Power supply control system and refrigerating system

Abstract

The invention discloses a power supply control system and a refrigeration system.The power supply control system comprises a main switch, a processor and a first voltage conversion module, and the processor controls the enabling end of the first voltage conversion module to be in an invalid state when a load of the first voltage conversion module is abnormal; and then the main switch is controlled to be switched off, and the first voltage conversion module performs voltage conversion on the direct current when the enabling end of the first voltage conversion module is in an effective state so as to supply power to the load. It can be seen that the processor controls the enabling end of the first voltage conversion module to be in the effective state when the load normally operates, normal power supply of the load is guaranteed, the enabling end of the first voltage conversion module is firstly controlled to be in the invalid state and then the main switch is controlled to be switched off when the load is abnormal, and on-load switching off of the main switch is avoided; therefore, the safety and the stability of the power supply control system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply control system and a refrigeration system. Background Art

[0002] The power supply control system usually includes PLC (Programmable Logic Controller), main switch and frequency converter. The main switch is connected to the motor through the frequency converter, and the PLC controls the frequency converter. When the motor is running, an emergency stop may occur suddenly. If the load is disconnected by directly disconnecting the main switch, the motor has not completely stopped due to inertia, and the main switch is cut off with load, which affects the safety of the main switch. For example, when the main switch is a contactor, the electric energy in the circuit will be released in the form of an arc, causing the contactor's contacts to produce arcing. For a long time, it will cause the contactor to stick, reducing the safety and stability of the power supply control system. Summary of the invention

[0003] The object of the present invention is to provide a power supply control system and a refrigeration system, which can first control the enable end of the first voltage conversion module to be in an invalid state and then control the main switch to be disconnected when an abnormal load occurs, thereby avoiding the main switch being cut off under load when the load is operating abnormally, affecting the safety of the main switch, and thereby improving the safety and stability of the power supply control system.

[0004] In order to solve the above technical problems, the present invention provides a power supply control system, comprising:

[0005] A main switch, the main switch is arranged between the direct current and the input end of the first voltage conversion module;

[0006] a processor, the processor being connected to the control end of the main switch and the enable end of the first voltage conversion module respectively, and being used for controlling the enable end of the first voltage conversion module to be in an invalid state when an abnormality occurs to the load of the first voltage conversion module, and controlling the main switch to be disconnected after controlling the enable end to be in an invalid state;

[0007] The first voltage conversion module has an output end connected to the load and is used to perform voltage conversion on the direct current when the enable end is in a valid state to supply power to the load.

[0008] Optionally, also include:

[0009] A pre-charging switch, wherein a first end of the pre-charging switch is respectively connected to the positive electrode of the direct current and the first end of the main switch, and a control end is connected to the processor;

[0010] A pre-charging resistor, wherein a first end of the pre-charging resistor is connected to a second end of the pre-charging switch, and a second end of the pre-charging resistor is respectively connected to a second end of the main switch and a first end of a voltage stabilizing capacitor;

[0011] The voltage stabilizing capacitor, the second end of the voltage stabilizing capacitor is connected to the negative electrode of the direct current;

[0012] The processor is also used to control the pre-charge switch to close before controlling the first voltage conversion module to work, so as to pre-charge the voltage-stabilizing capacitor, and control the main switch to close and the pre-charge switch to open after the pre-charging of the voltage-stabilizing capacitor is completed.

[0013] Optionally, the processor is further used to control the enable end of the first voltage conversion module to be in an invalid state when the pre-charging switch is closed, and to control the enable end of the first voltage conversion module to be in a valid state after the pre-charging of the voltage stabilizing capacitor is completed.

[0014] Optionally, the main switch is a main contactor, a first end of a first contact of the main contactor is connected to a positive electrode of direct current, a second end is connected to a positive electrode of an input end of a first voltage conversion module, a first end of a second contact is respectively connected to a first end of the first contact and the positive electrode of direct current, a second end is connected to a first end of the pre-charging switch, and a coil of the main contactor is connected to the processor;

[0015] The switching states of the first contact and the second contact are opposite.

[0016] Optionally, also include:

[0017] A second voltage conversion module, wherein the input end of the second voltage conversion module is connected to the direct current, and the output end is connected to the processor, and is used to perform voltage conversion on the direct current to power the processor.

