Demagnetization circuit, motor assembly, and vehicle system

Abstract

The present application discloses a demagnetization circuit, a motor assembly, and a vehicle system. A secondary winding of a transformer is connected to an input end of a rectifier circuit; an output end of the rectifier circuit, an excitation winding, and an excitation switch circuit are connected in series; a demagnetization module is connected between a demagnetization node and the secondary winding of the transformer; the demagnetization node is located between the excitation winding and the excitation switch circuit. The demagnetization node is provided on a circuit between the excitation switch circuit and the excitation winding, and a driving control circuit controls the switching state of the excitation switch circuit, so that the demagnetization module can quickly demagnetize the excitation winding when the excitation switch circuit is turned off; during demagnetization, the demagnetization module clamps the voltage of the excitation winding, accelerating the release of magnetic field energy within the excitation winding, further shortening the demagnetization time, also protecting rectifier devices in the secondary winding and the load, improving the reliability of the circuit.

Description

Demagnetization circuit, motor assembly and vehicle system

[0001] This application is based on Chinese Patent Application No. 202410438950.6 entitled "Demagnetization circuit, motor assembly and vehicle system" filed on April 11, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of automobile technology, in particular to a demagnetization circuit, a motor assembly and a vehicle system. BACKGROUND

[0003] With the continuous development of new energy vehicles, the motor has become an important development direction of the electric drive assembly of new energy vehicles. Among them, the basic requirements of electric vehicles for motor drive systems are high efficiency, large torque-to-mass ratio and wide speed regulation range. Hybrid excitation motor has the characteristics of high efficiency similar to permanent magnet synchronous motor and adjustable air gap flux of electric excitation motor, making it an important choice for vehicle drive motor. The rotor in the hybrid excitation motor includes a permanent magnet rotor and an excitation rotor. At present, in order to make the magnetic field propagate in the excitation rotor meet the relevant path requirements, the rotor winding needs to be demagnetized quickly.

[0004] In the current motor rotor demagnetization circuit, although the transient voltage suppressor (TVS) or voltage stabilizing tube is used to reduce the demagnetization time of the rotor winding, since the lower limit of the clamping voltage of the TVS and the voltage stabilizing tube is lower, there may be a problem of insufficiently fast demagnetization time. TECHNICAL PROBLEM

[0005] In view of the above problems, the present application provides a demagnetization circuit, a motor assembly and a vehicle system, which can solve the problem of insufficiently fast demagnetization time in the current motor demagnetization scheme. TECHNICAL SOLUTION

[0006] In view of the above problems, the present application provides a demagnetization circuit, a motor assembly and a vehicle system, which can solve the problem of insufficiently fast demagnetization time in the current motor demagnetization scheme.

[0007] The first aspect of the embodiments of the present application provides a demagnetization circuit, comprising: a transformer, a rectifier circuit, a demagnetization module, an excitation winding, an excitation switch circuit and a drive control circuit.

[0008] The secondary winding of the transformer is connected with the input end of the rectifier circuit, the output end of the rectifier circuit, the excitation winding and the excitation switch circuit are connected in series, and the excitation switch circuit is controlled by the drive control circuit.

[0009] The demagnetization module is connected between a demagnetization node and a secondary winding of the transformer; wherein the demagnetization node is located on a line between the excitation switch circuit and the excitation winding, and the demagnetization module is configured to demagnetize the excitation winding when the excitation switch circuit is turned off.

[0010] In the technical solution of the embodiments of the present application, the secondary winding of the transformer is connected to an input end of a rectifier circuit, an output end of the rectifier circuit, the excitation winding, and the excitation switch circuit are connected in series, the demagnetization module is connected between a demagnetization node and the secondary winding of the transformer, the demagnetization node is arranged on a line between the excitation switch circuit and the excitation winding, and the switching state of the excitation switch circuit is controlled by the drive control circuit, so that the demagnetization module can quickly demagnetize the excitation winding when the excitation switch circuit is turned off, and the voltage of the excitation winding is clamped by the demagnetization module during the demagnetization process, which accelerates the discharge of the magnetic field energy in the excitation winding, further shortens the demagnetization time, and protects the rectifier devices and the load of the secondary winding, thereby improving the reliability of the circuit.

[0011] In some embodiments, the demagnetization module is connected between a first end and / or a second end of the secondary winding of the transformer and the demagnetization node.

[0012] In the technical solution of the embodiments of the present application, the demagnetization module can be connected between a first end of the secondary winding of the transformer and the demagnetization node, and in the case that the excitation switch circuit is turned off, a current forms a demagnetization current path via the demagnetization module, the first end of the secondary winding, the rectifier circuit, and the excitation winding, so as to demagnetize the excitation winding. The demagnetization module can also be connected between a second end of the secondary winding of the transformer and the demagnetization node, and in the case that the excitation switch circuit is turned off, a current forms another demagnetization current path via the demagnetization module, the second end of the secondary winding, the rectifier circuit, and the excitation winding, so as to demagnetize the excitation winding.

[0013] In some embodiments, the secondary winding of the transformer includes a first secondary winding, and the demagnetization module is connected between a first end and / or a second end of the first secondary winding and the demagnetization node.

[0014] In the technical solution of the embodiments of the present application, the demagnetization module can be connected between a first end of the first secondary winding of the transformer and the demagnetization node, and in the case that the excitation switch circuit is turned off, a current forms a demagnetization current path via the demagnetization module, the first end of the first secondary winding, the rectifier circuit, and the excitation winding, so as to demagnetize the excitation winding. The demagnetization module can also be connected between a second end of the first secondary winding and the demagnetization node, and in the case that the excitation switch circuit is turned off, a current forms another demagnetization current path via the demagnetization module, the second end of the first secondary winding, the rectifier circuit, and the excitation winding, so as to demagnetize the excitation winding.

