Power system, magnetic induction component, magnetic induction intensity detection device, and transformer

Abstract

The present application provides a power system, a magnetic induction component, a magnetic induction intensity detection device, and a transformer, which can suppress the generation of inrush current. The power system includes a first switch, a transformer, a magnetic induction component, and a control circuit; a first end of the first switch is coupled to a first power source, and a second end of the first switch is coupled to an electrical load through the transformer; the magnetic induction component generates a voltage parameter under the induction of the residual magnetic induction intensity of the transformer and sends the voltage parameter to the control circuit; the voltage parameter is used for the control circuit to determine the residual magnetic induction intensity of the transformer; the control circuit determines at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer; the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the residual magnetic induction intensity; the first switch is controlled so that the initial voltage of the alternating current input to the transformer is any one of the at least one target input voltages.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and in particular to power systems, magnetic induction components, magnetic induction intensity detection devices, and transformers. Background Art

[0002] Generally, a power system includes a transformer. Due to the residual magnetic induction intensity existing in the magnetic core of the transformer, when the transformer is put into operation, the magnetic induction intensity of the magnetic core of the transformer is saturated, causing an impact current, that is, an inrush current is generated. The inrush current will not only increase the heat generation of the magnetic core of the transformer, but also affect the service life of the transformer. Moreover, the inrush current contains a large number of high-order harmonics, which affect the power quality of the power system.

[0003] Existing solutions generally weaken the inrush current generated when the transformer is put into operation by changing the internal structure of the transformer. Or a resistor is connected in series outside the transformer to weaken the inrush current generated when the transformer is put into operation. Whether the existing solution changes the internal structure of the transformer or changes the external structure of the transformer, it can only weaken the influence of the inrush current and cannot eliminate the phenomenon of generating the inrush current. Summary of the Invention

[0004] This application provides a power system, a magnetic induction component, a magnetic induction intensity detection device, and a transformer, which can suppress the generation of inrush current.

[0005] In a first aspect, an embodiment of this application provides a power system, which may include a first switch, a transformer, a magnetic induction component, and a control circuit. The first end of the first switch is coupled to a first power supply, and the second end of the first switch is coupled to an electrical load through the transformer. The first power supply can provide alternating current to the power system. The magnetic induction component can be used to generate a voltage parameter under the induction of the residual magnetic induction intensity of the transformer, and send the voltage parameter to the control circuit, and the voltage parameter is used for the control circuit to determine the residual magnetic induction intensity of the transformer. The control circuit can be used to determine at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer set, where the first magnetic induction intensity corresponding to the target input voltage is the same as the residual magnetic induction intensity in magnitude and opposite in direction. Control the first switch to make the initial voltage of the alternating current input to the transformer be any one of the at least one target input voltages.

[0006] In the embodiment of the present application, the voltage parameter provided by the magnetic induction component in the power system can be used by the control circuit to determine the remaining magnetic induction intensity of the transformer. The control circuit can control the first switch. After the first switch is turned on, the initial voltage of the alternating current input to the transformer can be the target input voltage. The magnetic induction intensity generated by the transformer under the action of the target input voltage is the first magnetic induction intensity corresponding to the target input voltage, and the magnitude of the first magnetic induction intensity is the same as that of the remaining magnetic induction intensity, and the directions are opposite, so that the total magnetic induction intensity of the transformer when it is put into operation is zero, which is less than the saturation magnetic induction intensity of the transformer. Therefore, the transformer will not generate inrush current.

[0007] In a possible design, when the magnetic induction component includes a Hall element, the voltage parameter represents the voltage formed by the working current in the Hall element under the action of the remaining magnetic induction intensity of the transformer; or when the magnetic induction component includes a magnetoresistive circuit, the equivalent resistance of the magnetoresistive circuit changes under the action of the remaining magnetic induction intensity of the transformer, where the ratio of the working voltage of the magnetoresistive circuit to the voltage parameter represents the change amount of the equivalent resistance of the magnetoresistive circuit.

