Power supply system enabling protection against unexpected power failure

Abstract

The application provides a power supply system capable of realizing unexpected power-off protection, which comprises a power supply module, an input end of the power supply module being connected with a power grid, the power supply module being used for converting alternating current into direct current; a power supply end of a first device and a power supply end of a second device being respectively used for being connected with a direct current bus of the power supply module, wherein when the system is powered off, a motor of the first device rotates in inertia; and when a voltage of the direct current bus is less than a first preset threshold value, a motor driver of the first device is automatically switched from a self-dragging mode to a power generation mode and feedbacks regenerated electric energy to the power supply module, so that the second device normally operates within a preset time length from a self-power-off moment.

Description

Technical Field

[0001] This application relates to the field of power outage protection technology, and in particular to a power supply system that can realize accidental power outage protection. Background Technology

[0002] In industrial production, when a system experiences an unexpected power outage, some critical equipment must continue operating for a predetermined period of time; otherwise, significant economic losses will occur, such as production line paralysis, equipment damage, and workpiece scrapping. Traditional solutions often rely on backup power supplies, but when faced with high-power equipment, the capacity and power density of conventional backup power supplies are insufficient to meet short-term high-load demands, resulting in insufficient operating time or soaring costs. Summary of the Invention

[0003] In view of this, this application provides a power supply system that can realize unexpected power failure protection without increasing hardware costs.

[0004] This application provides a power supply system capable of providing protection against unexpected power outages, comprising:

[0005] A power module, the input of which is connected to the power grid, is used to convert alternating current (AC) to direct current (DC).

[0006] The power supply terminals of the first and second devices are respectively used to connect to the DC bus of the power module, wherein when the system is powered off, the motor of the first device rotates due to inertia; and,

[0007] When the voltage of the DC bus is less than the first preset threshold, the motor driver of the first device automatically switches from self-drive mode to power generation mode and feeds back the regenerated power to the power module, so that the second device can operate normally for a preset period of time from the moment of power failure.

[0008] Optionally, the power supply system includes N power modules of the same specifications, where N≥2, and the DC buses of each power module are connected in parallel.

[0009] Optionally, the power module includes a filtering unit and a rectifier unit, wherein the filtering unit of each power module is connected to the power grid; and the DC buses of each power module are connected in parallel.

[0010] Optionally, the power supply system further includes a first energy storage unit connected to the DC bus; wherein, within a preset time period from the moment of power failure, the first energy storage unit cooperates with the first device to make the voltage of the DC bus greater than the first preset threshold.

[0011] Optionally, the first energy storage device is a capacitor.

[0012] Optionally, when the voltage of the DC bus exceeds the second preset threshold, the power module feeds back to the grid to keep the DC bus voltage within the preset threshold range; or,

[0013] The power supply system further includes a braking resistor; wherein, when the voltage of the DC bus is greater than the second preset threshold, the braking resistor consumes energy on the DC bus to keep the DC bus voltage within the preset threshold range.

[0014] Optionally, the power supply system further includes a voltage conversion module, the input terminal of which is connected to the DC bus, and the voltage conversion module is connected in parallel with the control power supply; wherein, the control power supply is used to provide 24V DC control power to the equipment under normal operating conditions, and the voltage conversion module is used to provide 24V DC control power to the equipment when the system experiences an unexpected power outage.

[0015] Optionally, the power supply system further includes a second power supply connected in parallel with the control power supply; and the control power supply is used to provide 24V DC control power to the equipment under normal operating conditions; when the system experiences an unexpected power outage, the voltage conversion module is used to provide 24V DC control power to critical equipment, and the second power supply is used to provide 24V DC control power to other equipment.

[0016] Optionally, when the motor driver of the first device automatically switches from self-drive mode to generator mode, the motor driver of the first device is configured in torque control mode.

[0017] Optionally, the first device is a spindle drive device and the second device is a hydrostatic device.

