A power supply device

Abstract

The application provides a power supply device applied to the field of power electronics to more reliably remove ice on the contact points of an electromagnetic switch without changing the electromagnetic switch structure in the power supply device. The power supply device comprises a power conversion circuit, an adjustable voltage driving circuit and an electromagnetic switch, the electromagnetic switch being connected to the input end or the output end of the power conversion circuit. The adjustable voltage driving circuit is connected to the electromagnetic coil of the electromagnetic switch, and the adjustable voltage driving circuit is used to output a first driving voltage to the electromagnetic coil when the temperature of the contact pin of the electromagnetic switch is less than a first temperature threshold, the first driving voltage being greater than the rated voltage of the electromagnetic switch. Based on this, the voltage across the electromagnetic coil can be actively increased by the adjustable voltage driving circuit without changing the structure of the electromagnetic switch, so that the electromagnetic coil can quickly heat up, thereby increasing the temperature inside the electromagnetic switch and more quickly removing the ice on the contact points.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more particularly to a power supply device. Background Technology

[0002] Electromagnetic switches are commonly used devices in various equipment such as charging piles, electric vehicles, and power supplies. When in use, an electromagnetic switch requires a voltage driving circuit to apply a certain driving voltage to the two ends of the electromagnetic coil inside the switch. This causes the magnetic core wrapped in the coil to generate magnetic force, which in turn drives the armature to move, making contact between the moving and stationary contacts on the armature, ensuring the normal operation of the circuit. In environments with high humidity and low temperature, the contacts of electromagnetic switches are prone to icing, leading to malfunctions in the entire circuit. Some related technologies typically use repeated switching of the electromagnetic switch to knock off the ice layer to remove it from the contacts, or add an additional de-icing device inside the electromagnetic switch. However, these solutions are costly and have poor de-icing efficiency. Therefore, there is an urgent need to provide a solution to address these problems. Summary of the Invention

[0003] This application provides a power supply device that can more reliably remove ice from contacts without changing the electromagnetic switch structure in the power supply device.

[0004] To achieve the above objectives, the embodiments of this application provide the following technical solutions.

[0005] This application provides a power supply device, which includes a power conversion circuit, an adjustable voltage drive circuit, and an electromagnetic switch. The electromagnetic switch is connected to the input or output terminal of the power conversion circuit, and the adjustable voltage drive circuit is connected to the electromagnetic coil of the electromagnetic switch. The adjustable voltage drive circuit is used to output a first drive voltage to the electromagnetic coil when the temperature of the contact pins of the electromagnetic switch is lower than a first temperature threshold. The first drive voltage is greater than the rated voltage of the electromagnetic switch.

[0006] In the above technical solution, if the temperature of the contact pins of the electromagnetic switch is lower than the first temperature threshold, it indicates that there is a risk of ice formation on the contacts of the electromagnetic switch. At this time, the adjustable voltage drive circuit outputs a drive voltage greater than the rated voltage to the electromagnetic coil of the electromagnetic switch, which can increase the heat generation of the electromagnetic coil, thereby raising the internal temperature of the electromagnetic switch and removing the ice layer on the contacts without changing the structure of the electromagnetic switch.

[0007] In one embodiment, when the power conversion circuit is not in operation, the adjustable voltage drive circuit is further configured to stop outputting the first drive voltage to the electromagnetic coil when the temperature of the contact pin of the electromagnetic switch rises to a second temperature threshold. The second temperature threshold is greater than the first temperature threshold and is greater than 10°C.

[0008] In the above technical solution, under low temperature and high humidity conditions, the temperature of the contact pins of the electromagnetic switch rising to the second temperature threshold indicates that the ice layer on the contacts has melted and the current temperature of the contacts will not cause them to freeze again. At this time, the adjustable voltage drive circuit stops outputting the first drive voltage to the electromagnetic coil, which can reduce the power consumption of the electromagnetic coil.

[0009] In one embodiment, the first driving voltage is less than the upper limit operating voltage of the electromagnetic switch.

[0010] When the adjustable voltage drive circuit outputs a first drive voltage to the electromagnetic coil of the electromagnetic switch, if the voltage of the first drive voltage exceeds the upper limit operating voltage of the electromagnetic switch, the electromagnetic coil will overheat, thereby burning out the electromagnetic coil and causing the electromagnetic switch to fail. In this embodiment, the first drive voltage being lower than the upper limit operating voltage of the electromagnetic switch can prevent electromagnetic switch failure while de-icing the contacts.