[0018] Optionally, also include:

[0019] A filter module, wherein a first end of the filter module is connected to the output end of the first voltage conversion module, and a second end of the filter module is connected to the load.

[0020] Optionally, also include:

[0021] an enable switch, wherein a first end of the enable switch is connected to a first end of an enable end of the first voltage conversion module, and a second end of the enable switch is connected to a positive power supply port of the processor;

[0022] The second end of the enable terminal of the first voltage conversion module is connected to the negative power supply port of the processor;

[0023] The processor is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module so as to control the enable end of the first voltage conversion module to be in an invalid state, and control the main switch to be disconnected after controlling the enable end to be in an invalid state.

[0024] Optionally, also include:

[0025] an enabling switch, wherein a first end of the enabling switch is connected to a first end of the enabling end of the first voltage conversion module, and a second end of the enabling switch is connected to a second end of the enabling end of the first voltage conversion module;

[0026] The processor is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module so as to control the enable end of the first voltage conversion module to be in an invalid state, and control the main switch to be disconnected after controlling the enable end to be in an invalid state.

[0027] Optionally, the main switch is a main contactor, a first end of a contact of the main contactor is connected to direct current, a second end is connected to an input end of a first voltage conversion module, and a coil of the main contactor is connected to the processor;

[0028] The power supply control system further includes:

[0029] A capacitor is connected in parallel with the coil.

[0030] In order to solve the above technical problem, the present invention further provides a refrigeration system, comprising a motor and a power supply control system as described above, wherein the power supply control system is connected to the motor.

[0031] The present application provides a power supply control system and a refrigeration system, the power supply control system includes a main switch, a processor and a first voltage conversion module, wherein the processor controls the enable end of the first voltage conversion module to be in an invalid state when an abnormality occurs in the load of the first voltage conversion module, and controls the main switch to be disconnected after controlling the enable end to be in an invalid state, and the first voltage conversion module performs voltage conversion on direct current when the enable end of the first voltage conversion module is in an effective state to supply power to the load. It can be seen that the processor of the present application controls the enable end of the first voltage conversion module to be in an effective state when the load is operating normally, ensuring that the first voltage conversion module performs voltage conversion on direct current and supplies power to the load, and when an abnormality occurs in the load, first controls the enable end of the first voltage conversion module to be in an invalid state and then controls the main switch to be disconnected, avoiding the main switch being cut off with load when the load is operating abnormally, affecting the safety of the main switch, and thus improving the safety and stability of the power supply control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the structure of a power supply control system provided by the present invention;

[0034] Figure 2 A schematic diagram of the structure of a specific power supply control system provided by the present invention;

[0035] Figure 3 A schematic diagram of the structure of another specific power supply control system provided by the present invention;

[0036] Figure 4 A schematic structural diagram of another specific power supply control system provided by the present invention. DETAILED DESCRIPTION

[0037] The core of the present invention is to provide a power supply control system and a refrigeration system, which can first control the enable end of the first voltage conversion module to be in an invalid state and then control the main switch to disconnect when an abnormal load occurs, thereby avoiding the main switch being cut off under load when the load is operating abnormally, affecting the safety of the main switch, and thus improving the safety and stability of the power supply control system.

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The power supply control system usually includes PLC, main switch and frequency converter. The main switch is connected to the motor through the frequency converter, and the PLC controls the frequency converter to work. When the motor is running, an emergency stop may occur suddenly. If the load is disconnected by directly disconnecting the main switch, the motor has not completely stopped due to inertia, and the main switch is cut off with load, which affects the safety of the main switch. For example, when the main switch is a contactor, the electric energy in the circuit will be released in the form of an arc, causing the contactor's contacts to produce arcing. For a long time, it will cause the contactor to stick, reducing the safety and stability of the power supply control system.

[0040] In order to solve the above technical problems, the present invention provides a power supply control system.

[0041] Specifically, see Figure 1 As shown, Figure 1 A schematic diagram of the structure of a power supply control system provided by the present invention, Figure 1 In the example, the main switch 1 is set between the positive pole of the direct current and the positive pole of the input end of the first voltage conversion module 3. The power supply control system includes:

[0042] A main switch 1, which is arranged to connect the DC power to the input end of the first voltage conversion module 3;

[0043] Processor 2, processor 2 is connected to the control end of main switch 1 and the enable end of first voltage conversion module 3 respectively, and is used to control the enable end of first voltage conversion module 3 to be in an invalid state when the load of first voltage conversion module 3 is abnormal, and control main switch 1 to be disconnected after controlling the enable end to be in an invalid state;

[0044] The first voltage conversion module 3 has an output end connected to a load and is used to perform voltage conversion on direct current when the enabling end is in a valid state to supply power to the load.

