Inductive load power supply circuit and power supply equipment

Abstract

The utility model is suitable for the technical field of power supply equipment, and provides an inductive load power supply circuit and power supply equipment, and the inductive load power supply circuit comprises a follow current switch module, a demagnetizing load module, a follow current module and a demagnetizing module. The first end of the follow current switch module is electrically connected with the first end of the demagnetizing load module, the first end of the power module and the first end of the inductive load, the first end of the follow current module is electrically connected with the second end of the follow current switch module, and the first end of the demagnetizing module is electrically connected with the second end of the demagnetizing load module. The second end of the follow current module is electrically connected with the second end of the demagnetization module, the second end of the power supply module and the second end of the inductive load. According to the inductive load power supply circuit provided by the embodiment of the invention, the inductive load can be demagnetized through the internal resistance of the inductive load and the target demagnetizing resistor in the turn-off process of the inductive load, so that the turn-off time of the inductive load is shortened, and the working efficiency of power supply equipment is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of power supply equipment, and in particular, relates to an inductive load power supply circuit and a power supply equipment. Background Art

[0002] An inductive load refers to a load with inductive properties, that is, a load that can convert electrical energy into energy in the form of a magnetic field. When current flows through an inductive load, a magnetic field is generated, which generates magnetic force to the outside and stores magnetic field energy in the form of a magnetic field. During the shutdown process of the inductive load, it is necessary to release the magnetic field energy so that the electromagnetic force generated by the inductive load disappears in order to shut down the inductive load. At present, the method of controlling the shutdown of inductive loads (such as relays and electromagnetic gates) is to demagnetize the inductive load through its own internal resistance. However, since the internal resistance of the inductive load is small, the demagnetization process lasts for a long time, resulting in a large shutdown delay of the inductive load. Utility Model Content

[0003] The embodiments of the present application provide an inductive load power supply circuit and a power supply device, which can solve the existing problem of long shutdown delay of the inductive load caused by demagnetization of the inductive load itself through its own internal resistance.

[0004] In a first aspect, an embodiment of the present application provides an inductive load power supply circuit, including a freewheeling switch module, a demagnetization load module, a freewheeling module, and a demagnetization module;

[0005] The first end of the freewheeling switch module is electrically connected to the first end of the demagnetization load module, the first end of the power module and the first end of the inductive load respectively, the first end of the freewheeling module is electrically connected to the second end of the freewheeling switch module, the first end of the demagnetization module is electrically connected to the second end of the demagnetization load module, and the second end of the freewheeling module is electrically connected to the second end of the demagnetization module, the second end of the power module and the second end of the inductive load respectively;

[0006] When the inductive load is turned off, the freewheeling switch module is disconnected, and the demagnetization load module is used to determine a target demagnetization resistance according to a first control signal, so that the target demagnetization resistance, the inductive load and the demagnetization module form a demagnetization loop.

[0007] In a possible implementation of the first aspect, the demagnetization load module includes multiple demagnetization resistors and multiple switch units, all of the demagnetization load modules are connected in series between the first end of the demagnetization module and the first end of the inductive load, the switch units correspond to the demagnetization resistors one by one, and each of the switch units is connected in parallel with the corresponding demagnetization resistor.

[0008] In a possible implementation of the first aspect, the switching unit includes a first switching tube, a gate of the first switching tube is used to receive the first control signal, a source of the first switching tube is electrically connected to a first end of the demagnetization resistor, and a drain of the first switching tube is electrically connected to a second end of the demagnetization resistor.

[0009] In a possible implementation of the first aspect, the freewheeling switch module includes a second switch tube, a gate of the second switch tube is used to receive a second control signal, a source of the second switch tube is electrically connected to the first end of the demagnetization load module, the first end of the power supply module and the first end of the inductive load, respectively, and a drain of the second switch tube is electrically connected to the first end of the freewheeling module.

[0010] In a possible implementation of the first aspect, the freewheeling module includes a first diode, an anode of the first diode is electrically connected to the second end of the power module, the second end of the demagnetization module and the second end of the inductive load, respectively, and a cathode of the first diode is electrically connected to the second end of the freewheeling switch module.