[0011] In one embodiment, when the power conversion circuit is in operation, the adjustable voltage drive circuit is further configured to: stop outputting the first drive voltage to the electromagnetic coil and output the rated voltage to the electromagnetic coil when the current at the contact pin is greater than the current threshold.

[0012] In the above technical solution, when the power conversion circuit is in operation, a current at the contact pins greater than the current threshold indicates that the electromagnetic switch can conduct normally and is in operation. At this time, reducing the voltage across the electromagnetic coil to the rated voltage of the electromagnetic switch can prevent excessive heat generation from affecting the lifespan of the electromagnetic coil, and can also reduce the power consumption of the electromagnetic coil.

[0013] In one embodiment, when the duration of continuous output of the first driving voltage exceeds a duration threshold, the adjustable voltage driving circuit stops outputting the first driving voltage to the electromagnetic coil.

[0014] In the above technical solution, when the adjustable voltage drive circuit increases the drive voltage across the electromagnetic coil to de-ice the contacts, it can control the heating duration of the electromagnetic coil during de-icing. This reduces the power consumption of the electromagnetic coil and avoids applying a large voltage across the electromagnetic coil for a long time, which could affect the service life of the electromagnetic coil.

[0015] In one embodiment, the first temperature threshold is greater than -5°C and less than or equal to 0°C. When the temperature of the contact pins of the electromagnetic switch is greater than -5°C and less than or equal to 0°C, the contacts will freeze. At this time, the adjustable voltage drive circuit outputs the first drive voltage to the electromagnetic coil to promptly defrost the contacts and avoid affecting the normal operation of the electromagnetic switch.

[0016] In one embodiment, the charging pile further includes a temperature sensor connected to an adjustable voltage drive circuit, the temperature sensor being used to detect the temperature of the contact pins of the electromagnetic switch.

[0017] In the above technical solution, the temperature of the contact pins of the electromagnetic switch can be directly detected by a temperature sensor, which allows for more accurate control of the contact temperature without changing the structure of the electromagnetic switch, thereby improving the de-icing effect. Attached Figure Description

[0018] Figure 1 A schematic diagram of a charging pile provided in an embodiment of this application;

[0019] Figure 2 Another schematic diagram of a charging pile provided in an embodiment of this application;

[0020] Figure 3 A schematic diagram of a power supply device provided in an embodiment of this application;

[0021] Figure 4 A schematic diagram of the structure of an electromagnetic switch provided in an embodiment of this application;

[0022] Figure 5 Another schematic diagram of a charging pile provided in an embodiment of this application;

[0023] Figure 6 Another schematic diagram of the power supply equipment provided in the embodiments of this application. Detailed Implementation

[0024] The following sections will discuss the fabrication and use of various embodiments in detail. However, it should be understood that many applicable inventive concepts provided in this application can be implemented in a variety of specific environments. The specific embodiments discussed are merely illustrative of specific ways of implementing and using this application and technology, and do not limit the scope of this application.

[0025] Unless otherwise defined, all technical terms used herein have the same meaning as commonly known to one of ordinary skill in the art.

[0026] Each circuit or other component may be described or referred to as "for" performing one or more tasks. In this context, "for" is used to imply a structure by indicating that the circuit / component includes a structure (e.g., a circuit system) that performs one or more tasks during operation. Therefore, even when the specified circuit / component is currently inoperable (e.g., not turned on), it can still be referred to as "for performing that task." Circuits / components used with the term "for" include hardware, such as circuits that perform operations.

[0027] The embodiments of this application use terms such as "first" and "second" to distinguish objects with similar names, functions, or roles. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order.

[0028] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0029] Before introducing the embodiments of this application, the application scenarios involved in this application will be introduced first.

[0030] Figure 1 This is a schematic diagram of a charging pile provided in an embodiment of this application. Figure 1 As shown, the charging pile 100 includes a power supply interface 110, a power conversion circuit 120, a first control circuit 130, and a charging gun 140. The power conversion circuit 120 is connected to both the power supply interface 110 and the charging gun 130. The power supply interface 110 is used to connect to the power grid, while the charging gun 140 is used to connect to the charging port of an electric vehicle. The first control circuit 130 controls the power conversion circuit 120 to receive AC power from the power supply interface 110 and convert it into DC power, which is then used to charge the electric vehicle through the charging gun 140.