[0008] In the embodiment of the present application, the magnetic induction component may include a Hall element or a magnetoresistive circuit. The voltage parameter provided by the magnetic induction component can represent the Hall voltage formed by the Hall element under the action of the remaining magnetic induction intensity of the transformer. Or it can represent the change amount of the equivalent resistance of the magnetoresistive circuit. It can be seen that in the power system, the control circuit and the magnetic induction component can jointly detect the remaining magnetic induction intensity of the transformer.

[0009] In a possible design, the magnetic induction component includes a Hall element. The control circuit can also determine the magnetic induction intensity corresponding to the voltage parameter as the remaining magnetic induction intensity of the transformer based on the relationship between the set voltage of the Hall element, the working current, and the magnetic induction intensity. In the power system provided by the embodiment of the present application, the control circuit and the magnetic induction component can jointly detect the remaining magnetic induction intensity of the transformer.

[0010] In a possible design, the magnetic induction component includes a magnetoresistive circuit. The control circuit can also determine the magnetic induction intensity corresponding to the target change amount as the remaining magnetic induction intensity of the transformer based on the relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity set, where the target change amount is the ratio of the voltage parameter to the working voltage of the magnetoresistive circuit. In the power system provided by the embodiment of the present application, the control circuit and the magnetic induction component can jointly detect the remaining magnetic induction intensity of the transformer.

[0011] In a possible way, the control circuit is further configured to: after determining at least one target input voltage and before controlling the first switch, determine the closing moment of the first switch, where the initial voltage of the alternating current is the same as any of the target input voltages at the closing moment; when the control circuit controls the first switch, it is specifically configured to: control the first switch to be in a conducting state at the closing moment.

[0012] In a second aspect, an embodiment of the present application further provides a power system, which may include a transformer, an inverter circuit, a magnetic induction component, and a control circuit. One end of the transformer is coupled to the inverter circuit, and the other end is coupled to an electrical load. The inverter circuit can output alternating current under the control of the control circuit. The transformer can convert the power of the alternating current provided to the inverter circuit and then provide it to the electrical load. The magnetic induction component can generate a voltage parameter under the induction of the remaining magnetic induction intensity of the transformer and send the voltage parameter to the control circuit, and the voltage parameter is used for the control circuit to determine the remaining magnetic induction intensity of the transformer. The control circuit can determine a target output voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer set, where the first magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the remaining magnetic induction intensity, and the maximum magnetic induction intensity of the transformer is less than the saturation magnetic induction intensity of the transformer. Control the inverter circuit so that the initial voltage of the alternating current output by the inverter circuit is the target output voltage.

[0013] In the embodiment of the present application, the voltage parameter provided by the magnetic induction component in the power system can be used for the control circuit to determine the remaining magnetic induction intensity of the transformer. The control circuit can control the inverter circuit so that the output voltage of the inverter circuit is the target output voltage. The magnetic induction intensity generated by the transformer under the action of the target output voltage is the first magnetic induction intensity. The sum of the first magnetic induction intensity and the remaining magnetic induction intensity of the transformer is the maximum magnetic induction intensity of the transformer, which is less than the saturation magnetic induction intensity of the transformer. It is realized that the magnetic induction intensity when the transformer is put into operation is less than the saturation magnetic induction intensity, so that the transformer will not generate inrush current.

[0014] In a possible design, when the magnetic induction component includes a Hall element, the voltage parameter represents the voltage formed by the working current in the Hall element under the action of the remaining magnetic induction intensity of the transformer; or when the magnetic induction component includes a magnetoresistive circuit, the equivalent resistance of the magnetoresistive circuit changes under the action of the remaining magnetic induction intensity of the transformer, and the ratio of the working voltage of the magnetoresistive circuit to the voltage parameter represents the change amount of the equivalent resistance of the magnetoresistive circuit.

[0015] In the embodiments of the present application, the magnetic induction component may include a Hall element or a magnetoresistive circuit. The voltage parameter provided by the magnetic induction component may represent the Hall voltage formed by the Hall element under the action of the residual magnetic induction intensity of the transformer. Or it may represent the change amount of the equivalent resistance of the magnetoresistive circuit. It can be seen that in the power system, the control circuit and the magnetic induction component can jointly detect the residual magnetic induction intensity of the transformer.