[0011] In a possible implementation of the first aspect, the demagnetization module includes a second diode, an anode of the second diode is electrically connected to the second end of the freewheeling module, the second end of the power module and the second end of the inductive load, respectively, and a cathode of the second diode is electrically connected to the second end of the demagnetization load module.

[0012] In a possible implementation of the first aspect, the inductive load power supply circuit also includes a detection module and a control module, the first end of the detection module is electrically connected to the second end of the freewheeling module, the second end of the detection module is electrically connected to the second end of the demagnetization module, the output end of the detection module is electrically connected to the control module, and the control module is electrically connected to the control end of the freewheeling switch module and the control end of the demagnetization load module, respectively.

[0013] In a possible implementation of the first aspect, the inductive load power supply circuit also includes a first switch module, a first end of the first switch module is used to be electrically connected to the first end of the power supply module, and a second end of the first switch module is respectively electrically connected to the first end of the freewheeling switch module, the first end of the demagnetization load module and the first end of the inductive load.

[0014] In a possible implementation of the first aspect, the inductive load power supply circuit also includes a second switch module, a first end of the second switch module is used to be electrically connected to the second end of the power module, and a second end of the second switch module is electrically connected to the second end of the freewheeling module.

[0015] In a second aspect, an embodiment of the present application provides a power supply device, comprising the inductive load power supply circuit described in any one of the first aspects.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] The inductive load power supply circuit provided in the embodiment of the present application includes a freewheeling switch module, a demagnetization load module, a freewheeling module and a demagnetization module. When the power module does not supply power to the inductive load, the inductive load is turned off and the freewheeling switch module is disconnected, that is, the first end of the freewheeling module and the first end of the inductive load are disconnected, thereby disconnecting the demagnetization circuit formed by the freewheeling module and the inductive load. At the same time, the demagnetization load module is used to determine the target demagnetization resistance according to the first control signal, so that the target demagnetization resistance, the inductive load and the demagnetization module form a demagnetization circuit, and the inductive load is discharged through the demagnetization circuit. Since the target demagnetization resistance has a certain resistance value, the inductive load power supply circuit provided in the embodiment of the present application can avoid the problem of large shutdown delay caused by the inductive load being demagnetized only by its own internal resistance during the shutdown process. It can be seen from this that the inductive load power supply circuit provided in the embodiment of the present application, during the inductive load shutdown process, by disconnecting the demagnetization circuit formed by the freewheeling module and the inductive load, the inductive load is discharged through the demagnetization circuit formed by the target demagnetization resistor, the inductive load and the demagnetization module, so that the inductive load is demagnetized through the inductive load's own internal resistance and the target demagnetization resistor, shortening the shutdown time of the inductive load and improving the working efficiency of the power supply equipment. At the same time, the inductive load power supply circuit provided in the embodiment of the present application can also be discharged and demagnetized with demagnetization resistors of different resistance values. The larger the resistance value of the demagnetization resistor, the shorter the shutdown time of the inductive load, and the smaller the resistance value of the demagnetization resistor, the longer the shutdown time of the inductive load, thereby realizing the control of the shutdown time of the inductive load. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a principle block diagram of an inductive load power supply circuit provided in an embodiment of the present application;

[0020] Figure 2 It is a circuit connection diagram of an inductive load power supply circuit provided in one embodiment of the present application;

[0021] Figure 3 is a principle block diagram of an inductive load power supply circuit provided in another embodiment of the present application;

[0022] Figure 4 is a circuit connection diagram of an inductive load power supply circuit provided in another embodiment of the present application;

[0023] Figure 5 is a principle block diagram of an inductive load power supply circuit provided in another embodiment of the present application;

[0024] Figure 6 is a circuit connection diagram of an inductive load power supply circuit provided in another embodiment of the present application;

[0025] Figure 7 It is a circuit connection diagram of an inductive load power supply circuit provided in another embodiment of the present application.

[0026] In the figure: 10, inductive load power supply circuit; 101, freewheeling switch module; 102, demagnetization load module; 103, freewheeling module; 104, demagnetization module; 105, detection module; 106, control module; 107, first switch module; 108, second switch module; 20, power supply module; 30, inductive load. DETAILED DESCRIPTION

[0027] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0028] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0029] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0030] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0032] Specifically, in the existing inductive load power supply circuit, the method of controlling the inductive load (such as relay, electromagnetic brake) to turn off is to demagnetize the inductive load itself through its internal resistance. However, since the internal resistance of the inductive load is small, the demagnetization process lasts for a long time, resulting in a large delay in turning off the inductive load.