[0031] In one embodiment, to promptly disconnect the power conversion circuit 120 from the power supply interface 110 in the event of a charging pile 100 malfunction, a circuit breaker 150 is typically installed between the power supply interface 110 and the power conversion circuit 120. Additionally, to stop the output of power to the electric vehicle when the charging pile 100 malfunctions or after charging is complete, a control switch 160 is also installed between the power conversion circuit 120 and the charging gun 140. Correspondingly, the charging pile 100 includes a first voltage drive circuit 170, which can be connected to a first control circuit 130. The first voltage drive circuit 170 is used to control the circuit breaker 150 and the control switch 160 to open and close. For example, when the charging pile 100 is operating normally, after the charging gun 140 is connected to the charging interface of the electric vehicle, the first control circuit 130 can control the first voltage drive circuit 170 to drive the control switch 160 to open according to the user-input charging command. When a fault occurs in the charging pile 100, the first control circuit 130 can control the first voltage drive circuit 170 to drive the control switch 160 and the circuit breaker 150 to shut down according to the received fault indication signal.

[0032] In one embodiment, the first voltage drive circuit 170 and the first control circuit 130 are different modules within the same controller. Alternatively, the first voltage drive circuit 170 and the first control circuit 130 are modules within two independent controllers. The controller can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits or devices, and this application is not limiting.

[0033] Figure 2 Another schematic diagram of a charging pile provided in an embodiment of this application. In one embodiment, as shown... Figure 2 As shown, the charging pile 100 includes multiple selector switches 180 and multiple power conversion circuits 120. The input terminal of each power conversion circuit 120 is connected to the power supply interface 110 via a circuit breaker 150. One end of each selector switch 180 is connected to the output terminal of a corresponding power conversion circuit 120, and the other end of each selector switch 180 is connected to the charging gun 140 via the aforementioned control switch 160. When charging an electric vehicle, the first control circuit 130 can control one or more selector switches 180 to be turned on according to the charging power of the electric vehicle, thereby providing the charging power required for the electric vehicle through one or more power conversion circuits 120.

[0034] The power conversion circuit 120 mentioned above includes, but is not limited to, an alternating current-direct current (AC-DC) conversion circuit, a direct current-direct current (DC-DC) conversion circuit, a voltage regulator circuit, and a filter circuit.

[0035] In the charging pile 100, the circuit breaker 150, control switch 160, and selector switch 180 mentioned above are typically electromagnetic switches, such as electromagnetic relays or electromagnetic contactors. Among them, electromagnetic relays have become the mainstream choice due to their advantages such as high reliability, fast response speed, small size, large load capacity, and low cost.

[0036] Besides the circuit breaker 150, control switch 160, and selector switch 180 in the charging pile 100, which typically use electromagnetic switches 320, electromagnetic switches 320 are also used in many power supply devices for circuit on / off control. These power supply devices can include inverters, communication power supplies, charging modules, vehicle power supplies, and uninterruptible power supplies (UPS), etc.

[0037] Figure 3 This is a schematic diagram of a power supply device provided in an embodiment of this application. Figure 3 The power supply device 300 shown includes an input port 310, a power conversion circuit 120, an electromagnetic switch 320, an output port 330, a second control circuit 340, and a second voltage drive circuit 350. The input port 310 is used to connect electrical equipment. The input terminal of the power conversion circuit 120 is connected to the input port 310. One contact pin of the electromagnetic switch 320 is connected to the output terminal of the power conversion circuit 120, and the other contact pin of the electromagnetic switch 320 is connected to the output port 330. The second voltage drive circuit 350 is connected to the electromagnetic coil 324 of the electromagnetic switch 320. The second control circuit 340 is connected to the second voltage drive circuit 350.

[0038] The second voltage drive circuit 350 outputs a drive voltage to the electromagnetic coil 324 according to the control command sent by the second control circuit 340, so as to turn the electromagnetic switch 320 on or off. Specifically, when the electromagnetic switch 320 needs to be turned on, the second voltage drive circuit 350 outputs the rated voltage of the electromagnetic switch 320 to the electromagnetic coil 324. When the electromagnetic switch 320 needs to be turned off, the drive voltage output by the second voltage drive circuit 350 to the electromagnetic coil 324 is zero.