[0045] The power supply control system includes a main switch 1, a processor 2 and a first voltage conversion module 3, wherein the processor 2 and the first voltage conversion module 3 communicate through a communication protocol, and the processor sends corresponding instructions to the first voltage conversion module to control the operation of the first voltage conversion module 3, thereby driving the operation of the load. It should be noted that the load here can be but not limited to a motor, the first voltage conversion module 3 can be but not limited to a frequency converter, and the frequency converter can be specifically DC / DC or DC / AC. When the frequency converter is DC / DC, the load is a DC load, and the processor can be but not limited to a PLC. The communication protocol can be a CAN (Controller Area Network) bus protocol or a 485 communication protocol. The CAN bus protocol supports a large number of nodes and can provide low latency and high reliability; the 485 communication protocol can adopt the RS-485 communication protocol. RS-485 transmits data in a balanced transmission and differential reception manner, and has the ability to suppress common mode interference.

[0046] Specifically, during normal operation, the processor 2 controls the main switch 1 to be turned on, and the direct current is used to supply power to the first voltage conversion module 3 and the load through the main switch 1. At the same time, the processor 2 controls the enable port of the first voltage conversion module 3 to be in a valid state, so that the first voltage conversion module 3 can step up / down and invert the direct current, and convert it into the voltage actually required by the load to maintain the normal operation of the load; if the load of the first voltage conversion module 3 is abnormal due to electromagnetic interference or other reasons, the abnormality of the load is not limited to excessive voltage, too low voltage, and excessive current. At this time, the power supply control system needs to be disconnected. In order to avoid the main switch 1 disconnecting the rear-end load with load, which affects the safety of the main switch 1, in this embodiment, the processor 2 controls the enable port of the first voltage conversion module 3 to be in an invalid state when the load of the first voltage conversion module 3 is abnormal, and the connection between the main switch 1 and the load is disconnected. At this time, disconnecting the main switch 1 can avoid arcs caused by load disconnection, protect the safety of the main switch 1, and thus improve the safety and stability of the power supply control system.

[0047] It can be seen that in this embodiment, the processor 2 controls the enable end of the first voltage conversion module 3 to be in a valid state when the load is operating normally, thereby ensuring that the first voltage conversion module 3 performs voltage conversion on the DC power and supplies power to the load. When an abnormality occurs in the load, the enable end of the first voltage conversion module 3 is first controlled to be in an invalid state and then the main switch 1 is controlled to be disconnected, thereby avoiding the main switch 1 being cut off under load when the load is operating abnormally, affecting the safety of the main switch 1, and thereby improving the safety and stability of the power supply control system.

[0048] Based on the above embodiments:

[0049] As an optional embodiment, it also includes:

[0050] A pre-charging switch, wherein a first end of the pre-charging switch is respectively connected to the positive electrode of the direct current and the first end of the main switch 1, and a control end is connected to the processor 2;

[0051] A pre-charging resistor, wherein the first end of the pre-charging resistor is connected to the second end of the pre-charging switch, and the second end of the pre-charging resistor is respectively connected to the second end of the main switch 1 and the first end of the voltage stabilizing capacitor;

[0052] A voltage stabilizing capacitor, wherein a second end of the voltage stabilizing capacitor is connected to a negative electrode of the direct current;

[0053] The processor 2 is also used to control the pre-charging switch to close before controlling the first voltage conversion module 3 to work, so as to pre-charge the voltage stabilizing capacitor, and control the main switch 1 to close and control the pre-charging switch to open after the voltage stabilizing capacitor is pre-charged.