[0033] Based on the above problems, the inductive load power supply circuit provided in the embodiment of the present application includes a freewheeling switch module, a demagnetization load module, a freewheeling module and a demagnetization module. When the power module does not supply power to the inductive load, the inductive load is turned off and the freewheeling switch module is disconnected, that is, the first end of the freewheeling module and the first end of the inductive load are disconnected, thereby disconnecting the demagnetization circuit formed by the freewheeling module and the inductive load. At the same time, the demagnetization load module is used to determine the target demagnetization resistance according to the first control signal, so that the target demagnetization resistance, the inductive load and the demagnetization module form a demagnetization circuit, and the inductive load is discharged through the demagnetization circuit. Since the target demagnetization resistance has a certain resistance value, the inductive load power supply circuit provided in the embodiment of the present application can avoid the problem of large shutdown delay caused by the inductive load being demagnetized only by its own internal resistance during the shutdown process. It can be seen from this that the inductive load power supply circuit provided in the embodiment of the present application, during the inductive load shutdown process, by disconnecting the demagnetization circuit formed by the freewheeling module and the inductive load, the inductive load is discharged through the demagnetization circuit formed by the target demagnetization resistor, the inductive load and the demagnetization module, so that the inductive load is demagnetized through the inductive load's own internal resistance and the target demagnetization resistor, shortening the shutdown time of the inductive load and improving the working efficiency of the power supply equipment. At the same time, the inductive load power supply circuit provided in the embodiment of the present application can also be discharged and demagnetized with demagnetization resistors of different resistance values. The larger the resistance value of the demagnetization resistor, the shorter the shutdown time of the inductive load, and the smaller the resistance value of the demagnetization resistor, the longer the shutdown time of the inductive load, thereby realizing the control of the shutdown time of the inductive load.

[0034] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0035] Figure 1 FIG. 1 shows a principle block diagram of an inductive load power supply circuit 10 provided in an embodiment of the present application. Figure 1 As shown, the inductive load power supply circuit 10 includes a freewheeling switch module 101, a demagnetization load module 102, a freewheeling module 103 and a demagnetization module 104. The first end of the freewheeling switch module 101 is electrically connected to the first end of the demagnetization load module 102, the first end of the power module 20 and the first end of the inductive load 30, respectively, the first end of the freewheeling module 103 is electrically connected to the second end of the freewheeling switch module 101, the first end of the demagnetization module 104 is electrically connected to the second end of the demagnetization load module 102, and the second end of the freewheeling module 103 is electrically connected to the second end of the demagnetization module 104, the second end of the power module 20 and the second end of the inductive load 30, respectively.

[0036] Specifically, when the power module 20 does not supply power to the inductive load 30, the inductive load 30 is turned off, and the freewheeling switch module 101 is disconnected, that is, the first end of the freewheeling module 103 and the first end of the inductive load 30 are disconnected, thereby disconnecting the demagnetization circuit formed by the freewheeling module 103 and the inductive load 30. At the same time, the demagnetization load module 102 is used to determine the target demagnetization resistance according to the first control signal, so that the target demagnetization resistance, the inductive load 30 and the demagnetization module 104 form a demagnetization circuit, and the inductive load 30 is discharged through the demagnetization circuit. Since the target demagnetization resistance has a certain resistance value, the inductive load power supply circuit 10 provided in the embodiment of the present application can avoid the problem of large shutdown delay caused by the inductive load 30 being demagnetized only by its own internal resistance during the shutdown process. It can be seen that the inductive load power supply circuit 10 provided in the embodiment of the present application, during the shutdown process of the inductive load 30, by disconnecting the demagnetization circuit formed by the freewheeling module 103 and the inductive load 30, the inductive load 30 is discharged through the demagnetization circuit formed by the target demagnetization resistor, the inductive load 30 and the demagnetization module 104, so that the inductive load 30 is demagnetized through the internal resistance of the inductive load 30 itself and the target demagnetization resistor, shortening the shutdown time of the inductive load 30 and improving the working efficiency of the power supply equipment. At the same time, the inductive load power supply circuit 10 provided in the embodiment of the present application can also be discharged and demagnetized with demagnetization resistors of different resistance values. The larger the resistance value of the demagnetization resistor, the shorter the shutdown time of the inductive load 30, and the smaller the resistance value of the demagnetization resistor, the longer the shutdown time of the inductive load 30, thereby realizing the control of the shutdown time of the inductive load 30.