[0039] Figure 4 This is a schematic diagram of an electromagnetic switch provided in an embodiment of this application. Figure 4As shown, the electromagnetic switch 320 includes a housing 321, a base 322a, a support rod 322b, a rotating rod 322c, a spring 323, an electromagnetic coil 324, a magnetic core 325, an armature 326, a moving contact 327, a stationary contact 328, and contact leads 329. The base 322a, support rod 322b, rotating rod 322c, electromagnetic coil 324, magnetic core 325, armature 326, moving contact 327, and stationary contact 328 are all enclosed within the housing 321. One end of the support rod 322b is fixed to the base 322a, and the other end of the support rod 322b is rotatably connected to the rotating rod 322c. One end of the spring 323 is connected to the base 322a and close to one end of the support rod 322b, and the other end of the spring 323 is connected to one end of the rotating rod 322c. The other end of the rotating rod 322c is connected to the armature 326. The moving contact 327 is mounted on the end of the armature 326 away from the rotating rod 322c and is connected to one of the pins of the contact pin 329. The stationary contact 328 is positioned opposite the moving contact 327 and is connected to the other pin of the contact pin 329. The contact pin 329 passes through the housing 321 and is fixedly connected to the housing 321. The electromagnetic coil 324 is wound around the magnetic core 325. The electromagnetic coil 324 and the magnetic core 325 are fixed on the base 322a and located between the armature 326 and the base 322a. When the electromagnetic coil 324 is energized, it generates a magnetic force on the magnetic core 325, causing the armature 326 to move towards the magnetic core 325. This causes the moving contact 327 on the armature 326 to contact and engage with the stationary contact 328, thus completing the circuit connected by the two contact pins 329.

[0040] It should be understood that the structure of the electromagnetic switch 320 described above is merely an exemplary structure provided in this application embodiment for the purpose of facilitating understanding of the principle of the electromagnetic switch 320. In specific implementations, the electromagnetic switch 320 structure selected can be any commonly used structure, and this application embodiment does not impose any specific limitations on it.

[0041] In practical applications, the contact pins 329 of the electromagnetic switch 320 are typically fixed to the circuit board 400. When the electromagnetic switch 320 is in operation, a large current usually flows through the contacts, causing the contact pins 329 and the air inside the housing 321 of the electromagnetic switch 320 to heat up, resulting in an increase in the temperature of both the air inside the housing 321 and the contacts. When the electromagnetic switch 320 stops working and cools down, the moving contact 327 and the stationary contact 328 of the electromagnetic switch 320 are directly connected to (or integrated with) the contact pins 329, and thus dissipate heat quickly through the circuit board 400. However, the air temperature inside the housing 321 can only be dissipated through heat exchange with the housing 321. This process results in the contacts cooling down quickly while the temperature inside the housing 321 cools down slowly. During the cooling process, water vapor in the air will first condense on the contact surface, and after the air temperature has completely decreased, an ice layer will form on the contact surface. When the device is reused at low temperatures, the moving contact 327 and the stationary contact 328 will be engaged. However, due to the ice layer adhering to their surfaces, the impedance of the corresponding circuit will increase, which will affect the normal operation of the electromagnetic switch 320. In severe cases, it may cause other parts of the circuit to malfunction or the devices to fail.

[0042] In one embodiment, a temperature sensor 410 may also be provided on the circuit board 400. The temperature sensor 410 is located near the contact pin 329 and is used to detect the temperature of the contact pin 329.

[0043] To defrost the contacts, some related technologies involve rapidly switching the electromagnetic switch 320 on and off multiple times to cause the moving contact 327 to repeatedly strike the stationary contact 328, thereby breaking up the ice layer. However, the de-icing efficiency of this method is relatively low. Some related technologies add a heating device inside the electromagnetic switch 320 to melt the ice. However, this method requires modifying the structure of the electromagnetic switch 320, increasing additional costs.

[0044] To address the aforementioned issues, this application provides a charging pile 100 with contact de-icing functionality.

[0045] Figure 5 This is another schematic diagram of a charging pile provided in an embodiment of this application. The charging pile 100 provided in this embodiment includes an adjustable voltage drive circuit 510 and an electromagnetic switch 320 mounted on a circuit board 400. The adjustable voltage drive circuit 510 is connected to the electromagnetic coil 324 of the electromagnetic switch 320. One contact pin 329 of the electromagnetic switch 320 is used for input current, and the other contact pin 329 of the electromagnetic switch 320 is used for output current. For example, still as... Figure 5As shown, one contact pin 329 of the electromagnetic switch 320 is connected to the power supply interface 110, and the other contact pin 329 of the electromagnetic switch 320 is connected to the input terminal of the power conversion circuit 120. The output terminal of the power conversion circuit 120 is connected to the charging gun 140 through the control switch 160.

[0046] Upon receiving a first command, the adjustable voltage drive circuit 510 outputs the rated voltage of the electromagnetic switch 320 to the electromagnetic coil 324 of the electromagnetic switch 320, thereby turning on the electromagnetic switch 320. The first command indicates that the electromagnetic switch 320 is turned on. Upon receiving a second command, the adjustable voltage drive circuit 510 reduces the output drive voltage to zero, thereby turning off the electromagnetic switch 320. The second command indicates that the electromagnetic switch 320 is turned off. Furthermore, the adjustable voltage drive circuit 510 can also output a first drive voltage to the electromagnetic coil 324 when the temperature of the contact pin 329 of the electromagnetic switch 320 is below a first temperature threshold. This first drive voltage is greater than the rated voltage of the electromagnetic switch 320.