[0015] In some embodiments, the secondary winding of the transformer further comprises a second secondary winding, the demagnetization module is connected between a first end and / or a second end of the second secondary winding and the demagnetization node, the first secondary winding is in series with the second secondary winding, and a common node of the first secondary winding and the second secondary winding is connected to the field switch circuit.

[0016] In the technical scheme of the embodiments of the present application, the first end of the first secondary winding can serve as a first end of the secondary winding, the first end of the second secondary winding can serve as a second end of the secondary winding, the second end of the first secondary winding and the second end of the second secondary winding are commonly connected and can serve as a third end of the secondary winding, the demagnetization module can be connected between the first end of the second secondary winding of the transformer and the demagnetization node, and in the case where the field switch circuit is disconnected, a current forms a demagnetization current path via the demagnetization module, the first end of the second secondary winding, the rectifier circuit and the field winding, so as to demagnetize the field winding. The demagnetization module can be connected between the second end of the second secondary winding and the demagnetization node, and in the case where the field switch circuit is disconnected, a current forms a demagnetization current path via the demagnetization module, the second end of the second secondary winding, the rectifier circuit and the field winding, so as to demagnetize the field winding.

[0017] In some embodiments, the demagnetization module comprises a first demagnetization element, which is connected between the first end of the secondary winding of the transformer and the demagnetization node.

[0018] In the technical scheme of the embodiments of the present application, the first demagnetization element is connected between the first end of the secondary winding of the transformer and the demagnetization node, and in the case where the field switch circuit is disconnected, a current forms a demagnetization current path via the first demagnetization element, the first end of the secondary winding, the rectifier circuit and the field winding, so as to clamp the voltage across the field winding within a specified voltage range and rapidly demagnetize the field winding, which can significantly improve the demagnetization speed.

[0019] In some embodiments, the demagnetization module further comprises a second demagnetization element, which is connected between the second end of the secondary winding of the transformer and the demagnetization node.

[0020] In the technical scheme of the embodiments of the present application, the second demagnetization element is connected between the second end of the secondary winding of the transformer and the demagnetization node, and in the case where the field switch circuit is disconnected, a current forms a demagnetization current path via the second demagnetization element, the second end of the secondary winding, the rectifier circuit and the field winding, so as to clamp the voltage across the field winding within a specified voltage range and rapidly demagnetize the field winding, which can significantly improve the demagnetization speed.

[0021] In some embodiments, the demagnetization module comprises at least one transient voltage suppression diode.

[0022] In the technical scheme of the embodiment of the application, the demagnetization node is arranged on a line between the excitation switch circuit and the excitation winding, the switch state of the excitation switch circuit is controlled by the drive control circuit, and the transient voltage suppression diode is turned on when the excitation switch circuit is turned off, so that the excitation winding can be voltage clamped during demagnetization, the discharge of the magnetic field energy in the excitation winding is accelerated, the demagnetization time is further shortened, and the rectifier devices and the load of the secondary winding are protected, and the reliability of the circuit is improved.

[0023] In some embodiments, the demagnetization module comprises a unidirectional transient voltage suppression diode and a diode, and the unidirectional transient voltage suppression diode and the diode are connected in series with a common anode or a common cathode.

[0024] In some embodiments, the rectifier circuit is any one of a full-wave rectifier, a full-bridge rectifier, a half-wave rectifier, and a voltage doubler rectifier.

[0025] In some embodiments, the drive control circuit is configured to receive a demagnetization control signal and generate a switch driving signal according to the demagnetization control signal to drive the excitation switch circuit to be turned on or turned off.

[0026] In the technical scheme of the embodiment of the application, the drive control circuit can independently control the switch state of the excitation switch circuit, the drive control circuit generates a corresponding switch driving signal according to a demagnetization control signal to drive the excitation switch circuit to be turned off, the current forms a demagnetization current path via the demagnetization module, the first end or the second end of the secondary winding, the rectifier circuit and the excitation winding when the excitation switch circuit is turned off, the voltage across the excitation winding is clamped within a specified voltage range, the excitation winding is rapidly demagnetized, and the demagnetization speed can be significantly improved.

[0027] In some embodiments, the drive control circuit is connected between the secondary winding and the excitation switch circuit.

[0028] The drive control circuit generates a switch driving signal according to the current on the secondary winding to drive the excitation switch circuit to be turned on or turned off.

[0029] In the technical scheme of the embodiment of the application, the drive control circuit can monitor the current on the secondary winding and generate a switch driving signal according to the current on the secondary winding, the drive control circuit generates a corresponding switch driving signal to drive the excitation switch circuit to be turned off when the current on the secondary winding meets a certain condition, the current forms a demagnetization current path via the demagnetization module, the first end or the second end of the secondary winding, the rectifier circuit and the excitation winding when the excitation switch circuit is turned off, the voltage across the excitation winding is clamped within a specified voltage range, the excitation winding is rapidly demagnetized, and the demagnetization speed can be significantly improved.

[0030] In some embodiments, the drive control circuit comprises: a first voltage dividing resistor, a second voltage dividing resistor, and a first capacitor, a first end of the first voltage dividing resistor is connected to one end of the secondary winding, a second end of the first voltage dividing resistor, a first end of the second voltage dividing resistor, and a first end of the first capacitor are connected to a control end of the excitation switch circuit, and a second end of the second voltage dividing resistor and a second end of the first capacitor are connected to a first end of the excitation switch circuit.