[0037] It should be noted that when the power module 20 supplies power to the inductive load 30, the inductive load 30 is used to store energy, and the freewheeling switch module 101 is in a conducting state, so that the first end of the freewheeling module 103 is connected to the first end of the inductive load 30. That is, when the inductive load 30 works normally, it is necessary to maintain the current in the inductive load 30, and the freewheeling module 103 is used to provide a low-impedance channel for the inductive load 30 to ensure the normal operation of the inductive load power supply circuit 10.

[0038] It should be noted that the control mode of the freewheeling switch module 101 can be manually controlled or controlled by a controller. When the power module 20 supplies power to the inductive load 30, the freewheeling switch module 101 is controlled to be turned on, and when the inductive load 30 is turned off, the freewheeling switch module 101 is controlled to be turned off. The first control signal received by the demagnetization load module 102 can be an operation control signal of the demagnetization load module 102 by the user. For example, the demagnetization load module 102 may be equipped with multiple gear switches (first gear, second gear, etc.), and the user can manually select the gear, or can adjust the gear according to the shutdown speed or shutdown time requirements of the inductive load 30 to select the corresponding gear (i.e. determine the target demagnetization resistance) to achieve the shutdown of the inductive load 30. The control signal can also be sent by the controller, and the user can set the gear in advance. When the inductive load 30 is turned off, the controller sends a control signal to the demagnetization load module 102, and the demagnetization load module 102 determines the target demagnetization resistance according to the control signal to achieve the shutdown of the inductive load 30.

[0039] It should be noted that one or more switching devices, rectifier devices and filters can be integrated inside the power module 20. The switching device is used to control the on and off of the current and adjust the output voltage and current. The rectifier device is used to ensure the stability of the current output by the power module 20. The filter is used to purify the power module 20 and ensure the stability of the voltage and current output by the power module 20.

[0040] In one embodiment of the present application, the demagnetization load module 102 includes multiple demagnetization resistors and multiple switch units. All the demagnetization load modules 102 are connected in series between the first end of the demagnetization module 104 and the first end of the inductive load 30. The switch units correspond to the demagnetization resistors one by one, and each switch unit is connected in parallel with the corresponding demagnetization resistor.

[0041] Specifically, the demagnetization resistor is used to provide a demagnetization circuit for the inductive load 30 , and the switch unit is used to determine the target demagnetization resistor according to the control signal. Figure 2The figure shows that the demagnetization load module 102 includes three demagnetization resistors and three switch units. The three switch units are, from top to bottom, a first switch unit 1021, a second switch unit 1022, and a third switch unit 1023. The three demagnetization resistors are, from top to bottom, a first demagnetization resistor R1-1, a second demagnetization resistor R1-2, and a third demagnetization resistor R1-3. Among them, the connection relationship is as follows: the first end of the first switch unit 1021 is electrically connected to the first end of the first demagnetization resistor R1-1 and the first end of the inductive load 30, respectively; the second end of the first switch unit 1021 is electrically connected to the second end of the first demagnetization resistor R1-1, the first end of the second switch unit 1022 and the first end of the second demagnetization resistor R1-2, respectively; the first end of the third switch unit 1023 is electrically connected to the first end of the third demagnetization resistor R1-3, the second end of the second switch unit 1022 and the second end of the second demagnetization resistor R1-2, respectively; the second end of the third switch unit 1023 is electrically connected to the second end of the third demagnetization resistor R1-3 and the first end of the demagnetization module 104, respectively.