[0047] In the above scheme, the resistance R of the electromagnetic coil 324 inside the electromagnetic switch 320 is usually a fixed value. According to Ohm's law, the larger the voltage U across the electromagnetic coil 324, the greater the power P it consumes.

[0048] P = U 2 / R;

[0049] Furthermore, according to the specific heat capacity formula, the temperature rise ΔT of a substance is directly proportional to its power P.

[0050] Q = c * m * ΔT = P * Δt;

[0051] Where Q is the energy of the substance, c is the specific heat capacity of the substance, m is the mass of the substance, and Δt is the cumulative time.

[0052] Therefore, the heat generated by the electromagnetic coil 324 can be increased by increasing the voltage across the two ends of the electromagnetic coil 324, so that the electromagnetic coil 324 can act as a heat source inside the electromagnetic switch 320 to heat the surrounding air and melt the ice layer at the contact.

[0053] In this embodiment, if the temperature of the contact pin 329 of the electromagnetic switch 320 is lower than the first temperature threshold, it indicates that the temperature of the contact pin 329 is very low, which can easily cause the moving contact 327 and / or the stationary contact 328 to freeze. At this time, the adjustable voltage drive circuit 510 actively controls the drive voltage of the electromagnetic coil 324 of the electromagnetic switch 320 to be greater than the rated voltage of the electromagnetic switch 320, so that the electromagnetic coil 324 can heat up faster, thereby quickly increasing the internal temperature of the electromagnetic switch 320, melting the ice layer on the moving contact 327 and the stationary contact 328 in time, and ensuring that the electromagnetic switch 320 can operate normally.

[0054] In the above embodiment, the first driving voltage is less than the upper limit operating voltage of the electromagnetic switch 320. Based on this, by increasing the driving voltage of the electromagnetic coil 324 to de-ice the contacts, it is possible to prevent the electromagnetic coil 324 from overheating and burning out, thus enabling the electromagnetic switch to operate more reliably.

[0055] In low-temperature and high-humidity environments, when the temperature of contact pin 329 is below 0°C, there is a risk of icing on the contact surface. The lower the contact temperature, the faster the icing occurs and the more severe the impact of icing. This means that the heating time of the electromagnetic coil 324 needs to be longer during defrosting to effectively melt the ice layer, resulting in greater energy loss.

[0056] In one embodiment, the first temperature threshold is greater than -5°C and less than or equal to 0°C. For example, when the temperature of the contact pin 329 of the electromagnetic switch 320 is less than 0°C, the adjustable voltage drive circuit 510 actively controls the drive voltage of the electromagnetic coil 324 of the electromagnetic switch 320 to a first drive voltage greater than the rated voltage of the electromagnetic switch 320, so that the ice layer on the contact can melt faster.

[0057] In this way, when the temperature of the contact pin 329 may cause the contact to freeze, the adjustable voltage drive circuit 510 can promptly heat up the electromagnetic coil 324 by outputting the first drive voltage, thereby removing the ice layer from the contact in time.

[0058] It should be understood that the range of the first temperature threshold mentioned above is only an exemplary implementation provided in this application embodiment. In specific implementations, the first temperature threshold needs to be set according to the actual usage environment of the electromagnetic switch 320 and the model of the electromagnetic switch 320, and this application embodiment does not impose specific limitations in this regard.

[0059] Furthermore, because the type of electromagnetic switch 320 may differ in actual application scenarios, the voltage value of the first driving voltage of the electromagnetic switch 320 will also vary. In specific implementation, technicians can calibrate the voltage value of the first driving voltage of the electromagnetic switch 320 currently in use. Then, during subsequent use, when the temperature of the contact pins of the electromagnetic switch is lower than the first temperature threshold, the adjustable voltage drive circuit 510 directly outputs the calibrated voltage value to ensure that the electromagnetic coil 324 heats up promptly. Simultaneously, controlling the heating of the electromagnetic coil 324 by using the calibrated voltage value also prevents excessively high voltage across the electromagnetic coil 324 from burning it out.

[0060] In practical applications, the ambient temperature of the environment where the electromagnetic switch 320 is located may gradually increase during the day. As the ambient temperature rises, the temperature of the contact pins of the electromagnetic switch 320 will also increase. However, even when the temperature of the contact pins rises to a relatively high level with the ambient temperature, there is no risk of the contacts of the electromagnetic switch 320 freezing. At this point, if the adjustable voltage drive circuit 510 continues to output the first drive voltage, it will increase the power consumption of the electromagnetic switch 320.