[0031] In the technical solution of the embodiments of the present application, the current on the secondary winding flows through the first voltage dividing resistor, the second voltage dividing resistor, and the first capacitor, the first voltage dividing resistor and the second voltage dividing resistor form a voltage dividing circuit, when the current on the secondary winding meets certain conditions, the voltage signal output by the voltage dividing circuit generates a corresponding switch drive signal via the first capacitor, the corresponding switch drive signal drives the excitation switch circuit to be disconnected, in the case of disconnection of the excitation switch circuit, the current forms a demagnetization current path via the demagnetization module, the first end or the second end of the secondary winding, the rectifier circuit, and the excitation winding, so that the voltage across the excitation winding is clamped within a specified voltage range, and the excitation winding is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0032] In some embodiments, the transformer further comprises an auxiliary secondary winding.

[0033] The drive control circuit comprises: a first diode, a second capacitor, a third voltage dividing resistor, and a fourth voltage dividing resistor, an anode of the first diode is connected to a first end of the auxiliary secondary winding, a cathode of the first diode, a first end of the second capacitor, and a first end of the third voltage dividing resistor are connected, a second end of the third voltage dividing resistor and a first end of the fourth voltage dividing resistor are connected to a control end of the excitation switch circuit, and a second end of the second capacitor, a second end of the fourth voltage dividing resistor, and a second end of the auxiliary secondary winding are connected to a first end of the excitation switch circuit.

[0034] In the technical solution of the embodiments of the present application, the secondary winding comprises a first secondary winding and a second secondary winding, the second secondary winding and the first diode form an induction circuit, the current of the primary winding of the transformer outputs a corresponding induction current via the induction circuit, the induction current generates a corresponding switch drive signal via a voltage dividing circuit composed of the third voltage dividing resistor and the fourth voltage dividing resistor, when the current on the primary winding meets certain conditions, the switch drive signal drives the excitation switch circuit to be disconnected, in the case of disconnection of the excitation switch circuit, the current forms a demagnetization current path via the demagnetization module, the first end or the second end of the first secondary winding, the rectifier circuit, and the excitation winding, so that the voltage across the excitation winding is clamped within a specified voltage range, and the excitation winding is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0035] The second aspect of the embodiment of the present application further provides a motor assembly, which comprises a motor rotor, an electronic stator, and the demagnetization circuit according to any one of the above embodiments.

[0036] The excitation winding is arranged on the motor rotor or the electronic stator.

[0037] The third aspect of the embodiment of the present application further provides a vehicle system, which comprises the demagnetization circuit according to any one of the above embodiments, or comprises the motor assembly according to any one of the above embodiments, and the motor assembly is arranged in a synchronous generator or a synchronous motor.

[0038] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood, and to be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. Advantages

[0039] In the technical solution of the embodiment of the present application, the secondary winding of the transformer in the automobile is connected to the input end of the rectifier circuit, the output end of the rectifier circuit, the excitation winding and the excitation switch circuit are connected in series, the demagnetization module is connected between the demagnetization node and the secondary winding of the transformer, the demagnetization node is arranged on the line between the excitation switch circuit and the excitation winding, the switching state of the excitation switch circuit is controlled by the driving control circuit, so that the demagnetization module can quickly demagnetize the excitation winding when the excitation switch circuit is off, and in the demagnetization process, the voltage of the excitation winding is clamped by the demagnetization module, which accelerates the discharge of the magnetic field energy in the excitation winding, further shortens the demagnetization time, and at the same time protects the rectifier devices and the load of the secondary winding, and improves the reliability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations on the present application. Moreover, in the entire drawings, the same reference numerals are used to designate the same components. In the drawings:

[0041] Fig. 1 is a first structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0042] Fig. 2 is a second structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0043] Fig. 3 is a third structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0044] Fig. 4 is a fourth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0045] Fig. 5 is a fifth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0046] Fig. 6 is a sixth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0047] Fig. 7a is a seventh structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0048] Fig. 7b is a demagnetization current schematic diagram of the demagnetization circuit in Fig. 7a;

[0049] Fig. 7c is an equivalent circuit of the secondary side of the demagnetization circuit in Fig. 7a during demagnetization;

[0050] Fig. 7d is a change schematic diagram of the output voltage of the transformer in Fig. 7a;

[0051] Fig. 8 is an eighth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0052] Fig. 9 is a ninth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0053] Fig. 10 is a tenth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0054] Fig. 11 is an eleventh structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0055] Fig. 12 is a twelfth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application;

[0056] Fig. 13 is a thirteenth structure schematic diagram of the demagnetization circuit provided by the embodiment of the present application. Embodiments of the present application

[0057] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0060] Reference herein to "embodiments" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the present application. The phrase is not necessarily used in the same way at different places in the specification. The skilled person explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A1 and / or B, which can represent the three cases of A1 alone, A1 and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0062] In the description of the embodiments of the present application, the term "multiple frames" refers to two or more (including two).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0064] In the current motor rotor demagnetization circuit, although TVS or voltage stabilizing tube is used to reduce the demagnetization time of the rotor winding, since the lower limit of the clamping voltage of the TVS and the voltage stabilizing tube is selected, there may be a problem that the demagnetization time is not fast enough.

[0065] To solve the above technical problems, the embodiment of the present application provides a demagnetization circuit, as shown in Figure 1, the demagnetization circuit in the embodiment comprises: a transformer 100, a rectifier circuit 200, a demagnetization module 600, an excitation winding 300, an excitation switch circuit 400, a drive control circuit 500, the secondary winding of the transformer 100 is connected with the input end of the rectifier circuit 200, the output end of the rectifier circuit 200, the excitation winding 300 and the excitation switch circuit 400 are connected in series, the excitation switch circuit 400 is controlled by the drive control circuit 500, the demagnetization node B is located on the line between the excitation switch circuit 400 and the excitation winding 300, and the demagnetization module 600 is connected between the demagnetization node B and the secondary winding of the transformer 100, wherein the demagnetization module 600 is used for demagnetizing the excitation winding 300 in the case that the excitation switch circuit 400 is turned off.