[0042] When the first switch unit 1021 is in the on state, the first demagnetization resistor R1-1 is short-circuited, the second demagnetization resistor R1-2 and the third demagnetization resistor R1-3 are used as target demagnetization resistors, and form a demagnetization circuit with the inductive load 30 and the demagnetization module 104, and the inductive load 30 is discharged through the demagnetization circuit, that is, the inductive load 30 is discharged through its own internal resistance, the second demagnetization resistor R1-2 and the third demagnetization resistor R1-3. When the first switch unit 1021 and the second switch unit 1022 are both in the on state, the first demagnetization resistor R1-1 and the second demagnetization resistor R1-2 are short-circuited, and the third demagnetization resistor R1-3 is used as the target demagnetization resistor, and form a demagnetization circuit with the inductive load 30 and the demagnetization module 104, and the inductive load 30 is discharged through the demagnetization circuit, that is, the inductive load 30 is discharged through its own internal resistance and the third demagnetization resistor R1-3. In addition, there are other situations: the first switch unit 1021, the second switch unit 1022 and the third switch unit 1023 are all in the on state; the first switch unit 1021, the second switch unit 1022 and the third switch unit 1023 are all in the off state; the first switch unit 1021 and the third switch unit 1023 are all in the on state; the second switch unit 1022 and the third switch unit 1023 are all in the on state; the second switch unit 1022 is in the on state; and the third switch unit 1023 is in the on state. It can be seen that when the demagnetization load module 102 includes three demagnetization resistors and three switch units, there are 2 switch units. 3 The target demagnetization resistance corresponds to a maximum of 2 3 Kind of resistance value.

[0043] For example, the resistance value of each demagnetization resistor may be the same or different. When the resistance value of each demagnetization resistor is different, the target demagnetization resistor corresponds to at most 2 3 For example, if the resistance of the first demagnetization resistor R1-1 is 900Ω, the resistance of the second demagnetization resistor R1-2 is 300Ω, and the resistance of the third demagnetization resistor R1-3 is 100Ω. When the three switch units are in the off state, the resistance of the target demagnetization resistor is 1300Ω (900Ω + 300Ω + 100Ω); when the three switch units are in the on state, the resistance of the target demagnetization resistor is 0Ω; when the first switch unit 1021 is in the on state, the resistance of the target demagnetization resistor is 400Ω (300Ω + 100Ω); when the second switch unit 1022 is in the on state, the resistance of the target demagnetization resistor is 1000Ω (900Ω + 100Ω); when the third switch unit 10 23 is in the on state, the resistance of the target demagnetization resistor is 1200Ω (900Ω + 300Ω); when the first switch unit 1021 and the second switch unit 1022 are both in the on state, the resistance of the target demagnetization resistor is 100Ω; when the first switch unit 1021 and the third switch unit 1023 are both in the on state, the resistance of the target demagnetization resistor is 300Ω; when the second switch unit 1022 and the third switch unit 1023 are both in the on state, the resistance of the target demagnetization resistor is 900Ω. According to the actual test situation, it can be obtained that the above 8 situations are realized, and the turn-off time of the inductive load 30 is between 182ms and 556ms. The user can control the conduction and disconnection of the switch unit according to actual needs, that is, the demagnetization load module 102 added in this application can adjust the turn-off time of the inductive load 30 to meet the turn-off time requirement of the inductive load 30.

[0044] Exemplarily, the switch units (the first switch unit 1021, the second switch unit 1022 and the third switch unit 1023) can adopt different types of semiconductor power switching devices such as IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), GTO (Gate Turn-Off Thyristor), etc.

[0045] In one embodiment of the present application, Figure 2As shown, the switch unit includes a first switch tube Q1, a gate of the first switch tube Q1 is used to receive a first control signal, a source of the first switch tube Q1 is electrically connected to a first end of a demagnetizing resistor, and a drain of the first switch tube Q1 is electrically connected to a second end of the demagnetizing resistor.

[0046] Specifically, the first switch tube Q1 is used to be turned on or off according to the first control signal, so as to control the connection between the demagnetization resistor, the demagnetization module 104 and the inductive load 30. When the first switch tube Q1 is in the on state, the demagnetization resistor connected in parallel with it is short-circuited, and the demagnetization resistor is not used as the target demagnetization resistor, and does not form a demagnetization loop with the demagnetization module 104 and the inductive load 30. When the first switch tube Q1 is in the off state, the demagnetization resistor connected in parallel with it will not be short-circuited, and the demagnetization resistor is used as the target demagnetization resistor, and forms a demagnetization loop with the demagnetization module 104 and the inductive load 30.