[0018] As can be seen from the above technical solution, when the power supply system provided by this application fails to power the system unexpectedly, the motor driver of the first device automatically switches from self-drive mode to power generation mode and feeds the regenerated power back to the DC bus, so that other devices or motors in electric state can directly draw power from it, realizing closed-loop energy conversion control, improving energy utilization, and eliminating the need to equip additional power generation devices. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a power supply system according to an exemplary embodiment of this application.

[0020] Figure 2 This is a schematic diagram of a machining system for heavy workpieces.

[0021] Figure 3 This is a schematic diagram of a power supply system for another exemplary embodiment of this application.

[0022] Figure 4This is a schematic diagram of a power supply system for another exemplary embodiment of this application.

[0023] Figure 5 This is a schematic diagram of an electrical control scheme for an exemplary embodiment of this application.

[0024] List of reference numerals in the attached diagram:

[0025] 11: Power module;

[0026] 111: DC bus;

[0027] AIM: Filtering unit;

[0028] ALM: Rectifier unit;

[0029] 12: First equipment;

[0030] 121: Driver;

[0031] 13: Second equipment;

[0032] 131: Driver;

[0033] 14: Capacitors;

[0034] 15: Voltage conversion module;

[0035] 16: Control power supply;

[0036] 17: Second power source;

[0037] 18: Other equipment;

[0038] 181: Driver;

[0039] 20: Power grid;

[0040] 30: Host controller;

[0041] 40: Lower-level controller;

[0042] 91: Spindle box;

[0043] 92: Workbench;

[0044] 93: Workpiece;

[0045] 94: Claw;

[0046] 95: Top-notch;

[0047] 96: Hydraulic support;

[0048] 97: Oil film;

[0049] M: Motor. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0051] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Where there is no conflict between the embodiments, the following embodiments and features can be combined with each other. The steps in the following method embodiments are for illustrative purposes only and are not intended to limit the invention.

[0052] In industrial production, when a system experiences an unexpected power outage, some critical equipment must continue operating for a predetermined period of time; otherwise, significant economic losses will occur, such as production line paralysis, equipment damage, and workpiece scrapping. Traditional solutions often rely on backup power supplies, but when faced with high-power equipment, the capacity and power density of conventional backup power supplies are insufficient to meet short-term high-load demands, resulting in insufficient operating time or soaring costs.

[0053] Figure 2 A schematic diagram of a machining system for heavy workpieces is shown as an example, in which a spindle drives the rotation of the heavy workpiece. A spindle drive and a hydrostatic device are housed within the spindle housing 91. During workpiece machining, the hydrostatic device provides stable pressure; the hydrostatic pressure can only be released after the workpiece has completely stopped rotating, otherwise the mechanical transmission mechanism within the spindle housing 91 will be damaged. However, if the system experiences a sudden power outage, the workpiece will continue to rotate due to inertia, while the hydrostatic system, due to the power failure, will experience abnormal pressure and be unable to maintain the normal rotation of the workpiece, thereby damaging the mechanical transmission mechanism of the spindle housing 91, ultimately leading to equipment failure or even complete system failure.

[0054] In view of this, this application provides a power supply system that can realize unexpected power failure protection without increasing hardware costs.

[0055] The specific implementation of each embodiment of this application will be described in detail below with reference to the accompanying drawings.

[0056] The power supply system provided in this application includes a power module 11 for converting alternating current (AC) to direct current (DC). For example... Figure 1 As shown, the input terminal of power module 11 is connected to the power grid 20, which is used to convert AC power to DC power. The power terminals of the first device 12 and the second device 13 are respectively connected to the DC bus 111 of the power module 11. The first device 12 is a device that allows the motor to rotate due to inertia when the system is powered off, such as... Figure 2The spindle drive device in the middle; the second device 13 is a device that needs to maintain normal operation for a preset period of time from the moment of power failure, such as Figure 2 The static pressure device in the middle. When the voltage of the DC bus 111 is less than the first preset threshold, the motor driver of the first device 12 automatically switches from self-drive mode to power generation mode and feeds back the regenerated power to the power module 11, so that the second device 13 operates normally for a preset period of time from the moment of power failure.