[0016] In a possible design, the magnetic induction component includes a Hall element. The control circuit is further configured to: based on the relationship between the voltage, the operating current, and the magnetic induction intensity of the set Hall element, determine the magnetic induction intensity corresponding to the voltage parameter as the residual magnetic induction intensity of the transformer. In the power system provided by the embodiments of the present application, the control circuit and the magnetic induction component can jointly detect the residual magnetic induction intensity of the transformer.

[0017] In a possible design, the magnetic induction component includes a magnetoresistive circuit. The control circuit is further configured to determine the magnetic induction intensity corresponding to the target change amount as the residual magnetic induction intensity of the transformer based on the relationship between the change amount of the equivalent resistance of the set magnetoresistive circuit and the magnetic induction intensity, where the target change amount is the ratio of the voltage parameter to the operating voltage of the magnetoresistive circuit. In the power system provided by the embodiments of the present application, the control circuit and the magnetic induction component can jointly detect the residual magnetic induction intensity of the transformer.

[0018] In a third aspect, an embodiment of the present application further provides a power system, including: a first power supply branch, a second power supply branch, a first switch, a second switch, a transformer, a magnetic induction component, and a control circuit. The first power supply branch is coupled to a first power source, and the first power supply branch is coupled to a user load through the first switch; the first power source is capable of providing a first alternating current to the first power supply branch; the first power supply branch is configured to transmit the first alternating current to the first switch. The second power supply branch is coupled to a second power source; the second power supply branch is coupled to one end of the transformer through the second switch; the other end of the transformer is coupled to the user load; the second power source is capable of providing a first direct current to the second power supply branch; the second power supply branch is configured to convert the first direct current into a second alternating current and then transmit it to the second switch. The magnetic induction component is configured to generate a voltage parameter under the induction of the remaining magnetic induction intensity of the transformer, and send the voltage parameter to the control circuit, and the voltage parameter is used for the control circuit to determine the remaining magnetic induction intensity of the transformer. The control circuit can be configured to determine at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer set, wherein the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the remaining magnetic induction intensity; control the first switch to make the initial voltage of the first alternating current input to the transformer be any one of the at least one target input voltages; or, the control circuit can determine the target output voltage of the second power supply branch based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer set, wherein the second magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the remaining magnetic induction intensity, and the maximum magnetic induction intensity of the transformer is less than the saturation magnetic induction intensity of the transformer; control the second power supply branch to make the initial voltage of the second alternating current output by the second power supply branch be the target output voltage.

[0019] In the embodiments of the present application, the voltage parameter provided by the magnetic induction component in the power system can be used by the control circuit to determine the remaining magnetic induction intensity of the transformer. When the first power supply powers the electrical load, the control circuit can control the first switch. After the first switch is turned on, the initial voltage of the alternating current input to the transformer can be the target input voltage. The magnetic induction intensity generated by the transformer under the action of the target input voltage is the first magnetic induction intensity corresponding to the target input voltage, and the magnitude of the first magnetic induction intensity is the same as that of the remaining magnetic induction intensity, and the directions are opposite, so that the total magnetic induction intensity of the transformer when it is put into operation is zero, which is less than the saturation magnetic induction intensity of the transformer. Therefore, the transformer will not generate inrush current. When the second power supply powers the electrical load, the control circuit can control the inverter circuit to make the output voltage of the inverter circuit be the target output voltage. The magnetic induction intensity generated by the transformer under the action of the target output voltage is the first magnetic induction intensity. The sum of the first magnetic induction intensity and the remaining magnetic induction intensity of the transformer is the maximum magnetic induction intensity of the transformer, which is less than the saturation magnetic induction intensity of the transformer. It is realized that the magnetic induction intensity when the transformer is put into operation is less than the saturation magnetic induction intensity, so that the transformer will not generate inrush current.

[0020] In a possible design, the first power supply includes one or more of an AC power grid or a first energy conversion device; the first energy conversion device is used to convert non-electric energy into AC electric energy.

[0021] In a possible design, when the first power supply includes the AC power grid and the first energy conversion device, the first power supply branch further includes a switching module; the switching module is respectively coupled to the AC power grid and the first energy conversion device, and is coupled to the first switch. The switching module is used to output the first alternating current provided by the AC power grid or the first alternating current provided by the first energy conversion device to the first switch.