[0047] It should be noted that the first control signal may be an operation control signal of the switch unit by the user, or may be sent by the controller, which will not be described in detail here.

[0048] Exemplarily, the first switch tube Q1 may be an IGBT tube.

[0049] In one embodiment of the present application, Figure 2 As shown, the freewheeling switch module 101 includes a second switch tube Q2, the gate of the second switch tube Q2 is used to receive a second control signal, the source of the second switch tube Q2 is electrically connected to the first end of the demagnetization load module 102, the first end of the power module 20 and the first end of the inductive load 30, respectively, and the drain of the second switch tube Q2 is electrically connected to the first end of the freewheeling module 103.

[0050] Specifically, the second switch tube Q2 is used to be turned on or off according to the second control signal, so as to control the connection between the freewheeling module 103 and the inductive load 30. When the second switch tube Q2 is in the on state, the freewheeling module 103 and the inductive load 30 are connected, and the inductive load 30 can achieve freewheeling through the freewheeling module 103 to ensure normal operation. At the same time, if there is no special requirement for the turn-off time of the inductive load 30, the inductive load 30 can also be demagnetized by the freewheeling module 103 and slowly turned off. When the second switch tube Q2 is in the off state, the freewheeling module 103 and the inductive load 30 are disconnected, and the inductive load 30 cannot be slowly turned off by the freewheeling module 103.

[0051] It should be noted that the second control signal may be an operation control signal of the switch unit by the user, or may be sent by the controller, and its principle is basically the same as that of the first control signal, which will not be described in detail here.

[0052] Exemplarily, the second switch tube Q2 may be an IGBT tube.

[0053] In one embodiment of the present application, Figure 2 As shown, the freewheeling module 103 includes a first diode D1, an anode of the first diode D1 is electrically connected to the second end of the power module 20, the second end of the demagnetization module 104 and the second end of the inductive load 30, respectively, and a cathode of the first diode D1 is electrically connected to the second end of the freewheeling switch module 101.

[0054] Specifically, the first diode D1 is used for unidirectional conduction and freewheeling, and ensures that the inductive load power supply circuit 10 works normally when the power module 20 supplies power to the inductive load 30 .

[0055] In one embodiment of the present application, Figure 2 As shown, the demagnetization module 104 includes a second diode D2, the anode of the second diode D2 is electrically connected to the second end of the freewheeling module 103, the second end of the power module 20 and the second end of the inductive load 30, respectively, and the cathode of the second diode D2 is electrically connected to the second end of the demagnetization load module 102.

[0056] Specifically, the second diode D2 is used for unidirectional conduction and is also used to ensure that when the inductive load 30 is working normally, the demagnetization load module 102 is in a cut-off state and does not consume power. At the same time, the second diode D2 is also used to ensure that the freewheeling channel of the inductive load 30 is not interrupted during the shutdown process.

[0057] In one embodiment of the present application, Figure 3 As shown, the inductive load power supply circuit 10 also includes a detection module 105 and a control module 106. The first end of the detection module 105 is electrically connected to the second end of the freewheeling module 103, the second end of the detection module 105 is electrically connected to the second end of the demagnetization module 104, the output end of the detection module 105 is electrically connected to the control module 106, and the control module 106 is electrically connected to the control end of the freewheeling switch module 101 and the control end of the demagnetization load module 102, respectively.

[0058] Specifically, the detection module 105 is used to detect the current in the inductive load 30 and determine whether the inductive load 30 can generate force to the outside. When the inductive load 30 works normally, the current in the inductive load 30 can generate force to the outside. Therefore, the detection module 105 is set to detect the current in the inductive load 30 and transmit the detection result to the control module 106. The control module 106 is used to determine the conduction state of the switch unit and the conduction state of the freewheeling switch module 101 according to the detection result.

[0059] It should be noted that if Figure 4As shown, the detection module 105 includes a detection chip U1, the model of which can be CC6921SO-30A, and uses Hall current detection. The control module 106 includes a controller U2, which is used to output a first control signal and a second control signal according to a detection signal and a reference signal.