[0066] In the embodiment, the secondary winding of the transformer 100 is connected with the input end of the rectifier circuit 200, the output end of the rectifier circuit 200, the excitation winding 300 and the excitation switch circuit 400 are connected in series, and the demagnetization module 600 is connected between the demagnetization node B and the secondary winding of the transformer 100. By setting the demagnetization node B on the line between the excitation switch circuit 400 and the excitation winding 300, the switching state of the excitation switch circuit 400 is controlled by the drive control circuit 500, so that the demagnetization module 600 can quickly demagnetize the excitation winding 300 in the case that the excitation switch circuit 400 is turned off. In the demagnetization process, the voltage of the excitation winding 300 is clamped by the demagnetization module 600, the discharge of the magnetic field energy in the excitation winding 300 is accelerated, the demagnetization time is further shortened, and the rectifier device of the secondary winding and the load 700 are protected at the same time, and the reliability of the circuit is improved.

[0067] In some embodiments, as shown in Figure 1, the demagnetization module 600 is connected between the first end A1 of the secondary winding of the transformer 100 and the demagnetization node B.

[0068] In the embodiment, the demagnetization module 600 can be connected between the first end A1 of the secondary winding of the transformer 100 and the demagnetization node B. In the case that the excitation switch circuit 400 is turned off, the current forms a demagnetization current path through the demagnetization module 600, the first end A1 of the secondary winding, the rectifier circuit 200 and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0069] In some embodiments, as shown in Figure 2, the demagnetization module 600 is connected between the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B.

[0070] In the embodiment, the demagnetization module 600 can be connected between the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B. When the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the demagnetization module 600, the second end A2 of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0071] In some embodiments, referring to FIG. 3, the demagnetization module 600 is connected between the first end A1 and the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B.

[0072] In the embodiment, the demagnetization module 600 can be connected between the first end A1 of the secondary winding of the transformer 100 and the demagnetization node B, and also connected between the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B. When the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the demagnetization module 600, the first end A1 of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so as to demagnetize the excitation winding 300, and the current forms another demagnetization current path via the demagnetization module 600, the second end A2 of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0073] In some embodiments, referring to FIG. 4, the demagnetization module 600 includes a first demagnetization element 610 connected between the first end A1 of the secondary winding of the transformer 100 and the demagnetization node B.

[0074] In the embodiment, the first demagnetization element 610 is connected between the first end A1 of the secondary winding of the transformer 100 and the demagnetization node B. When the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the first demagnetization element 610, the first end A1 of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so as to clamp the voltage across the excitation winding 300 within a specified voltage range, and the excitation winding 300 is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0075] In some embodiments, referring to FIG. 4, the rectifier circuit 200 includes a first rectifier element 211. The rectifier circuit 200, the excitation winding 300, the load 700, and the excitation switch circuit 400 are connected in series. As shown in FIG. 4, the anode of the first rectifier element 211 is connected to the first end A1 of the secondary winding, the cathode of the first rectifier element 211 is connected to the first end of the excitation winding 300, the second end of the excitation winding 300 is connected to the first end of the load 700, the second end of the load 700 is connected to the second end A2 of the secondary winding via the excitation switch circuit 400, and the second end of the load 700 is connected to the input end of the rectifier circuit 200 via the demagnetization module 600.

[0076] In some embodiments, referring to FIG. 4, the excitation switch circuit 400 comprises a driving switch element 410, a first end and a second end of the driving switch element 410 are connected to the secondary winding and the load 700 respectively, a control end of the driving switch element 410 is connected to the driving control circuit 500, and a connection state between the first end and the second end of the driving switch element 410 is controlled by a voltage of the control end of the driving switch element 410, for example, when the voltage of the control end of the driving switch element 410 is high, the first end and the second end of the driving switch element 410 are turned on, and when the voltage of the control end of the driving switch element 410 is low, the first end and the second end of the driving switch element 410 are turned off.

[0077] In some embodiments, referring to FIG. 4, the secondary winding of the transformer 100 comprises a first secondary winding 121, and the demagnetization module 600 is connected between a first end A1 of the first secondary winding 121 and a demagnetization node B.

[0078] In the embodiment, the first end of the first secondary winding 121 can be used as the first end A of the secondary winding, the demagnetization module 600 can be connected between the first end of the first secondary winding 121 of the transformer 100 and the demagnetization node B, and in the case that the excitation switch circuit 400 is disconnected, a current forms a demagnetization current path through the demagnetization module 600, the first end of the first secondary winding 121, the rectifier circuit 200 and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0079] In some embodiments, the rectifier circuit 200 is a half-wave rectifier circuit, and referring to FIG. 4, the rectifier circuit 200 comprises a first rectifier element 211, a first end of the first rectifier element 211 is connected to the first end A1 of the secondary winding, and a second end of the first rectifier element 211 is connected to the excitation winding 300.

[0080] In some embodiments, the rectifier circuit 200 is a voltage-doubler rectifier circuit, and referring to FIG. 5, the rectifier circuit 200 comprises a capacitor 222, a diode 221, a diode 223 and a capacitor 224, a first end of the capacitor 222 is connected to the first end A1 of the secondary winding of the transformer 100, a second end of the capacitor 222, a cathode of the diode 221 and an anode of the diode 223 are connected together, a first end of the capacitor 224 and a cathode of the diode 223 are connected to the excitation winding 300, and a second end of the capacitor 224 and an anode of the diode 221 are connected to a second end A2 of the secondary winding of the transformer 100.