[0061] In one embodiment, when the electromagnetic switch 320 is not in operation, the adjustable voltage drive circuit 510 stops outputting the first drive voltage to the electromagnetic coil 324 when the temperature of the contact pins of the electromagnetic switch 320 rises to a second temperature threshold. The second temperature threshold is greater than the first temperature threshold and is greater than 10°C.

[0062] In the above implementation process, when the electromagnetic switch 320 is not in operation, the temperature of the contact pin 329 of the electromagnetic switch 320 rising to the second temperature threshold indicates that the ice layer on the contact has melted and there is no risk of the contact freezing at the current temperature. At this time, the adjustable voltage drive circuit 510 stops outputting the first drive voltage to the electromagnetic coil 324, which can reduce the power consumption of the electromagnetic coil 324, and also reduce the heat loss of the electromagnetic coil 324, thereby improving the service life of the electromagnetic switch 320.

[0063] In the above embodiments, the range of the second temperature threshold is merely an exemplary implementation provided in this application. The specific implementation of the second temperature threshold also needs to be set according to the actual operating environment of the electromagnetic switch 320 and the specific model of the electromagnetic switch 320; this application does not impose specific limitations in this regard.

[0064] After the adjustable voltage drive circuit 510 outputs the first drive voltage to the electromagnetic coil 324, the ice layer on the contact pins 329 of the electromagnetic switch 320 will gradually melt when the temperature is above 0°C. The higher the temperature of the contact pins 329, the faster the ice layer melts. However, excessively high temperatures of the contact pins 329 will increase the power consumption of the electromagnetic coil 324, accelerate its aging process, and may even burn out the electromagnetic coil 324.

[0065] In one embodiment, when the adjustable voltage drive circuit 510 outputs a first drive voltage to make the electromagnetic coil 324 heat up faster, the temperature of the contact pins of the electromagnetic coil 324 after heating up is greater than 0°C and less than or equal to 10°C. For example, after the electromagnetic coil 324 is heated by the first drive voltage, the temperature of the contact pins 329 of the electromagnetic switch 320 is 5°C.

[0066] Based on this, while de-icing the contacts, it is possible to avoid continuing to heat the electromagnetic coil 324 when the ambient temperature is high, thus preventing an increase in the power consumption of the electromagnetic coil 324.

[0067] In the above embodiments, when the electromagnetic coil 324 is heated by the first driving voltage, the first driving voltage can be calibrated according to the temperature required to be reached after the electromagnetic coil 324 is heated. This will not be elaborated on in the embodiments of this application.

[0068] In one embodiment, when the power conversion circuit is in operation, the adjustable voltage drive circuit 510 stops outputting the first drive voltage to the electromagnetic coil 324 and outputs the rated voltage of the electromagnetic coil 324 to the electromagnetic coil 324 when the current at the contact pin is greater than the current threshold.

[0069] In the above embodiment, if the current at the contact pin 329 is greater than the current threshold, it indicates that the power conversion circuit 120 connected to the contact pin 329 of the electromagnetic switch 320 is in operation when the electromagnetic switch 320 is turned on. At this time, if the adjustable voltage drive circuit 510 continues to output the first drive voltage, the electromagnetic coil 324 will overheat, increasing the loss of the electromagnetic coil 324, accelerating the aging rate of the electromagnetic coil 324, and affecting the service life of the electromagnetic coil 324.

[0070] In this embodiment, the adjustable voltage driving circuit 510 actively stops outputting the first driving voltage when the current at the contact pin 329 is greater than the current threshold. This can reduce the loss of the electromagnetic coil 324 while ensuring the melting of the ice layer at the contact, thereby reducing the impact on the service life of the electromagnetic coil 324.

[0071] In one embodiment, according to the specific heat capacity formula described above, the temperature rise of the electromagnetic coil 324 is proportional to the power consumed by the electromagnetic coil 324. Therefore, the adjustable voltage drive circuit 510 can also stop outputting the first drive voltage to the electromagnetic coil 324 when the continuous output duration of the first drive voltage exceeds a duration threshold (e.g., 30s).

[0072] In this way, the adjustable voltage drive circuit 510 can control the duration of the first drive voltage output to the electromagnetic coil 324, thereby more accurately de-icing the contacts and preventing the electromagnetic coil 324 from overheating for too long and consuming too much electrical energy. At the same time, it can also reduce the wear and tear on the electromagnetic coil 324, minimizing its impact on its lifespan.