[0060] In one embodiment of the present application, Figure 5 As shown, the inductive load power supply circuit 10 further includes a first switch module 107 and a second switch module 108, wherein the first end of the first switch module 107 is used to be electrically connected to the first end of the power module 20, and the second end of the first switch module 107 is respectively electrically connected to the first end of the freewheeling switch module 101, the first end of the demagnetization load module 102, and the first end of the inductive load 30. The first end of the second switch module 108 is used to be electrically connected to the second end of the power module 20, and the second end of the second switch module 108 is respectively electrically connected to the second end of the freewheeling module 103.

[0061] Specifically, the first switch module 107 and the second switch module 108 are used to control the power module 20 to supply power to the inductive load 30. When the first switch module 107 and the second switch module 108 are both in the on state, the first end of the power module 20 is electrically connected to the first end of the inductive load 30, and the power module 20 can supply power to the inductive load 30. When the first switch module 107 and the second switch module 108 are in the off state, the first end of the power module 20 is disconnected from the first end of the inductive load 30, and the power module 20 cannot supply power to the inductive load 30. At the same time, the second switch module 108 is also used to protect the power module 20. During the process of shutting down the inductive load 30, a voltage pulse or reverse current may be generated, which may cause damage to the power module 20. By controlling the second switch module, the circuit can be cut off when necessary to prevent the voltage pulse or reverse current from being transmitted to the power module 20, thereby effectively protecting the power module 20 from potential damage.

[0062] It should be noted that the second switch module 108 may be omitted according to actual conditions, that is, the second switch module 108 may not be provided, and only the first switch module 107 may be used.

[0063] In one embodiment of the present application, Figure 6As shown, the first switch module 107 includes a third switch tube Q3, a first capacitor C1 and a first varistor RV1, the gate of the third switch tube Q3 is used to receive a third control signal, the drain of the third switch tube Q3 is electrically connected to the first end of the first varistor RV1, the first end of the first capacitor C1 and the first end of the power module 20, and the source of the third switch tube Q3 is electrically connected to the second end of the first varistor RV1, the second end of the first capacitor C1 and the first end of the freewheeling switch module 101. The second switch module 108 includes a fourth switch tube Q4, a second capacitor C2 and a second varistor RV2, the gate of the fourth switch tube Q4 is used to receive a fourth control signal, the source of the fourth switch tube Q4 is electrically connected to the first end of the second varistor RV2, the first end of the second capacitor C2 and the second end of the power module 20, and the drain of the fourth switch tube Q4 is electrically connected to the second end of the second resistor R2, the second end of the second capacitor C2 and the second end of the freewheeling module 103.

[0064] Specifically, the third switch tube Q3 and the fourth switch tube Q4 are used to turn on and off according to the third control signal, so as to control the power module 20 to supply power to the inductive load 30. The first capacitor C1 and the first varistor RV1 are used for voltage clamping, and the second capacitor C2 and the second varistor RV2 are used for voltage clamping to protect the device from being damaged. In the extreme case where both the freewheeling switch module 101 and the demagnetization load module 102 are disconnected, the inductive load 30 will induce a very high voltage, which may cause damage to the devices on the line. The first varistor RV1 and the second varistor RV2 can be used to clamp the voltage and protect the device.

[0065] It should be noted that the third control signal and the fourth control signal may be operation control signals of the switch unit by the user, or may be sent by the controller, which will not be described in detail herein.

[0066] Exemplarily, the third switch tube Q3 and the fourth switch tube Q4 can both be IGBT tubes.

[0067] In one embodiment of the present application, Figure 7 As shown, the inductive load power supply circuit 10 also includes a second resistor R2, a third resistor R3, a fourth resistor R4, a third varistor RV3, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6. The second resistor R2, the third resistor R3 and the fourth resistor R4 are connected in series between the first end and the second end of the power module 20 to eliminate the residual voltage of the power supply. The third varistor RV3 is used for protection, and the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 form a rectification circuit for rectification.