[0054] In this embodiment, in order to avoid the voltage instability of the first voltage conversion module 3 due to the change of load size / voltage fluctuation of direct current, and to improve the voltage stability and reliability of the power supply control system, a voltage stabilizing capacitor is set between the first voltage conversion module 3 and the main switch 1 in this embodiment. Before controlling the first voltage conversion module 3 to work, the processor 2 first controls the pre-charging switch to close to pre-charge the voltage stabilizing capacitor. After the pre-charging is completed, that is, the difference between the voltage of the voltage stabilizing capacitor and the voltage of the direct current is less than the preset voltage difference, the processor 2 controls the main switch 1 to close and controls the pre-charging switch to open. In the process of the main switch 1 closing to supply power to the load, the voltage stabilizing capacitor balances the voltage fluctuation in the power supply control system by absorbing excess charge or releasing stored charge, thereby maintaining the voltage stability in the power supply control system. In addition, in order to limit the current when pre-charging the voltage stabilizing capacitor and avoid excessive instantaneous current shock at the moment when the pre-charging switch is closed, thereby protecting the equipment in the power supply control system, this embodiment also sets a pre-charging resistor in the branch where the pre-charging switch is located. The pre-charging resistor limits the flow rate of the current, so that the voltage stabilizing capacitor is charged slowly, thereby avoiding a sudden increase in current, causing overload and damage to the power supply control system.

[0055] It can be seen that the processor 2 controls the pre-charging switch to close before the first voltage conversion module 3 works, so as to pre-charge the voltage-stabilizing capacitor, so as to balance the voltage fluctuation in the power supply control system when the main switch 1 is closed to power the load, thereby maintaining the voltage stability in the power supply control system, and using the pre-charging resistor to limit the current when pre-charging the voltage-stabilizing capacitor, thereby further improving the stability of the power supply system.

[0056] As an optional embodiment, the processor 2 is also used to control the enable end of the first voltage conversion module 3 to be in an invalid state when the pre-charging switch is closed, and to control the enable end of the first voltage conversion module 3 to be in a valid state after the pre-charging of the voltage stabilizing capacitor is completed.

[0057] In the present embodiment, if the load of the first voltage conversion module 3 operates abnormally when the pre-charging switch is closed to pre-charge the voltage-stabilizing capacitor, the current passing through the pre-charging resistor will increase instantaneously at this time, and the pre-charging resistor will be burned out if the time is too long. In order to protect the pre-charging resistor, the present embodiment controls the enable end of the first voltage conversion module 3 to be in an invalid state when the pre-charging switch is closed, disconnects the load, and the first voltage conversion module 3 has no output, thereby avoiding abnormal operation of the load and excessive current in the pre-charging resistor. After the pre-charging of the voltage-stabilizing capacitor is completed, the enable end of the first voltage conversion module 3 is controlled to be in a valid state, and it is determined that the first voltage conversion module 3 can output voltage to the load to maintain normal operation of the load.

[0058] It can be seen that this embodiment uses the processor 2 to control the enable end of the first voltage conversion module 3 to be in an invalid state when the pre-charging switch is closed, and controls the enable end of the first voltage conversion module 3 to be in a valid state after the pre-charging of the voltage-stabilizing capacitor is completed, thereby avoiding the situation where the current of the pre-charging resistor increases instantaneously when the load of the first voltage conversion module 3 operates abnormally, thereby causing the pre-charging resistor to burn out, thereby improving the reliability of the power supply control system.

[0059] As an optional embodiment, the main switch 1 is a main contactor, the first end of the first contact of the main contactor is connected to the positive electrode of the direct current, the second end is connected to the positive electrode of the input end of the first voltage conversion module 3, the first end of the second contact is respectively connected to the first end of the first contact and the positive electrode of the direct current, the second end is connected to the first end of the pre-charging switch, and the coil of the main contactor is connected to the processor 2;

[0060] The switching states of the first contact and the second contact are opposite.

[0061] Specifically, if the main switch 1 is the main contactor, since the switching states of the first contact and the second contact of the main contactor are opposite, when the first contact of the main contactor is in a closed state, the second contact is in an open state. Even if the pre-charging switch is suddenly closed, the second contact of the branch where the pre-charging switch is located is in an open state, and the branch where the pre-charging switch is located is also in an open state, thereby realizing the interlocking of the main switch 1 and the pre-charging switch, and improving the safety and reliability of the power supply system.

[0062] If the main switch 1 is the main contactor and the pre-charging switch is the pre-charging contactor, the second contact of the main switch 1 is set on the branch where the coil of the pre-charging contactor is located. Since the switching states of the first contact and the second contact of the main contactor are opposite, when the main contactor is closed, the first contact of the main contactor is in a closed state and the second contact is in an open state. Even if the coil of the pre-charging contactor is suddenly energized, the pre-charging contactor will not be closed, thereby improving the safety and reliability of the power supply control system.