[0022] In a possible design, the second power supply branch includes an inverter circuit; the inverter circuit is used to convert the direct current provided by the second power supply into the second alternating current.

[0023] In a possible design, the second power supply includes one or more of a second energy conversion device and an energy storage device; the second energy conversion device is used to convert non-electric energy into direct current and provide it to the inverter circuit; the energy storage device is used to provide direct current to the inverter circuit.

[0024] Fourthly, an embodiment of the present application further provides a magnetic induction component, which may include a Hall element and a processing circuit; wherein, the Hall element is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; the processing circuit can be used to provide a set working current to the Hall element; wherein, the current direction of the working current is perpendicular to the magnetic induction intensity direction when the transformer works, and under the action of the residual magnetic induction intensity of the transformer, a first voltage is formed at the Hall element; the first ratio of the first voltage to the working current has a linear relationship with the residual magnetic induction intensity. The first voltage is sent to a controller communicatively connected to the processing circuit, and the first voltage is used for the controller to determine the residual magnetic induction intensity of the transformer.

[0025] In a possible design, the ratio of the first ratio to the residual magnetic induction intensity is the same as the second ratio of the Hall coefficient of the Hall element to the thickness of the Hall element.

[0026] Fifthly, an embodiment of the present application provides a magnetic induction component, which may include a magnetoresistive circuit and a processing circuit. The magnetoresistive circuit is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; the magnetoresistive circuit includes a first series branch formed by series connection of a first magnetoresistor and a second magnetoresistor and a second series branch formed by series connection of a third magnetoresistor and a fourth magnetoresistor; the first end of the first series branch is connected to the first end of the second series branch, and the second end of the first series branch and the second end of the second series branch are respectively grounded; the first end of the first series branch is configured to receive a working voltage provided by the processing circuit; the processing circuit can provide a set working voltage to the magnetoresistive circuit; a voltage difference is collected, and the voltage difference is the difference between a first voltage at one end where the first magnetoresistor and the second magnetoresistor are connected and a second voltage at one end where the third magnetoresistor and the fourth magnetoresistor are connected; wherein, the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, and the change amount of the equivalent resistance of the magnetoresistive circuit is the same as the ratio of the voltage difference to the working voltage; the change amount has a linear relationship with the residual magnetic induction intensity; the voltage difference is sent to a controller communicatively connected to the processing circuit, and the voltage difference is used for the controller to determine the residual magnetic induction intensity of the transformer.

[0027] In a possible design, the magnetoresistive circuit includes one or more of a tunneling magnetoresistance sensor magnetoresistance (TMR), an anisotropic magnetoresistance (AMR), and a giant magnetoresistance (GMR).

[0028] Sixth aspect, an embodiment of the present application provides a magnetic induction intensity detection device, including a magnetic induction component and a controller; the Hall element of the magnetic induction component is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; the magnetic induction component is configured to send a first voltage, where the first voltage represents a voltage formed by the working current in the Hall element under the action of the residual magnetic induction intensity of the transformer; the controller can receive the first voltage; based on the relationship between the voltage, the working current, and the magnetic induction intensity of the set Hall element, the magnetic induction intensity corresponding to the first voltage is determined as the residual magnetic induction intensity of the transformer.

[0029] In a possible design, the magnetic induction component is the magnetic induction component as described in the fourth aspect and any of its designs.

[0030] Seventh aspect, an embodiment of the present application provides a magnetic induction intensity detection device, including a magnetic induction component and a controller; the magnetoresistive circuit of the magnetic induction component is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; the magnetic induction component is configured to send a voltage parameter; the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, where the change amount of the equivalent resistance of the magnetoresistive circuit is the same as the ratio of the voltage parameter to the working voltage of the magnetoresistive circuit; the controller can receive the voltage parameter; based on the linear relationship between the change amount of the equivalent resistance of the set magnetoresistive circuit and the magnetic induction intensity, the magnetic induction intensity corresponding to the change amount is determined as the residual magnetic induction intensity of the transformer.

[0031] In a possible design, the magnetic induction component is the magnetic induction component as described in the fifth aspect and any of its designs.