[0073] In the above embodiments, the above-mentioned duration threshold is only an example provided by the embodiments of this application. In specific implementation, the above-mentioned duration threshold can be calibrated according to the material, length, diameter of electromagnetic coil 324 and the current ambient temperature, etc. The embodiments of this application do not impose specific limitations on this.

[0074] In one implementation, it is still as follows Figure 5 As shown, a temperature sensor 410 is provided on the circuit board 400. This temperature sensor 410 can be provided on the circuit board 400 near the contact pin 329 of the electromagnetic switch 320 to detect the temperature of the contact pin 329 of the electromagnetic switch 320.

[0075] In the above embodiment, the temperature of the contact pin 329 of the electromagnetic switch 320 is detected more accurately by a temperature sensor 410 located near the contact pin 329 on the circuit board 400, which allows for more precise control of the temperature of the electromagnetic coil 324 when it heats up. This not only better avoids excessive heat generation by the electromagnetic coil 324, thus reducing energy waste, but also minimizes the wear and tear on the electromagnetic coil 324 and its lifespan.

[0076] In one embodiment, the temperature of the contact pin 329 of the electromagnetic switch 320 can also be the ambient temperature, which is detected by a corresponding temperature sensor. Therefore, since a temperature sensor is provided in the environment where the electromagnetic switch 320 is located to detect the ambient temperature, there is no need to add an additional temperature sensor, thus reducing costs.

[0077] Figure 6 Another schematic diagram of the power supply device provided in the embodiments of this application. For example... Figure 6 As shown in the illustration, this application also provides a power supply device 300. The power supply device 300 includes an input port 310, a power conversion circuit 120, an electromagnetic switch 320, an output port 330, a second control circuit 340, and an adjustable voltage drive circuit 510. The output port 330 is used to connect to electrical equipment. One contact pin 329 of the electromagnetic switch 320 is connected to the output terminal of the power conversion circuit 120, and the other contact pin 329 of the electromagnetic switch 320 is connected to the output port 330. The input terminal of the power conversion circuit 120 is connected to a storage battery or the power grid through the input port 310. The adjustable voltage drive circuit 510 is connected to the electromagnetic coil 324 of the electromagnetic switch 320. When the temperature of the contact pin 329 of the electromagnetic switch 320 is less than a first temperature threshold, the adjustable voltage drive circuit 510 outputs a first drive voltage to the electromagnetic coil 324. The first drive voltage is greater than the rated voltage of the electromagnetic switch 320 and less than the upper limit operating voltage of the electromagnetic switch.

[0078] In the above manner, when the temperature of the contact pin 329 of the electromagnetic switch 320 in the power supply equipment 300 is less than the first temperature threshold, the adjustable voltage drive circuit 510 can actively control the drive voltage of the electromagnetic coil 324 of the electromagnetic switch 320 to be greater than the rated voltage of the electromagnetic switch 320, so that the electromagnetic coil 324 can heat up faster, thereby quickly increasing the internal temperature of the electromagnetic switch 320, so that the ice layer on the moving contact 327 and the stationary contact 328 can melt in time, ensuring that the electromagnetic switch 320 can operate normally, so that the power supply equipment 300 can normally convert the power energy input from the energy storage battery or the grid to supply power to the electrical equipment connected to the output port 330.

[0079] When the input port 310 is connected to the power grid, the power conversion circuit 120 includes, but is not limited to, an AC-DC conversion circuit, a DC-DC conversion circuit, and an inverter circuit. When the input port 310 is connected to an energy storage battery, the power conversion circuit 120 includes, but is not limited to, a DC-DC conversion circuit, a voltage regulator circuit, and a power distribution circuit.

[0080] In one embodiment, when the power conversion circuit 120 is in operation, if the current at the contact pin 329 of the electromagnetic switch 320 is greater than the current threshold, the adjustable voltage drive circuit 510 stops outputting the first drive voltage to the electromagnetic coil 324 and outputs the rated voltage of the electromagnetic switch 320 to the electromagnetic coil 324.

[0081] In the above embodiment, the current at contact pin 329 being greater than the current threshold indicates that the electromagnetic switch 320 is in operation. At this time, if the adjustable voltage drive circuit 510 continues to output the first drive voltage, the electromagnetic coil 324 will consume too much electrical energy and will also cause some wear and tear on the electromagnetic coil 324, affecting its service life.

[0082] In this embodiment, when the current at the contact pin is greater than the current threshold, the adjustable voltage drive circuit 510 actively stops outputting the first drive voltage to the electromagnetic coil 324 and outputs the rated voltage to the electromagnetic coil 324. Based on this, the loss of the electromagnetic coil 324 can be reduced while avoiding excessive heating of the electromagnetic coil 324, thereby reducing the impact on the service life of the electromagnetic coil 324.