[0063] It can be seen that in this embodiment, by setting the second contact of the main switch 1 in the branch where the pre-charging switch is located, and the switching states of the first contact and the second contact are opposite, the branch where the pre-charging switch is located is avoided from being turned on when the main switch 1 is closed, and the interlocking of the main switch 1 and the pre-charging switch is realized, thereby improving the safety and reliability of the power supply system.

[0064] As an optional embodiment, it also includes:

[0065] The second voltage conversion module has an input end connected to direct current, and an output end connected to the processor 2, and is used for performing voltage conversion on the direct current to supply power to the processor 2.

[0066] In this embodiment, in order to reduce resource waste and realize reasonable allocation of resources, the second voltage conversion module is used to convert the voltage of the direct current to power the processor 2, thereby improving the utilization rate of resources.

[0067] It can be seen that in this embodiment, the second voltage conversion module is used to perform voltage conversion on the DC power for powering the load to power the processor 2, and no additional DC power needs to be added, thereby improving resource utilization.

[0068] As an optional embodiment, it also includes:

[0069] A filter module, wherein a first end of the filter module is connected to the output end of the first voltage conversion module 3 , and a second end of the filter module is connected to the load.

[0070] Specifically, in order to make the voltage input to the load smoother and reduce pulsation, thereby providing a more stable input voltage, the present embodiment provides a filtering module for filtering out clutter, thereby making the voltage input to the load smoother.

[0071] It can be seen that the filtering module can effectively filter out the noise and interference components in the output voltage output by the first voltage conversion module 3, smooth the direct current, remove high-frequency noise, make the voltage input to the load more stable, and thus improve the quality of the voltage input to the load.

[0072] As an optional embodiment, it also includes:

[0073] An enabling switch, wherein a first end of the enabling switch is connected to a first end of an enabling end of the first voltage conversion module 3, and a second end of the enabling switch is connected to a positive power supply port of the processor 2;

[0074] The second end of the enable terminal of the first voltage conversion module 3 is connected to the negative power supply port of the processor 2;

[0075] The processor 2 is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module 3 to control the enable end of the first voltage conversion module 3 to be in an invalid state, and control the main switch 1 to be disconnected after the enable end is controlled to be in an invalid state.

[0076] In this embodiment, the enable end includes two ports, namely, a first end and a second end. When the first end and the second end receive a power signal, the enable end is in a valid state. When the first end and the second end do not receive a power signal, the enable end is in an invalid state. In practical applications, the first end may specifically be a DI port, and the second end may be a GND. In order to control the enable end of the first voltage conversion module 3, in this embodiment, an enable switch is set between the first end of the enable end of the first voltage conversion module 3 and the positive power supply port of the processor 2, and the enable end of the first voltage conversion module 3 is controlled to be in an invalid / valid state by controlling the opening / closing of the enable switch, wherein the enable switch may be an intermediate relay or a virtual switch inside the processor 2, or may be an additionally set relay.

[0077] For details, see Figure 2 As shown, Figure 2 The schematic diagram of the structure of a specific power supply control system provided by the present invention, wherein the first end of the enable end of the first voltage conversion module 3 is the upper port of the enable end of the first voltage conversion module 3, when the processor controls the enable switch to be closed, the upper port of the enable end of the first voltage conversion module 3 is connected to the positive power supply port of the processor 2, and the enable end of the first voltage conversion module 3 is in a valid state; when the processor controls the enable switch to be disconnected, the upper port of the enable end of the first voltage conversion module 3 is disconnected from the positive power supply port of the processor 2, and the enable end of the first voltage conversion module 3 is in an invalid state. Please refer to Figure 3 As shown, Figure 3 A structural schematic diagram of another specific power supply control system provided by the present invention, wherein the first end of the enable end of the first voltage conversion module 3 is the lower port of the enable end of the first voltage conversion module 3, when the processor controls the enable switch to be closed, the lower port of the enable end of the first voltage conversion module 3 is connected to the negative power supply port of the processor 2, and the enable end of the first voltage conversion module 3 is in a valid state; when the processor controls the enable switch to be disconnected, the lower port of the enable end of the first voltage conversion module 3 is disconnected from the negative power supply port of the processor 2, and the enable end of the first voltage conversion module 3 is in an invalid state.