[0081] In some embodiments, the rectifier circuit 200 is a full-bridge rectifier circuit, as shown in FIG. 6, the rectifier circuit 200 includes a first rectifier element 211, a second rectifier element 212, a third rectifier element 213, and a fourth rectifier element 214, the first rectifier element 211, the second rectifier element 212, the third rectifier element 213, and the fourth rectifier element 214 form a full-bridge rectifier. The anode of the first rectifier element 211 and the cathode of the third rectifier element 213 are connected to the first end A1 of the secondary winding, the cathode of the first rectifier element 211 and the cathode of the second rectifier element 212 are connected to the excitation winding 300, the cathode of the fourth rectifier element 214 and the anode of the second rectifier element 212 are connected to the second end A2 of the secondary winding, and the anode of the third rectifier element 213 and the anode of the fourth rectifier element 214 are connected to the excitation switch circuit 400.

[0082] In some embodiments, as shown in FIG. 5, the secondary winding of the transformer 100 includes a first secondary winding 121, and the demagnetization module 600 is connected between the second end of the first secondary winding 121 and the demagnetization node B.

[0083] In this embodiment, the second end of the first secondary winding 121 can serve as the second end A2 of the secondary winding of the transformer 100, and the demagnetization module 600 can be connected between the second end of the first secondary winding 121 and the demagnetization node B. In the case where the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the demagnetization module 600, the second end of the first secondary winding 121, the rectifier circuit 200, and the excitation winding 300, thereby demagnetizing the excitation winding 300.

[0084] In some embodiments, as shown in FIG. 6, the secondary winding of the transformer 100 includes a first secondary winding 121, and the demagnetization module 600 is connected between the first end and the second end of the first secondary winding 121 and the demagnetization node B.

[0085] In this embodiment, the first end of the first secondary winding 121 can serve as the first end A1 of the secondary winding, the second end of the first secondary winding 121 can serve as the second end A2 of the secondary winding of the transformer 100, and the demagnetization module 600 can be connected between the first end and the second end of the first secondary winding 121 and the demagnetization node B. In the case where the excitation switch circuit 400 is disconnected, the current forms a first demagnetization current path via the demagnetization module 600, the first end of the first secondary winding 121, the rectifier circuit 200, and the excitation winding 300, and the current forms a second demagnetization current path via the demagnetization module 600, the second end of the first secondary winding 121, the rectifier circuit 200, and the excitation winding 300, and the two demagnetization current paths together demagnetize the excitation winding 300.

[0086] In some embodiments, referring to FIG. 6, the demagnetization module 600 further comprises a second demagnetization element 620 connected between the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B.

[0087] In the present embodiment, the second demagnetization element 620 is connected between the second end A2 of the secondary winding of the transformer 100 and the demagnetization node B. When the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the second demagnetization element 620, the second end A2 of the secondary winding, the rectifier circuit 200, and the excitation winding 300, clamps the voltage across the excitation winding 300 within a specified voltage range, and rapidly demagnetizes the excitation winding 300, which can significantly improve the demagnetization speed.

[0088] In some embodiments, referring to FIG. 6, the first end of the first secondary winding 121 can serve as the first end A1 of the secondary winding, and the second end of the first secondary winding 121 can serve as the second end A2 of the secondary winding. The first end and the second end of the first secondary winding 121 are connected to the demagnetization node B via the demagnetization elements, respectively. The two ends of the first demagnetization element 610 are connected between the first end A1 of the secondary winding and the demagnetization node B, respectively. The two ends of the second demagnetization element 620 are connected between the second end A2 of the secondary winding and the demagnetization node B, respectively. When the excitation switch circuit 400 is disconnected, the excitation winding 300 is demagnetized through the two demagnetization current paths, which can significantly improve the demagnetization speed.

[0089] In some embodiments, referring to FIG. 7a, the secondary winding of the transformer 100 further comprises a second secondary winding 122, and the first secondary winding 121 and the second secondary winding 122 are connected in series. In this case, the first end of the first secondary winding 121 can serve as the first end A1 of the secondary winding, and the first end of the second secondary winding 122 can serve as the second end A2 of the secondary winding. The common node of the first secondary winding 121 and the second secondary winding 122 is connected to the excitation switch circuit 400.

[0090] As shown in FIG. 7a, the first end of the first secondary winding 121 can serve as the first end A1 of the secondary winding, and the first end of the second secondary winding 122 can serve as the second end A2 of the secondary winding. The demagnetization module 600 is connected between the first end A1 and the second end A2 of the secondary winding and the demagnetization node B. The first secondary winding 121 and the second secondary winding 122 are connected in series, and the common node of the first secondary winding 121 and the second secondary winding 122 is connected to the excitation switch circuit 400.

[0091] In the embodiment, the demagnetization module 600 can be connected between the first end of the second secondary side 122 of the transformer 100 and the demagnetization node B, and simultaneously connected between the first end of the first secondary side of the transformer 100 and the demagnetization node B. In the case that the excitation switch circuit 400 is disconnected, the current forms a demagnetization current path via the demagnetization module 600, the first end of the first secondary side 121, the rectifier circuit 200, and the excitation winding 300, and the current forms another demagnetization current path via the demagnetization module 600, the first end of the second secondary side 122, the rectifier circuit 200, and the excitation winding 300. The two demagnetization current paths jointly act to demagnetize the excitation winding 300.

[0092] FIG. 7b is two demagnetization current paths (as shown by the dashed arrows) of the demagnetization circuit in FIG. 7a in the case that the excitation switch circuit 400 is disconnected. When the demagnetization circuit demagnetizes the excitation winding 300, the drive control circuit 500 controls the excitation switch circuit 400 to be off, and the current of the excitation winding 300 continues to flow. In one current continuation path, the current after current continuation flows via the first demagnetization element 610 and the first rectification element 211 back to the excitation winding 300. In another current continuation path, the current after current continuation flows via the second demagnetization element 620 and the second rectification element 212 back to the excitation winding 300. The voltage across the excitation winding 300 is clamped by the first demagnetization element 610 and the second demagnetization element 620, so that the excitation winding 300 is demagnetized.

