, the protection method further includes: controlling the first switch unit 11 to switch from an off state to an on state in response to a second signal emitted by the power equipment; and controlling the second switch unit 12 to switch from an off state to an on state after the first switch unit 11 switches from an off state to an on state. After resolving the power equipment malfunction, or when starting up a normal power equipment, the equipment sends a second signal to the switch module 10, causing the originally off switch module 10 to turn on (because the power equipment was originally in a closed state due to the malfunction, and the first switch unit 11 and the second switch unit 12 in its switch module 10 were also in a closed state), allowing the power equipment to start working. Since the response speed of the first switch unit 11 to turn on or off is faster than that of the second switch unit 12, after sending the second signal, the first switch unit 11 turns on first, and the second switch unit 12 turns on later. When the first switch unit 11 turns on, current can pass through the first switch unit 11, thus forming a circuit loop. Therefore, the turn-on of the first switch unit 11 is considered as actual conduction, allowing the equipment to work normally. Because the energy loss of the first switching unit 11 when it is turned on or off is less than that of the second switching unit 12 when it is turned on or off, this method of turning on the switching module 10 and allowing the equipment to work normally reduces energy loss when the switch is on, as well as heat generation and lowers heat dissipation costs.
[0051] Please see Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In some embodiments, the second signal may include multiple instructions, causing the control system to generate different control actions, thereby achieving multiple functions. In some embodiments, the second signal is a signal issued when the voltage or current of the power equipment meets a preset range. It is understood that after resolving the equipment malfunction, the equipment can be restarted. When the corresponding structure on the equipment detects that the voltage or current meets the preset range, it can issue a second signal, or issue a second signal through another structure, so that the first switching unit 11 first switches from the off state to the on state, and then the second switching unit 12 switches from the off state to the on state, forming a circuit and enabling normal operation. The second signal may include multiple instructions, causing the control system to generate different control actions, thereby achieving multiple functions. Of course, the instructions of the second signal are not limited to first switching the first switching unit 11 from the off state to the on state, and then switching the second switching unit 12 from the off state to the on state. After the second switching unit 12 switches from the off state to the on state, there may be other control actions, which can be set as needed.
[0052] Please see Figure 3 , Figure 4 and Figure 5 In some embodiments, after controlling the second switching unit 12 to switch from the off state to the on state, the protection method further includes: controlling the first switching unit 11 to switch from the on state to the off state. The device sends a second signal to the switching module 10, causing the first switching unit 11 to switch from the off state to the on state first, and then causing the second switching unit 12 to switch from the off state to the on state. Afterwards, a shutdown command can be sent to the first switching unit 11 in the switching module 10, causing the first switching unit 11 to switch from the on state to the off state, allowing the current in the circuit to flow through the second switching unit 12. Since the loss of the first switching unit 11 is greater than that of the second switching unit when the circuit is on for a long time, after the circuit is turned on, the first switching unit 11 can be turned off, while the second switching unit 12 continues to operate, without affecting the normal use of the device. This method reduces the loss of the first switching unit 11. Furthermore, the first switching unit 11 is typically a wide-bandgap semiconductor device, while the second switching unit 12 is typically a silicon-based semiconductor device. The cost of the first switching unit 11 is higher than that of the second switching unit 12. Reducing the usage time of the first switching unit 11 can, to some extent, protect the first switching unit 11, extend its service life, and reduce equipment maintenance costs. At the same time, the loss of the first switching unit 11 is reduced. When the first switching unit 11 is a wide-bandgap semiconductor device, a smaller wafer can be used, which also reduces costs to some extent.
[0053] Please see Figure 3 , Figure 4 and Figure 5In some embodiments, after controlling the first switching unit 11 to switch from the on state to the off state, the protection method further includes: responding to a third signal issued by the power equipment, controlling the first switching unit 11 to switch from the off state to the on state. At this time, the first switching unit 11 is turned on with zero voltage, without increasing losses. The third signal is a signal issued by the power equipment when it indicates shutdown. When the power equipment issues the third signal to prepare to stop working, the third signal may contain multiple instructions, which act on the first switching unit 11 and the second switching unit 12 respectively, and control the first switching unit 11 and the second switching unit 12 to switch on and off according to a pre-set program. After the first switching unit 11 switches from the off state to the on state, the second switching unit 12 is controlled to switch from the on state to the off state; after the second switching unit 12 switches from the on state to the off state, the first switching unit 11 is controlled to switch from the on state to the off state. According to the above embodiments, after the first switching unit 11 and the second switching unit 12 are turned on, turning off the first switching unit 11 can reduce the losses of the first switching unit 11 during the operation of the equipment. If the equipment needs to stop working, a third signal can be sent, causing the first switching unit 11 to switch from the off state to the on state. Then, the second switching unit 12 responds to this signal, switching from the on state to the off state. Finally, the first switching unit 11 is turned off. At this point, current cannot flow in the circuit, and the equipment stops working. The turning off of the first switching unit 11 constitutes a substantial shutdown. Since the circuit loss of the first switching unit 11 is less than that of the second switching unit 12, using the first switching unit 11 as the substantial circuit shutdown (i.e., the equipment stops working after the switch is turned off) reduces circuit losses during shutdown, achieving energy savings and reducing heat dissipation, thus lowering the cost of equipment cooling.