[0078] It can be seen that in this embodiment, the enable switch is set between the first end and the second end of the enable end of the first voltage conversion module 3, controls the opening / closing of the enable switch, and then controls whether the enable end receives power, thereby making the enable end of the first voltage conversion module 3 in an invalid / valid state.

[0079] As an optional embodiment, it also includes:

[0080] An enabling switch, wherein a first end of the enabling switch is connected to a first end of the enabling end of the first voltage conversion module 3, and a second end of the enabling switch is connected to a second end of the enabling end of the first voltage conversion module 3;

[0081] The processor 2 is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module 3 to control the enable end of the first voltage conversion module 3 to be in an invalid state, and control the main switch 1 to be disconnected after the enable end is controlled to be in an invalid state.

[0082] In this embodiment, in order to control the enable end of the first voltage conversion module 3, the enable switch is set between the first end and the second end of the enable end of the first voltage conversion module 3, and the enable end of the first voltage conversion module 3 is controlled to be in an invalid / valid state by controlling the opening / closing of the enable switch, wherein the enable switch can be an intermediate relay and a virtual switch inside the processor 2, or it can be an additionally set relay.

[0083] For details, see Figure 4 As shown, Figure 4 A schematic diagram of the structure of another specific power supply control system provided by the present invention, wherein the first end of the enable end of the first voltage conversion module 3 is connected to the upper port of the enable end of the first voltage conversion module 3, and the second end of the enable end of the first voltage conversion module 3 is connected to the lower port of the enable end of the first voltage conversion module 3. When the processor controls the enable switch to be closed, the upper port of the enable end of the first voltage conversion module 3 is connected to the lower port, and the enable end of the first voltage conversion module 3 is in a valid state; when the processor controls the enable switch to be disconnected, the upper port of the enable end of the first voltage conversion module 3 is disconnected from the lower port, and the enable end of the first voltage conversion module 3 is in an invalid state. In practical applications, the first end can be specifically a DI port, and the second end can be GND, that is, whether the enable end of the first voltage conversion module 3 is in an invalid state is determined by whether the DI port receives a low level.

[0084] It can be seen that in this embodiment, the enable switch is set between the first end and the second end of the enable end of the first voltage conversion module 3, and the enable end of the first voltage conversion module 3 is in an invalid / valid state by controlling the opening / closing of the enable switch, thereby realizing the control of the enable end of the first voltage conversion module 3.

[0085] As an optional embodiment, the main switch 1 is a main contactor, a first end of a contact of the main contactor is connected to direct current, a second end is connected to an input end of the first voltage conversion module 3, and a coil of the main contactor is connected to the processor 2;

[0086] The power supply control system also includes:

[0087] A capacitor connected in parallel with the coil.

[0088] Specifically, if the main switch 1 is the main contactor, considering that the load operates abnormally due to the power failure of the power supply port of the processor 2 and the processor 2 cannot control the main switch 1 to be cut off after the load stops, the present application connects a capacitor in parallel with the coil of the main contactor, so that the main contactor can continue to be in a closed state for a period of time, such as 2s, when the power supply port of the processor 2 loses power, so that the main contactor can be cut off after the load stops, further improving the safety and stability of the power supply control system.

[0089] It can be seen that, in this embodiment, by connecting a capacitor in parallel to the coil of the main contactor, the main contactor can continue to be in a closed state for a period of time when the power supply port of the processor 2 loses power, so that the main contactor can be cut off after the load is disconnected, thereby further improving the safety and stability of the power supply control system.

[0090] The present invention also provides a refrigeration system, including a motor and the power supply control system as described above.

[0091] It should be noted that the introduction of a refrigeration system provided by the present invention can refer to the embodiment of the power supply control system, and the present invention will not be repeated here. The power supply control system and the motor work together to ensure the normal operation and high efficiency of the refrigeration system.

[0092] It can be seen that the refrigeration system provided in this embodiment uses the processor 2 to control the enable end of the first voltage conversion module 3 to be in a valid state when the load is operating normally, thereby ensuring that the first voltage conversion module 3 converts the voltage of the DC power and supplies power to the load. When the load is abnormal, the enable end of the first voltage conversion module 3 is first controlled to be in an invalid state and then the main switch 1 is controlled to be disconnected, thereby avoiding the main switch 1 being cut off under load when the load is operating abnormally, affecting the safety of the main switch 1, and thereby improving the safety and stability of the power supply control system.