[0057] The power supply system provided in this application automatically switches the self-drive mode of the motor driver of the first device to the power generation mode when the system is unexpectedly powered off, and feeds the regenerated power back to the DC bus, so that other devices or motors in electric state can directly draw power from it, realizing closed-loop energy conversion control, improving energy utilization, and eliminating the need to equip an additional power generation device.

[0058] For example, the rated voltage of DC bus 111 is 600V, and the first preset threshold is 550V. The first preset threshold is lower than the rated voltage of DC bus 111, which avoids the first device 12 from frequently switching its operating mode due to normal fluctuations in the voltage of DC bus 111.

[0059] by Figure 2 Taking the machining system for heavy workpieces as an example, under normal circumstances, the spindle drive motor drives the workpiece to rotate in a drag mode. When the system experiences an unexpected power outage, the voltage of the DC bus 111 drops rapidly, while the motor of the spindle drive device continues to rotate due to inertia under the influence of the workpiece 93. When the voltage of the DC bus 111 drops below a first preset threshold, the motor driver of the spindle drive device automatically switches from self-driving mode to power generation mode and feeds back regenerated electrical energy to the power module 11, thereby providing a stable power supply for the hydrostatic equipment and enabling the hydrostatic equipment to maintain normal operation for a preset period of time from the moment of power failure. The solution of this application not only achieves efficient energy utilization but also avoids damage to the transmission structure of the spindle box 91 due to the loss of hydrostatic pressure, comprehensively protecting the mechanical structure and ensuring that the equipment can still operate safely and stably in the event of a sudden power outage.

[0060] In one embodiment, the power supply system includes N power modules 11 of the same specifications, where N≥2, and the DC bus 111 of each power module 11 is connected in parallel.

[0061] For example, in Figure 3 In the exemplary embodiment shown, the power supply system includes two identical power modules 11, such as... Figure 3 As shown, the DC buses 111 of the two power modules 11 are connected in parallel.

[0062] In this embodiment, by connecting multiple power modules 11 in parallel, the total output power of the entire power system can be increased. Furthermore, if one power module 11 fails, the other functioning power modules 11 can continue to supply power to the load, thereby improving the reliability and availability of the entire power system. Moreover, the parallel-connected power modules 11 can achieve automatic load balancing; that is, each power module 11 will share the load current according to its own capacity and performance in a certain proportion, ensuring that the output power of each module is basically equal, avoiding a situation where one module is overloaded while other modules are underloaded.

[0063] In one embodiment, the power module 11 includes a filtering unit and a rectifier unit, wherein the filtering unit of each power module 11 is connected to the power grid 20; and the DC buses 111 of each power module 11 are connected in parallel, such as... Figure 4 As shown.

[0064] by Figure 2 Taking the machining system for heavy workpieces as an example, its power supply system includes two identical power modules 11, each of which includes a filter unit AIM and a rectifier unit ALM. Figure 4 As shown, the filter unit AIM of each power module 11 is connected to the power grid 20, and the DC bus 111 of the two power modules 11 is connected in parallel. The static pressure device and the spindle drive device are respectively connected to the DC bus 111. Figure 4 As shown, the rectifier unit ALM of each power module 11 is communicatively connected to the lower controller 40 (such as a PLC) to synchronously receive control signals and synchronously execute control commands.

[0065] In some embodiments, the power supply system further includes a first energy storage unit connected to the DC bus 111, such as... Figure 5 As shown. Within a preset time period from the moment of power failure, the first energy storage unit, in conjunction with the first device 12, ensures that the voltage of the DC bus 111 is greater than the first preset threshold.

[0066] In some embodiments, the first energy storage device is a capacitor 14. When the voltage of the DC bus 111 is less than a first preset threshold, the capacitor 14 discharges to make the voltage of the DC bus 111 greater than the first preset threshold.