[0093] FIG. 7c is an equivalent circuit of the secondary side of the demagnetization circuit in FIG. 7a during demagnetization. In combination with FIG. 7d, when the system demagnetizes at time t, the output voltage jumps from Uol to Uo2. The expression of the output current of the demagnetization circuit during demagnetization can be obtained, and the output current of the secondary side winding of the transformer is:

[0094] wherein Uo2 is the voltage across the demagnetization module 600. By adding the demagnetization elements (for example, the first demagnetization element 610 and the second demagnetization element 620) in the demagnetization module 600, a large reverse voltage is provided for the excitation winding 300 when fast demagnetization is needed, so that the energy stored in the excitation inductance of the excitation winding 300 is quickly consumed, the fast demagnetization of the circuit is completed, and the higher the clamping voltage UTVS of the demagnetization module 600, the faster the demagnetization speed of the excitation winding 300.

[0095] In some embodiments, in combination with FIG. 8, the first secondary side 121 and the second secondary side 122 are connected in series, and the demagnetization module 600 can be connected only between the first end of the first secondary side 121 and the demagnetization node B. The common node of the first secondary side 121 and the second secondary side 122 is connected with the excitation switch circuit 400.

[0096] In the embodiment, the secondary winding of the transformer 100 includes a first secondary winding 121 and a second secondary winding 122, the first secondary winding 121 and the second secondary winding 122 are connected in series, the demagnetization module 600 is connected between a first end of the first secondary winding 121 and the demagnetization node B, and in the case that the excitation switch circuit 400 is disconnected, a current forms a demagnetization current path via the demagnetization module 600, the first end of the first secondary winding 121, the rectifier circuit 200 and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0097] In some embodiments, the secondary winding of the transformer 100 further includes a second secondary winding 122, the first secondary winding 121 and the second secondary winding 122 are connected in series, the demagnetization module 600 is connected between a first end of the second secondary winding 122 and the demagnetization node B, and a common node of the first secondary winding 121 and the second secondary winding 122 is connected with the excitation switch circuit 400.

[0098] In the embodiment, as shown in FIG. 9, the demagnetization module 600 includes a second demagnetization element 620, the second demagnetization element 620 is connected between a first end of the second secondary winding 122 of the transformer 100 and the demagnetization node B, and in the case that the excitation switch circuit 400 is disconnected, a current forms a demagnetization current path via the demagnetization module 600, the first end of the second secondary winding 122, the rectifier circuit 200 and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0099] In some embodiments, the second demagnetization element 620 can also be connected between a second end of the second secondary winding 122 of the transformer 100 and the demagnetization node B, at this time, the second end of the second secondary winding 122 is connected with the second end of the first secondary winding 121, and in the case that the excitation switch circuit 400 is disconnected, a current forms a demagnetization current path via the demagnetization module 600, the second end of the second secondary winding 122, the rectifier circuit 200 and the excitation winding 300, so as to demagnetize the excitation winding 300.

[0100] In some embodiments, the rectifier circuit 200 can be a half-bridge rectifier circuit, as shown in FIG. 9, the rectifier circuit 200 includes a first rectifier element 211 and a second rectifier element 212, an anode of the first rectifier element 211 is connected with a first end A1 of the secondary winding, a cathode of the first rectifier element 211 is connected with the excitation winding 300, an anode of the second rectifier element 212 is connected with a second end A2 of the secondary winding, and a cathode of the second rectifier element 212 is connected with the excitation winding 300.

[0101] In some embodiments, the first demagnetization element 610 includes at least one transient voltage suppression diode.

[0102] In the embodiment, the demagnetization node B is arranged on a line between the excitation switch circuit 400 and the excitation winding 300, the driving control circuit 500 controls the switch state of the excitation switch circuit 400, the first end of the transient voltage suppression diode is connected to the secondary winding as the first end of the first demagnetization element 610, the second end of the transient voltage suppression diode is connected to the demagnetization node B as the second end of the first demagnetization element 610, and the transient voltage suppression diode is turned on when the excitation switch circuit 400 is turned off, so that the excitation winding 300 can be voltage clamped in the demagnetization process, the discharge of the magnetic field energy in the excitation winding 300 is accelerated, the demagnetization time is further shortened, and the rectifier devices and the load 700 of the secondary winding are protected at the same time, and the reliability of the circuit is improved.

[0103] In some embodiments, the first demagnetization element 610 includes a plurality of transient voltage suppression diodes, which can be connected in series or in parallel.

[0104] In some embodiments, the first demagnetization element 610 includes a unidirectional transient voltage suppression diode and a diode, which are connected in series.

[0105] In some embodiments, as shown in FIG. 10, the first demagnetization element 610 can be composed of a unidirectional transient voltage suppression diode 611 and a diode 612 connected in common cathode, and the second demagnetization element 620 can be composed of a unidirectional transient voltage suppression diode 621 and a diode 622 connected in common cathode.

[0106] In the embodiment, the first demagnetization element 610 and the second demagnetization element 620 are composed of a unidirectional TVS tube and a diode connected in series, and the diode is used to prevent the unidirectional TVS from being turned on by positive voltage during excitation, causing output short circuit; the use of the unidirectional TVS tube is conducive to reducing the cost of the circuit.

[0107] In some embodiments, as shown in FIG. 11, the first demagnetization element 610 can be composed of a unidirectional transient voltage suppression diode 611 and a diode 612 connected in common anode, and the second demagnetization element 620 can be composed of a unidirectional transient voltage suppression diode 621 and a diode 622 connected in common anode.