[0093] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0094] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0095] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply control system, characterized in that: include: A main switch, the main switch is arranged between the direct current and the input end of the first voltage conversion module; a processor, the processor being connected to the control end of the main switch and the enable end of the first voltage conversion module respectively, and being used for controlling the enable end of the first voltage conversion module to be in an invalid state when an abnormality occurs to the load of the first voltage conversion module, and controlling the main switch to be disconnected after controlling the enable end to be in an invalid state; The first voltage conversion module has an output end connected to the load and is used to perform voltage conversion on the direct current when the enable end is in a valid state to supply power to the load.

2. The power supply control system according to claim 1, characterized in that: Also includes: A pre-charging switch, wherein a first end of the pre-charging switch is respectively connected to the positive electrode of the direct current and the first end of the main switch, and a control end is connected to the processor; A pre-charging resistor, wherein a first end of the pre-charging resistor is connected to a second end of the pre-charging switch, and a second end of the pre-charging resistor is respectively connected to a second end of the main switch and a first end of a voltage stabilizing capacitor; The voltage stabilizing capacitor, the second end of the voltage stabilizing capacitor is connected to the negative electrode of the direct current; The processor is also used to control the pre-charge switch to close before controlling the first voltage conversion module to work, so as to pre-charge the voltage-stabilizing capacitor, and control the main switch to close and the pre-charge switch to open after the pre-charging of the voltage-stabilizing capacitor is completed.

3. The power supply control system according to claim 2, characterized in that: The processor is further configured to control the enable end of the first voltage conversion module to be in an invalid state when the pre-charging switch is closed, and to control the enable end of the first voltage conversion module to be in a valid state after the pre-charging of the voltage stabilizing capacitor is completed.

4. The power supply control system according to claim 2, characterized in that: The main switch is a main contactor, a first end of a first contact of the main contactor is connected to a positive electrode of direct current, a second end is connected to a positive electrode of an input end of a first voltage conversion module, a first end of a second contact is respectively connected to a first end of the first contact and the positive electrode of direct current, a second end is connected to a first end of the pre-charging switch, and a coil of the main contactor is connected to the processor; The switching states of the first contact and the second contact are opposite.

5. The power supply control system according to claim 1, characterized in that: Also includes: A second voltage conversion module, wherein the input end of the second voltage conversion module is connected to the direct current, and the output end is connected to the processor, and is used to perform voltage conversion on the direct current to power the processor.

6. The power supply control system according to claim 1, characterized in that: Also includes: A filter module, wherein a first end of the filter module is connected to the output end of the first voltage conversion module, and a second end of the filter module is connected to the load.

7. The power supply control system according to claim 1, characterized in that: Also includes: an enable switch, wherein a first end of the enable switch is connected to a first end of an enable end of the first voltage conversion module, and a second end of the enable switch is connected to a positive power supply port of the processor; The second end of the enable terminal of the first voltage conversion module is connected to the negative power supply port of the processor; The processor is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module so as to control the enable end of the first voltage conversion module to be in an invalid state, and control the main switch to be disconnected after controlling the enable end to be in an invalid state.

8. The power supply control system according to claim 1, characterized in that: Also includes: an enabling switch, wherein a first end of the enabling switch is connected to a first end of the enabling end of the first voltage conversion module, and a second end of the enabling switch is connected to a second end of the enabling end of the first voltage conversion module; The processor is connected to the control end of the enable switch, and is specifically used to control the enable switch to be disconnected when an abnormality occurs in the load of the first voltage conversion module so as to control the enable end of the first voltage conversion module to be in an invalid state, and control the main switch to be disconnected after controlling the enable end to be in an invalid state.

9. The power supply control system according to any one of claims 1 to 8, characterized in that: The main switch is a main contactor, a first end of a contact of the main contactor is connected to direct current, a second end is connected to an input end of a first voltage conversion module, and a coil of the main contactor is connected to the processor; The power supply control system further includes: A capacitor is connected in parallel with the coil.

10. A refrigeration system, comprising a motor and a power supply control system according to any one of claims 1 to 9, wherein the power supply control system is connected to the motor.

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