[0067] In some implementations, when the voltage of the DC bus 111 is greater than the second preset threshold, the power module 11 feeds back electrical energy to the power grid 20 to keep the voltage of the DC bus 111 within the preset threshold range.

[0068] In other embodiments, the power supply system further includes a braking resistor; wherein, when the voltage of the DC bus 111 is greater than the second preset threshold, the braking resistor consumes energy on the DC bus 111 to keep the voltage of the DC bus 111 within the preset threshold range.

[0069] For example, the voltage rating of DC bus 111 is 600V, and the second preset threshold is 650V.

[0070] If excessive regenerated energy causes the DC bus 111 voltage to exceed the safe range, the electrical equipment will activate a protection mechanism to cut off the power supply. To solve this problem, this embodiment uses the power module 11 to invert the excess energy into AC power that meets the requirements of the power grid 20 and feed it back to the power grid 20, or uses a resistor to dissipate the excess energy as heat, thereby keeping the DC bus 111 voltage within a preset threshold range and ensuring stable operation and rational energy utilization of the DC bus 111 under various operating conditions.

[0071] In some embodiments, the power supply system further includes a voltage conversion module 15, the input of which is connected to the DC bus 111, for converting the DC bus voltage into a DC control voltage. For example... Figure 5 As shown, the voltage conversion module 15 is connected in parallel with the control power supply 16. Under normal operating conditions, the control power supply 16 provides 24V DC control power to the equipment; when the system experiences an unexpected power outage, the voltage conversion module 15 provides 24V DC control power to the equipment.

[0072] The control power supply 16 provides 24V DC control power to devices such as controllers, sensors, drivers, and motors. In the event of an unexpected power outage, some critical electrical equipment needs to continue operating, for example... Figure 5 The lower-level controller 40, the first device, the second device, etc. are included. In this embodiment, the voltage of the DC bus 111 is converted to 24V voltage through the voltage conversion module 15, so as to continuously supply power to the 24V critical electrical equipment for a preset period of time from the time of power failure.

[0073] In some embodiments, the power supply system further includes a second power supply 17 connected in parallel with the control power supply 16; and the control power supply 16 is used to provide 24V DC control power to the equipment under normal operating conditions; when the system experiences an unexpected power outage, the voltage conversion module 15 is used to provide 24V DC control power to critical equipment, and the second power supply is used to provide 24V DC control power to other equipment, wherein the critical equipment is equipment that needs to maintain normal 24V power supply for a preset period of time from the moment of power outage.

[0074] Furthermore, the output terminal of the control power supply 16 is equipped with a reverse current protection device. When the system is unexpectedly powered off and supplied by the second power supply or voltage conversion module, the reverse current protection device can prevent current from flowing back to the control power supply 16, thereby protecting the power supply, load or related circuits from damage.

[0075] In some implementations, the second power source is a UPS (Uninterruptible Power Supply).

[0076] In some implementations, when the motor driver of the first device automatically switches from self-drive mode to generator mode, the motor driver of the first device 12 is configured in torque control mode. Torque limiting in torque control mode effectively prevents mechanical overload.

[0077] Figure 5 for Figure 2 This is a schematic diagram of the electrical control scheme for the machining system. Solid black lines represent the DC bus 111, dashed lines represent the 24V control power line, and dotted lines represent the bus. The first device 12 is the spindle drive device, and the second device 13 is the static pressure device. The host controller 30 is connected to each device via the bus. The DC bus 111 provides 600V power to each electrical device / app, and the control power supply 16 provides 24V DC control power to the devices under normal operating conditions. This embodiment includes two parallel power modules 11, so if one power module 11 fails, the other power module 11 can continue to supply power to the load. When the system experiences an unexpected power outage, capacitor 14, in conjunction with the spindle drive device, ensures that the voltage of the DC bus 111 exceeds a first preset threshold. Figure 5 As shown, the voltage conversion module 15, the second power supply 17, and the control power supply 16 are connected in parallel. Under normal operating conditions, the control power supply 16 provides 24V DC control power to the equipment; when the system experiences an unexpected power outage, the voltage conversion module 15 provides 24V DC control power to critical equipment, and the second power supply provides 24V DC control power to other equipment, thus providing a stable power supply to the equipment during a power outage.