[0068] The present application also discloses a power supply device, including the above-mentioned inductive load power supply circuit. During the shutdown process of the inductive load, the demagnetization circuit formed by the freewheeling module and the inductive load can be disconnected, so that the inductive load is discharged through the demagnetization circuit formed by the target demagnetization resistor, the inductive load and the demagnetization module, so that the inductive load is demagnetized through the inductive load's own internal resistance and the target demagnetization resistor, thereby shortening the shutdown time of the inductive load and improving the working efficiency of the power supply device.

[0069] Since the processing and functions implemented by the power supply device in this embodiment basically correspond to the embodiments, principles and examples of the aforementioned inductive load power supply circuit, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0070] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An inductive load power supply circuit, characterized in that: It includes a freewheeling switch module, a demagnetization load module, a freewheeling module and a demagnetization module; The first end of the freewheeling switch module is electrically connected to the first end of the demagnetization load module, the first end of the power module and the first end of the inductive load respectively, the first end of the freewheeling module is electrically connected to the second end of the freewheeling switch module, the first end of the demagnetization module is electrically connected to the second end of the demagnetization load module, and the second end of the freewheeling module is electrically connected to the second end of the demagnetization module, the second end of the power module and the second end of the inductive load respectively; When the inductive load is turned off, the freewheeling switch module is disconnected, and the demagnetization load module is used to determine a target demagnetization resistance according to a first control signal, so that the target demagnetization resistance, the inductive load and the demagnetization module form a demagnetization loop.

2. The inductive load power supply circuit according to claim 1, characterized in that: The demagnetization load module includes multiple demagnetization resistors and multiple switch units. All the demagnetization load modules are connected in series between the first end of the demagnetization module and the first end of the inductive load. The switch units correspond to the demagnetization resistors one by one, and each switch unit is connected in parallel with the corresponding demagnetization resistor.

3. The inductive load power supply circuit according to claim 2, characterized in that: The switch unit includes a first switch tube, a gate of the first switch tube is used to receive the first control signal, a source of the first switch tube is electrically connected to a first end of the demagnetization resistor, and a drain of the first switch tube is electrically connected to a second end of the demagnetization resistor.

4. The inductive load power supply circuit according to claim 1, characterized in that: The freewheeling switch module includes a second switch tube, a gate of the second switch tube is used to receive a second control signal, a source of the second switch tube is electrically connected to the first end of the demagnetization load module, the first end of the power module and the first end of the inductive load respectively, and a drain of the second switch tube is electrically connected to the first end of the freewheeling module.

5. The inductive load power supply circuit according to claim 1, characterized in that: The freewheeling module includes a first diode, an anode of the first diode is electrically connected to the second end of the power module, the second end of the demagnetization module and the second end of the inductive load respectively, and a cathode of the first diode is electrically connected to the second end of the freewheeling switch module.

6. The inductive load power supply circuit according to claim 1, characterized in that: The demagnetization module includes a second diode, an anode of the second diode is electrically connected to the second end of the freewheeling module, the second end of the power module and the second end of the inductive load respectively, and a cathode of the second diode is electrically connected to the second end of the demagnetization load module.

7. The inductive load power supply circuit according to any one of claims 1 to 6, characterized in that: The inductive load power supply circuit also includes a detection module and a control module, the first end of the detection module is electrically connected to the second end of the freewheeling module, the second end of the detection module is electrically connected to the second end of the demagnetization module, the output end of the detection module is electrically connected to the control module, and the control module is electrically connected to the control end of the freewheeling switch module and the control end of the demagnetization load module, respectively.

8. The inductive load power supply circuit according to any one of claims 1 to 6, characterized in that: The inductive load power supply circuit also includes a first switch module, a first end of the first switch module is used to be electrically connected to the first end of the power module, and a second end of the first switch module is respectively electrically connected to the first end of the freewheeling switch module, the first end of the demagnetization load module and the first end of the inductive load.

9. The inductive load power supply circuit according to any one of claims 1 to 6, characterized in that: The inductive load power supply circuit further includes a second switch module, a first end of the second switch module is used to be electrically connected to a second end of the power module, and a second end of the second switch module is electrically connected to a second end of the freewheeling module.

10. A power supply device, characterized in that: The inductive load power supply circuit comprises the inductive load power supply circuit as described in any one of claims 1 to 9.

Images