[0054] Please see Figure 3 , Figure 6 and Figure 7In some embodiments, the protection method further includes controlling the second switching unit 12 to switch from an on state to an off state in response to a third signal issued by the power equipment. The third signal is the signal issued by the power equipment when indicating a shutdown. After the second switching unit 12 switches from the on state to the off state, the first switching unit 11 is controlled to switch from the on state to the off state. After the equipment is operating normally, both the first switching unit 11 and the second switching unit 12 are in the on state. If it is necessary to stop the equipment from working, the equipment can send a third signal to the second switching unit 12 of the switching module 10, causing the second switching unit 12, which has a slower response speed and higher actual shutdown loss, to switch from the on state to the off state first. After the second switching unit 12 switches to the off state, the first switching unit 11 is then switched from the on state to the off state, and the first switching unit 11 is effectively shut down (i.e., after the first switching unit 11 is shut down, the equipment stops working). Since the loss of the first switching unit 11 when it is actually turned off is less than that of the second switching unit 12 when it is actually turned off, the loss of the switching module 10 can be reduced by turning it off in this way, which can achieve the effect of energy saving, reduce heat dissipation, and reduce the cost of heat dissipation of the equipment.
[0055] Please see Figure 3 In some embodiments, the first switching unit 11 is a wide-bandgap semiconductor device, and the second switching unit 12 is a silicon-based semiconductor device, or the second switching unit 12 is a relay. Wide-bandgap semiconductor devices have low switching losses but high conduction losses and are expensive. Silicon-based semiconductor devices or relays have high switching losses but low conduction losses and are inexpensive. In some low-switching-frequency applications, the above protection method can replace the silicon-based device with a relay or other device to further reduce the constant-current losses and improve the system efficiency. Alternatively, two different wide-bandgap devices can be used in parallel. Although the device cost will increase, the losses from using two wide-bandgap semiconductor devices in parallel are less than the losses from using a wide-bandgap semiconductor device and a silicon-based semiconductor device in parallel. Therefore, in terms of reducing losses, using two wide-bandgap semiconductor devices in parallel can also improve the efficiency of conduction and turn-off.
[0056] Please see Figure 10 A control device 30 for an electrical device is provided on the electrical device. The electrical device also includes a switch module 10 connected to the control device 30. The switch module 10 includes a first switch unit 11 and a second switch unit 12 connected in parallel. The resistance value of the first switch unit 11 is less than the resistance value of the second switch unit 12. The switching speed of the first switch unit 11 is faster than the switching speed of the second switch unit 12. The switching loss of the first switch unit 11 is less than the switching loss of the second switch unit 12.
[0057] The control device 30 is used to respond to a first signal emitted by the power equipment, controlling the first switch unit 11 to switch from an on state to an off state, and after the first switch unit 11 switches to the off state, controlling the second switch unit 12 to switch from an on state to an off state. The control device 30 can be a DSP (Digital Signal Processor). Responding to the first signal emitted by the power equipment, the control device 30 sends a corresponding signal, which can control different switches, allowing the equipment to control different switches to be switched on and off sequentially using the aforementioned usage method. The control device 30 can control the on / off state of the first switch unit 11 as needed, and can also control the on / off state of the second switch unit 12 as needed. The on / off state of the first switch unit 11 and the second switch unit 12 can be freely controlled, as can the order in which they are turned on and off, improving structural flexibility. Since the loss of the first switch unit 11 when it is turned on or off is less than the loss of the second switch unit 12 when it is turned on or off, the loss of the first switch unit 11 is greater than the loss of the second switch unit 12 when it is on for a long time. When the equipment starts up, the control device 30 can control the first switching unit 11 to conduct first, and then control the second switching unit 12 to conduct later, which can reduce the losses during equipment startup. Then, the control device 30 can control the first switching unit 11 to turn off, so that the current only flows through the second switching unit 12, thereby reducing the losses of the equipment during long-term operation. When the equipment is shut down, the control device 30 can control the first switching unit 11 to conduct again, then control the second switching unit 12 to turn off, and then control the first switching unit 11 to turn off again, which can reduce the losses during equipment shutdown.