[0078] In this patent application, nouns and pronouns relating to people are not limited to specific genders.

[0079] The present invention has been shown and described in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above multiple embodiments, those skilled in the art will know that more embodiments of the present invention can be obtained by combining the code review methods in the different embodiments above. These embodiments are also within the protection scope of the present invention.

Claims

1. A power supply system capable of providing protection against unexpected power outages, characterized in that, include: A power module (11) is connected to the power grid (20) at its input end. The power module (11) is used to convert AC power into DC power. The power supply terminals of the first device (12) and the second device (13) are respectively used to connect to the DC bus (111) of the power module (11), wherein, when the system is powered off, the motor of the first device (12) rotates due to inertia; and, When the voltage of the DC bus (111) is less than the first preset threshold, the motor driver of the first device (12) automatically switches from self-drive mode to power generation mode and feeds back the regenerated power to the power module (11), so that the second device (13) operates normally within a preset time period from the moment of power failure.

2. The power supply system capable of providing protection against unexpected power outages as described in claim 1, characterized in that, The power supply system includes N power modules (11) of the same specifications, where N≥2, and the DC bus (111) of each power module (11) is connected in parallel.

3. The power supply system capable of providing protection against unexpected power outages as described in claim 2, characterized in that, The power module (11) includes a filter unit and a rectifier unit, wherein the filter unit of each power module (11) is connected to the power grid (20); and the DC bus (111) of each power module (11) is connected in parallel.

4. The power supply system capable of providing protection against unexpected power outages as described in any one of claims 1-3, characterized in that, The power supply system further includes a first energy storage unit, which is connected to the DC bus (111); wherein, within a preset time period from the moment of power failure, the first energy storage unit cooperates with the first device (12) to make the voltage of the DC bus (111) greater than the first preset threshold.

5. The power supply system capable of providing protection against unexpected power outages as described in claim 4, characterized in that, The first energy storage unit is a capacitor (14).

6. The power supply system capable of providing protection against unexpected power outages as described in claim 4, characterized in that, When the voltage of the DC bus (111) is greater than the second preset threshold, the power module (11) feeds back to the power grid (20) to keep the voltage of the DC bus (111) within the preset threshold range; or, The power supply system further includes a braking resistor; wherein, when the voltage of the DC bus (111) is greater than a second preset threshold, the braking resistor consumes energy on the DC bus (111) to keep the voltage of the DC bus (111) within the preset threshold range.

7. The power supply system capable of providing protection against unexpected power outages as described in claim 2, characterized in that, The power supply system also includes a voltage conversion module (15), the input terminal of which is connected to the DC bus (111), and the voltage conversion module (15) is connected in parallel with the control power supply (16); wherein, the control power supply (16) is used to provide 24V DC control power to the equipment under normal operating conditions, and the voltage conversion module (15) is used to provide 24V DC control power to the equipment when the system is unexpectedly powered off.

8. The power supply system capable of providing protection against unexpected power outages as described in claim 7, characterized in that, The power supply system also includes a second power supply, which is connected in parallel with the control power supply (16); and the control power supply (16) is used to provide 24V DC control power to the equipment under normal operating conditions; when the system is unexpectedly powered off, the voltage conversion module (15) is used to provide 24V DC control power to the critical equipment, and the second power supply is used to provide 24V DC control power to the equipment other than the critical equipment.

9. The power supply system capable of providing protection against unexpected power outages as described in claim 2, characterized in that, When the motor driver of the first device (12) automatically switches from self-drive mode to power generation mode, the motor driver of the first device (12) is configured to torque control mode.

10. A power supply system capable of providing protection against unexpected power outages as described in any one of claims 1-9, characterized in that, The first device (12) is a spindle drive device and the second device (13) is a hydrostatic device.

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