[0108] In some embodiments, the rectifier circuit 200 is any one of a full-wave rectifier, a full-bridge rectifier, a half-wave rectifier, and a voltage doubler rectifier.

[0109] In some embodiments, the driving control circuit 500 is configured to receive a demagnetization control signal and generate a switch driving signal according to the demagnetization control signal to drive the excitation switch circuit 400 to be turned on or turned off.

[0110] In the embodiment, the drive control circuit 500 can independently control the switch state of the excitation switch circuit 400. By providing a demagnetization control signal to the drive control circuit 500, the drive control circuit 500 generates a corresponding switch drive signal to drive the excitation switch circuit 400 to be turned off according to the demagnetization control signal. In the case of the excitation switch circuit 400 being turned off, the current forms a demagnetization current path via the demagnetization module 600, the first end A1 or the second end of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so that the voltage across the excitation winding 300 is clamped in a specified voltage range, and the excitation winding 300 is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0111] In some embodiments, the drive control circuit 500 is connected between the secondary winding and the excitation switch circuit 400. The drive control circuit 500 generates a switch drive signal according to the current on the secondary winding to drive the excitation switch circuit 400 to be turned on or turned off.

[0112] In the embodiment, the drive control circuit 500 can monitor the current on the secondary winding and generate a switch drive signal according to the current on the secondary winding. When the current on the secondary winding meets certain conditions, a corresponding switch drive signal is generated to drive the excitation switch circuit 400 to be turned off. In the case of the excitation switch circuit 400 being turned off, the current forms a demagnetization current path via the demagnetization module 600, the first end A1 or the second end of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so that the voltage across the excitation winding 300 is clamped in a specified voltage range, and the excitation winding 300 is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0113] In some embodiments, referring to FIG. 12, the drive control circuit 500 includes a first voltage dividing resistor 501, a second voltage dividing resistor 502, and a first capacitor 503. One end of the first voltage dividing resistor 501 is connected to one end of the secondary winding. The second end of the first voltage dividing resistor 501, the first end of the second voltage dividing resistor 502, and the first end of the first capacitor 503 are commonly connected to the control end of the excitation switch circuit 400. The second end of the second voltage dividing resistor 502 and the second end of the first capacitor 503 are commonly connected to the first end of the excitation switch circuit 400.

[0114] In the embodiment, the excitation switch circuit 400 is controlled by the current of the secondary winding of the transformer 100, the current on the secondary winding flows through the first voltage dividing resistor 501, the second voltage dividing resistor 502, and the first capacitor 503, the first voltage dividing resistor 501 and the second voltage dividing resistor 502 form a voltage dividing circuit, when the current on the secondary winding meets certain conditions, the voltage signal output by the voltage dividing circuit generates a corresponding switch driving signal via the first capacitor 503, the corresponding switch driving signal drives the excitation switch circuit 400 to be disconnected, in the case of the excitation switch circuit 400 being disconnected, the current forms a demagnetization current path via the demagnetization module 600, the first end A1 or the second end of the secondary winding, the rectifier circuit 200, and the excitation winding 300, so that the voltage across the excitation winding 300 is clamped in a specified voltage range, and the excitation winding 300 is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0115] In some embodiments, as shown in FIG. 12, the excitation switch circuit 400 includes a driving switch element 410, a diode 420, and a capacitor 430, the driving switch element 410 is an N-type MOS tube, the cathode of the diode 420, the first end of the capacitor 430, and the drain of the N-type MOS tube are connected to the load 700, the anode of the diode 420, the second end of the capacitor 430, and the drain of the N-type MOS tube are connected to the rectifier circuit 200, and the gate of the N-type MOS tube is connected to the driving control circuit 500.

[0116] In some embodiments, the transformer 100 further includes an auxiliary secondary winding, as shown in FIG. 13, the driving control circuit 500 includes a first diode 511, a second capacitor 512, a third voltage dividing resistor 513, and a fourth voltage dividing resistor 514, the anode of the first diode 511 is connected to the first end A1 of the auxiliary secondary winding, the cathode of the first diode 511, the first end of the second capacitor 512, and the first end of the third voltage dividing resistor 513 are connected, the second end of the third voltage dividing resistor 513 and the first end of the fourth voltage dividing resistor 514 are connected to the control end of the excitation switch circuit 400, and the second end of the second capacitor 512, the second end of the fourth voltage dividing resistor 514, and the second end A2 of the auxiliary secondary winding are connected to the first end of the excitation switch circuit 400.

[0117] In the embodiment, the first diode 511 and the second capacitor 512 form a half-wave rectifier circuit, the third voltage dividing resistor 513 is used to adjust the driving voltage of the demagnetization switch, the transformer 100 includes a first secondary winding 121 and an auxiliary secondary winding 516, the auxiliary secondary winding 516 and the first diode 511 form an induction circuit, the current of the primary winding 110 of the transformer 100 is output as a corresponding induction current through the induction circuit, the induction current is output as a corresponding switch driving signal through a voltage dividing circuit formed by the third voltage dividing resistor 513 and the fourth voltage dividing resistor 514, when the current on the primary winding meets a certain condition, the switch driving signal drives the excitation switch circuit 400 to be turned off, in the case that the excitation switch circuit 400 is turned off, the current forms a demagnetization current path through the demagnetization module 600, the first end or the second end of the first secondary winding 121, the rectifier circuit 200 and the excitation winding 300, so that the voltage across the excitation winding 300 is clamped in a specified voltage range, and the excitation winding 300 is rapidly demagnetized, which can significantly improve the demagnetization speed.

[0118] In some embodiments, the drive control circuit 500 further includes a voltage stabilizing tube 515 for protecting the demagnetization switch circuit.