[0058] Please see Figure 11 In some embodiments, the power equipment further includes a drive unit 20 connected between the control device 30 and the switching module 10. The drive unit 20 can be a drive circuit. The drive unit 20 receives the corresponding control signal from the control device 30 and then converts the corresponding control signal into a drive signal, which is sent to the switching module 10. The drive unit 20 connects the control device 30 and the switching module 10. The control device 30 is responsible for generating appropriate control signals, while the drive unit 20 is responsible for converting the control signals into drive signals suitable for the operation of the switching module 10, eliminating the need for the control device 30 to generate both control and drive signals. This separation of functions simplifies system design and maintenance and improves system reliability and scalability. Simultaneously, the drive unit 20 typically has the function of adapting and amplifying signals. The signal emitted by the control device 30 may need to be adapted and amplified to meet the requirements of the switching module 10. The drive unit 20 can adjust the signal as needed to ensure that parameters such as the signal amplitude, level, and waveform meet the requirements of the switching module 10.
[0059] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0060] The protection method and control device for power equipment provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for protecting electrical equipment, characterized in that, The power equipment includes a switch module (10), which includes a first switch unit (11) and a second switch unit (12) connected in parallel. The resistance value of the first switch unit (11) is less than the resistance value of the second switch unit (12). The protection method includes: In response to a first signal emitted by the power equipment, the first switching unit (11) is controlled to switch from the on state to the off state; After the first switch unit (11) switches to the off state, the second switch unit (12) is controlled to switch from the on state to the off state.
2. The method for protecting power equipment according to claim 1, characterized in that, The first signal is a signal emitted when the voltage or current of the power equipment exceeds a preset range, or a signal emitted when the power equipment receives fault information sent by the host computer.
3. The method for protecting power equipment according to claim 1, characterized in that, The first switching unit (11) includes at least two first switches, which are connected in series or in parallel to form the first switching unit (11). The second switching unit (12) includes at least two second switches, which are connected in series or in parallel to form the second switching unit (12). The multiple first switches and the multiple second switches share a single operating signal.
4. The method for protecting power equipment according to claim 1, characterized in that, The protection method further includes: In response to the second signal emitted by the power equipment, the first switching unit (11) is controlled to switch from the off state to the on state; After the first switch unit (11) switches from the off state to the on state, the second switch unit (12) is controlled to switch from the off state to the on state.
5. The method for protecting power equipment according to claim 4, characterized in that, The second signal is the signal emitted when the voltage or current of the power equipment meets a preset range.
6. The method for protecting power equipment according to claim 4, characterized in that, After controlling the second switching unit (12) to switch from the off state to the on state, the protection method further includes: Control the first switch unit (11) to switch from the on state to the off state.
7. The method for protecting power equipment according to claim 6, characterized in that, After controlling the first switch unit (11) to switch from the on state to the off state, the protection method further includes: In response to a third signal emitted by the power equipment, the first switching unit (11) is controlled to switch from the off state to the on state, wherein the third signal is a signal emitted by the power equipment when it indicates a shutdown. After the first switch unit (11) switches from the off state to the on state, the second switch unit (12) is controlled to switch from the on state to the off state. After the second switch unit (12) switches from the on state to the off state, the first switch unit (11) is controlled to switch from the on state to the off state.
8. The method for protecting power equipment according to claim 4, characterized in that, The protection method further includes: In response to a third signal issued by the power equipment, the second switching unit (12) is controlled to switch from the on state to the off state, wherein the third signal is a signal issued by the power equipment when it indicates a shutdown. After the second switch unit (12) switches from the on state to the off state, the first switch unit (11) is controlled to switch from the on state to the off state.
9. The method for protecting power equipment according to claim 1, characterized in that, The first switching unit (11) is a wide bandgap semiconductor device, the second switching unit (12) is a silicon-based semiconductor device, or the second switching unit (12) is a relay.
10. A control device for power equipment, characterized in that, The power equipment also includes a switch module (10) connected to the control device (30). The switch module (10) includes a first switch unit (11) and a second switch unit (12) connected in parallel. The resistance value of the first switch unit (11) is less than the resistance value of the second switch unit (12). The control device (30) is used to control the first switch unit (11) to switch from the on state to the off state in response to the first signal issued by the power equipment, and after the first switch unit (11) switches to the off state, control the second switch unit (12) to switch from the on state to the off state.
11. The control device for power equipment according to claim 10, characterized in that, The power equipment also includes: A drive unit (20) is connected between the control device (30) and the switch module (10).