[0032] Eighth aspect, an embodiment of the present application provides a transformer, including a magnetic core, a primary winding, a secondary winding, and the magnetic induction intensity detection device as described in the sixth aspect and any of its designs or the seventh aspect and any of its designs. The primary winding and the secondary winding are respectively wound around the magnetic core to achieve power conversion; part or all of the magnetic induction intensity detection device is disposed on the magnetic core or in the air gap of the magnetic core for detecting the magnetic induction intensity of the magnetic core. Description of the Drawings

[0033] Figure 1 Shows a schematic structural diagram of a transformer;

[0034] Figure 2 Shows a schematic structural diagram of a magnetic induction component;

[0035] Figure 3 Shows a schematic diagram of the position of the Hall element in a magnetic induction component;

[0036] Figure 4 Shows a schematic structural diagram of a magnetic induction intensity detection component;

[0037] Figure 5 Shows a schematic structural diagram of another magnetic induction component;

[0038] Figure 6 Shows a schematic position diagram of a magnetoresistive circuit in a magnetic induction component;

[0039] Figure 7 Shows a schematic structural diagram of another magnetic induction intensity detection component;

[0040] Figure 8 Shows a schematic structural diagram of a power system;

[0041] Figure 9 Shows a schematic diagram of the relationship between the voltage of an input transformer and the magnetic induction intensity generated by the transformer;

[0042] Figure 10 Shows a schematic structural diagram of another power system;

[0043] Figure 11 Shows a schematic structural diagram of yet another power system;

[0044] Figure 12 Shows a schematic diagram of the working process of a control circuit in a power system. Detailed implementation manners

[0045] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above", "said", "this" are also intended to include the forms such as "one or more", unless clearly indicated to the contrary in the context.

[0046] Referring to "one embodiment" or "some embodiments" described in this specification means that in one or more embodiments of the present application, specific features, structures or characteristics described in connection with that embodiment are included. Thus, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" and the like appearing in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0047] In the description of the present application, "at least one" means one or more, where "multiple" means two or more. In view of this, in the embodiments of the present invention, "multiple" can also be understood as "at least two". "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally represents an "or" relationship between the associated objects before and after. In addition, it should be understood that in the description of the present application, terms such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0048] It should be noted that in the embodiments of the present application, "coupling" can be understood as electrical connection, and the coupling of two electrical components can be direct or indirect coupling between the two electrical components. For example, the coupling of A and B can be either the direct coupling of A and B or the indirect coupling of A and B through one or more other electrical components. For example, for the coupling of A and B, it can also be the direct coupling of A and C and the direct coupling of C and B, and the coupling between A and B is achieved through C. In some scenarios, "coupling" can also be understood as coupling, such as the electromagnetic coupling between two inductors. In short, the coupling between A and B can enable the transmission of electrical energy between A and B.

[0049] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0050] A power system generally includes a transformer. The transformer can perform power conversion on electrical energy and supply the electrical energy after power conversion to an electrical load. As Figure 1 shown, a transformer generally includes a magnetic core, a primary winding, and a secondary winding. The primary winding and the secondary winding are respectively wound around the magnetic core. The primary winding can receive the electrical energy provided by the power source, and the secondary winding outputs the electrical energy after power conversion to the electrical load. As the current in the primary winding increases, the magnetic induction intensity (also called magnetic flux density) of the generated magnetic field also increases. In the embodiments of the present application, the magnetic induction intensity is a vector, having magnitude and direction.

[0051] In a power system, the energization of a transformer can mean that electrical energy is input into the transformer. Before the transformer is energized, it can mean that no electrical energy is input into the transformer. There is a residual magnetic induction intensity (which can also be called the residual magnetic induction intensity of the transformer, and can be understood as the magnetic induction intensity in the transformer core after the transformer coil has no excitation voltage) in the magnetized transformer core. If when the transformer is energized, the voltage input into the transformer causes the magnetic induction intensity generated by the transformer to be Total magnetic flux induction intensity Exceeds the saturation magnetic induction intensity of the magnetic core. Magnetic core saturation will cause the transformer to generate an exciting current, that is, inrush current. The inrush current will flow into the power supply side that inputs electrical energy to the primary winding. The inrush current may cause a tripping protection operation on the power supply side. Generally, the inrush current may also include harmonics, and the harmonics entering the power supply side will pollute the power quality of the power supply side.