[0119] The embodiment of the present application further provides an electric machine assembly, which includes an electric machine rotor, an electronic stator and a demagnetization circuit according to any one of the above embodiments.

[0120] The embodiment of the present application further provides a vehicle system, which includes the demagnetization circuit according to any one of the above embodiments.

[0121] The embodiment of the present application further provides a vehicle system, which includes the electric machine assembly according to any one of the above embodiments, and the electric machine assembly is arranged in a synchronous generator or a synchronous motor.

[0122] In the embodiment, the secondary winding of the transformer in the automobile interior is connected to the input end of the rectifier circuit, the output end of the rectifier circuit, the excitation winding and the excitation switch circuit are connected in series, and the demagnetization module is connected between the demagnetization node and the secondary winding of the transformer. By arranging the demagnetization node on the line between the excitation switch circuit and the excitation winding, the switch state of the excitation switch circuit is controlled by the drive control circuit, so that the demagnetization module can rapidly demagnetize the excitation winding when the excitation switch circuit is turned off. In the demagnetization process, the excitation winding is voltage-clamped by the demagnetization module, which accelerates the discharge of the magnetic field energy in the excitation winding, further shortens the demagnetization time, and at the same time protects the rectifier devices and the load of the secondary winding, thereby improving the reliability of the circuit.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is taken as an example for description, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the units and modules in the system can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0124] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0125] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0126] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0127] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0128] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A demagnetization circuit, wherein: include: Transformer, rectifier circuit, demagnetization module, excitation winding, excitation switch circuit, drive control circuit; The secondary winding of the transformer is connected to the input end of the rectifier circuit, the output end of the rectifier circuit, the excitation winding and the excitation switch circuit are connected in series, and the excitation switch circuit is controlled by the drive control circuit; The demagnetization module is connected between the demagnetization node and the secondary winding of the transformer; wherein the demagnetization node is located on the line between the excitation switching circuit and the excitation winding, and the demagnetization module is used to demagnetize the excitation winding when the excitation switching circuit is turned off.

2. The demagnetization circuit according to claim 1, wherein: The demagnetization module is connected between the first end and / or the second end of the secondary winding of the transformer and the demagnetization node.

3. The demagnetization circuit according to claim 2, wherein: The secondary winding of the transformer includes a first secondary side, and the demagnetization module is connected between a first end and / or a second end of the first secondary side and the demagnetization node.

4. The demagnetization circuit according to claim 3, wherein: The secondary winding of the transformer also includes a second secondary side, the demagnetization module is connected between the first end and / or the second end of the second secondary side and the demagnetization node, the first secondary side and the second secondary side are connected in series, and a common node between the first secondary side and the second secondary side is connected to the excitation switching circuit.

5. The demagnetization circuit according to claim 1, wherein The demagnetization module includes a first demagnetization element connected between a first end of the secondary winding of the transformer and the demagnetization node.

6. The demagnetization circuit according to claim 1, wherein: The demagnetization module further includes a second demagnetization element connected between the second end of the secondary winding of the transformer and the demagnetization node.

7. The demagnetization circuit according to claim 1, wherein: The demagnetization module includes at least one transient voltage suppressor diode.

8. The demagnetization circuit according to claim 1, wherein: The demagnetization module includes a unidirectional transient suppression diode and a diode, wherein the unidirectional transient suppression diode is connected in series with the diode to share a common anode or a common cathode.

9. The demagnetization circuit according to any one of claims 1 to 8, wherein: The rectifier circuit is any one of a full-wave rectifier, a full-bridge rectifier, a half-wave rectifier, and a voltage doubler rectifier.

10. The demagnetization circuit according to any one of claims 1 to 8, wherein: The drive control circuit is used to receive a demagnetization control signal and generate a switch drive signal according to the demagnetization control signal to drive the excitation switch circuit to be turned on or off.

11. The demagnetization circuit according to any one of claims 1 to 8, wherein: The drive control circuit is connected between the secondary winding and the excitation switch circuit; The drive control circuit generates a switch drive signal according to the current on the secondary winding to drive the excitation switch circuit to be turned on or off.

12. The demagnetization circuit according to any one of claims 1 to 8, wherein: The drive control circuit includes: a first voltage-dividing resistor, a second voltage-dividing resistor, and a first capacitor. The first end of the first voltage-dividing resistor is connected to one end of the secondary winding, the second end of the first voltage-dividing resistor, the first end of the second voltage-dividing resistor, and the first end of the first capacitor are commonly connected to the control end of the excitation switch circuit, and the second end of the second voltage-dividing resistor and the second end of the first capacitor are commonly connected to the first end of the excitation switch circuit.

13. The demagnetization circuit according to any one of claims 1 to 8, wherein: The transformer further includes an auxiliary secondary winding; The drive control circuit includes: a first diode, a second capacitor, a third voltage-dividing resistor, and a fourth voltage-dividing resistor. The anode of the first diode is connected to the first end of the auxiliary secondary winding, the cathode of the first diode, the first end of the second capacitor, and the first end of the third voltage-dividing resistor are commonly connected, the second end of the third voltage-dividing resistor and the first end of the fourth voltage-dividing resistor are commonly connected to the control end of the excitation switch circuit, and the second end of the second capacitor, the second end of the fourth voltage-dividing resistor, and the second end of the auxiliary secondary winding are commonly connected to the first end of the excitation switch circuit.

14. A motor assembly, wherein: The motor assembly comprises a motor rotor, an electronic stator, and a demagnetization circuit according to any one of claims 1 to 13; The excitation winding is arranged on the motor rotor or the electronic stator.

15. A vehicle system, wherein: The vehicle system includes the demagnetization circuit according to any one of claims 1 to 13; or includes the motor assembly according to claim 14, wherein the motor assembly is arranged in a synchronous generator or a synchronous motor.

Images