[0083] In one embodiment, when the duration of the first driving voltage exceeds a duration threshold, the adjustable voltage driving circuit 510 stops outputting the first driving voltage to the electromagnetic coil 324.

[0084] As can be seen from the specific heat capacity formula above, the temperature rise of the electromagnetic coil 324 when it heats up is directly proportional to the power loss of the electromagnetic coil 324. In this way, the adjustable voltage drive circuit 510 can precisely control the heat generation of the electromagnetic coil 324 by actively controlling the duration of the first drive voltage output to the electromagnetic coil 324. This prevents excessive heat generation from affecting the service life of the electromagnetic coil 324 during the de-icing process of the contacts of the electromagnetic switch 320.

[0085] In one embodiment, when the electromagnetic switch 320 is not in operation, the adjustable voltage drive circuit 510 further stops outputting the first drive voltage to the electromagnetic coil 324 when the temperature of the contact pin 329 of the electromagnetic switch 320 rises to a second temperature threshold. The second temperature threshold is greater than the first temperature threshold and is greater than 10°C.

[0086] In the above implementation, when the electromagnetic switch 320 is not in operation, the temperature of the contact pin 329 of the electromagnetic switch 320 rising to the second temperature threshold indicates that the ice layer on the contact has melted and there is no risk of the contact freezing at the current temperature. At this time, the adjustable voltage drive circuit stops outputting the first drive voltage to the electromagnetic coil, which can reduce the power consumption of the electromagnetic coil and also reduce the heat loss of the electromagnetic coil 324, thereby improving the service life of the electromagnetic switch 320.

[0087] In one embodiment, the power supply device 300 further includes a temperature sensor 410 disposed on a circuit board 400. The temperature sensor 410 is disposed on the circuit board near the contact pin 329 of the electromagnetic switch 320 to detect the temperature of the contact pin 329 of the electromagnetic switch 320. The adjustable voltage drive circuit 510 is capable of outputting a first drive voltage to the electromagnetic coil 324 when the temperature detected by the temperature sensor 410 is lower than a first temperature threshold, and stopping the output of the first drive voltage to the electromagnetic coil 324 when the temperature detected by the temperature sensor 410 rises to a second temperature threshold.

[0088] Based on this, the adjustable voltage drive circuit 510 can more accurately control the output duration of the first drive voltage according to the temperature of the contact pin, thereby reducing the loss to the electromagnetic coil while de-icing the contacts, thus reducing the impact on the service life of the electromagnetic coil.

[0089] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply device, characterized by comprising: The power supply equipment includes a power conversion circuit, an adjustable voltage drive circuit, and an electromagnetic switch. The electromagnetic switch is connected to the input or output terminal of the power conversion circuit. The adjustable voltage drive circuit is connected to the electromagnetic coil of the electromagnetic switch. The adjustable voltage drive circuit is used for: When the temperature of the contact pins of the electromagnetic switch is less than a first temperature threshold, a first driving voltage is output to the electromagnetic coil, and the first driving voltage is greater than the rated voltage of the electromagnetic switch.

2. The power supply device according to claim 1, wherein When the power conversion circuit is not in operation, the adjustable voltage drive circuit is also used for: When the temperature of the contact pin of the electromagnetic switch rises to the second temperature threshold, the output of the first driving voltage to the electromagnetic coil is stopped. Wherein, the second temperature threshold is greater than the first temperature threshold and the second temperature threshold is greater than 10°C.

3. The power supply device according to claim 1 or 2, characterized by, The first driving voltage is less than the upper limit operating voltage of the electromagnetic switch.

4. The power supply device according to claim 2 or 3, characterized by, When the power conversion circuit is in operation, the adjustable voltage drive circuit is further used for: When the current at the contact pin is greater than the current threshold, the first driving voltage is stopped from being output to the electromagnetic coil and the rated voltage is output to the electromagnetic coil.

5. The power supply device according to claim 1, wherein The adjustable voltage drive circuit is also used for: When the duration of continuous output of the first driving voltage exceeds a duration threshold, the output of the first driving voltage to the electromagnetic coil is stopped.

6. The power supply device according to any one of claims 1 to 5, wherein The first temperature threshold is greater than -5℃ and less than or equal to 0℃.

7. The powered device of any one of claims 1 to 6, wherein, The power supply device further includes a temperature sensor connected to the adjustable voltage drive circuit, the temperature sensor being used to detect the temperature of the contact pins of the electromagnetic switch.

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