[0052] Existing solutions generally weaken the inrush current generated when the transformer is put into operation by changing the internal structure of the transformer. Or connect a resistor in series outside the transformer to weaken the inrush current generated when the transformer is put into operation. Whether the existing solution changes the internal structure of the transformer or the external structure of the transformer, it can only weaken the influence of the inrush current and cannot eliminate the phenomenon of generating inrush current.

[0053] The generation of inrush current is due to the fact that when the transformer is put into the power system, the working voltage input to the transformer is inappropriate, resulting in the sum of the magnetic induction intensity generated by the transformer under the action of the working voltage and the residual magnetic induction intensity of the transformer being greater than the saturation magnetic induction intensity.

[0054] Accurately determining the residual magnetic induction intensity of the transformer helps to adjust the working voltage of the input transformer, avoid the magnetic induction intensity of the transformer being greater than or equal to the saturation magnetic induction intensity, and thus no inrush current will be generated. This application first provides a magnetic induction component for detecting the residual magnetic induction intensity of the transformer. Please refer to Figure 2 , the magnetic induction component may include a Hall element and a first processing circuit. The Hall element is coupled to the first processing circuit.

[0055] The Hall element may include but is not limited to Hall devices, Hall plates, etc. In the embodiments of this application, the Hall element may be an element based on the Hall effect. For example, when the current direction in the Hall element is perpendicular to the external magnetic field direction, the positive and negative carriers in the current accumulate at both ends of the Hall element along the direction of the external magnetic field under the action of the Lorentz force, and finally reach dynamic equilibrium, forming a voltage at both ends of the Hall element, and this voltage can also be called the Hall voltage.

[0056] In the magnetic induction component, the first processing circuit can provide a working current to the Hall element The working current provided by the first processing circuit to the Hall element is perpendicular to the direction of the magnetic induction intensity when the transformer is working. When the transformer is working, it can refer to the primary winding receiving voltage. The direction of the magnetic induction intensity when the transformer is working can be the magnetic induction intensity generated under the action of the voltage after the source winding of the transformer receives the voltage.

[0057] The working current in the Hall element The positive and negative carriers of Under the action of , a Hall voltage is formed across the Hall element. And the Hall voltage The relationship with the residual magnetic induction intensity of the transformer is where Rh is the Hall coefficient of the Hall element, d is the thickness of the Hall element, is the working current of the Hall element, is the Hall voltage, is the residual magnetic induction intensity of the transformer.

[0058] The first processing circuit can detect (or collect) the Hall voltage across the Hall element Using the detected Hall voltage The Hall coefficient Rh of the Hall element, the thickness d of the Hall element, the working current of the Hall element can determine the residual magnetic induction intensity of the transformer

[0059] In some application scenarios, the working current provided by the first processing circuit to the Hall element is a preset current The Hall coefficient and thickness of the Hall element in the magnetic induction component are fixed values. The Hall voltage and the working current The ratio of with the residual magnetic induction intensity of the transformer has a linear relationship, that is

[0060] It can be seen that in the magnetic induction component provided by the embodiment of the present application, the Hall voltage collected by the first processing circuit can be used to determine the residual magnetic induction intensity of the transformer To improve the detection accuracy or detection effect, the Hall element in the magnetic induction component can be arranged on the magnetic core of the transformer (as shown in (a) of Figure 3 ), or the Hall element can be arranged in the air gap of the magnetic core (as shown in (b) of Figure 3 ). In some scenarios, the magnetic induction component can be arranged on the magnetic core of the transformer or in the air gap of the magnetic core.

[0061] In a possible implementation manner, the first processing circuit can be communicatively connected to a controller (or a processor). In the embodiment of the present application, the communicative connection can include but is not limited to wireless communicative connection and wired communicative connection. The wireless communication can be a communication method implemented based on any wireless communication technology. The wired communication includes but is not limited to bus communication.

[0062] The controller can be the controller of the power system to which the magnetic induction component belongs, or can be the controller of the magnetic induction intensity detection device to which the magnetic induction component belongs. The controller can pre-acquire the parameters of the Hall element in the magnetic induction component. The parameters of the Hall element can include, but are not limited to, the Hall coefficient Rh, thickness d, operating current, etc. of the Hall element. The controller can obtain the parameters of the Hall element by interacting with the magnetic induction component. Alternatively, the controller can pre-store the parameters of the Hall element. The embodiments of the present application do not impose excessive limitations on the manner in which the controller obtains the parameters of the Hall element. and other information. The controller can obtain the parameters of the Hall element by interacting with the magnetic induction component. Alternatively, the controller can pre-store the parameters of the Hall element. The embodiments of the present application do not impose excessive limitations on the manner in which the controller obtains the parameters of the Hall element.

[0063] In some examples, as Figure 2 shown, the first processing circuit can include a power supply module, a voltage acquisition module, and a control module. The control module can be communicatively connected to the controller and interact with the controller. The control module can control the power supply module to provide an operating current to the Hall element The control module can control the voltage acquisition module to acquire the Hall voltage of the Hall element

[0064] The Hall voltage provided by the magnetic induction component provided by the embodiments of the present application is beneficial to determining the residual magnetic induction intensity of the transformer, thereby facilitating adjusting the operating voltage provided to the transformer according to the residual magnetic induction intensity of the transformer in the power system and suppressing the inrush current. To facilitate differentiation from other magnetic induction components, the magnetic induction component provided by the embodiments of the present application can be a magnetic induction component based on the Hall effect.

[0065] It should be noted that in the embodiments of the present application, taking the external magnetic field as the residual magnetic induction intensity of the transformer as an example is only used to introduce the working process of the magnetic induction component, and does not specifically limit the application scenario of the magnetic induction component or the detection object as the transformer. The magnetic induction component provided by the embodiments of the present application can also be applied to other scenarios or detection objects.

[0066] Based on the magnetic induction component provided by the above embodiments, the embodiments of the present application provide a magnetic induction detection device, which can be applied to the magnetic induction intensity of an external magnetic field, such as detecting the residual magnetic induction intensity of a transformer. As Figure 4 shown, the magnetic induction detection device can include a first magnetic induction component and a first controller. The Hall element of the first magnetic induction component is disposed on the magnetic core of the transformer or in the air gap of the magnetic core.

[0067] The first magnetic induction component is used to send a first voltage, and the first voltage represents the voltage formed by the operating current in the Hall element under the action of the residual magnetic induction intensity of the transformer That is, the Hall voltage across the aforementioned Hall element. The residual magnetic induction intensity of the transformer represents the magnetic induction intensity when the transformer is not operating.

[0068] The controller can receive the first voltage, and then determine the magnetic induction intensity corresponding to the first voltage as the residual magnetic induction intensity of the transformer based on the relationship between the voltage of the Hall element, the operating current of the Hall element, and the magnetic induction intensity set.

[0069] For example, the relationship between the voltage of the Hall element, the operating current of the Hall element, and the magnetic induction intensity set can be where Rh is the Hall coefficient of the Hall element, d is the thickness of the Hall element, is the operating current of the Hall element, is the Hall voltage, is the residual magnetic induction intensity of the transformer.

[0070] The controller can determine the first voltage according to the relationship between the voltage of the Hall element, the operating current of the Hall element, and the magnetic induction intensity set corresponding magnetic induction intensity that is, the residual magnetic induction intensity of the transformer

[0071] In a possible implementation manner, the first magnetic induction component in the magnetic induction detection device can be any one of the magnetic induction components based on the Hall effect provided in the foregoing embodiments.

[0072] In some possible implementation manners, the controller can be communicatively connected to the first magnetic induction component to interact with the parameters of the Hall element in the first magnetic induction component, such as the Hall coefficient, thickness, and operating current. Or the controller can pre-store the parameters of the Hall element in the first magnetic induction component.

[0073] The magnetic induction intensity detection device provided in the embodiments of the present application can detect the residual magnetic induction intensity of the transformer, which is convenient for adjusting the operating voltage provided by the transformer according to the residual magnetic induction intensity of the transformer in the power system and suppressing the inrush current. It is not necessary to adjust the internal structure of the existing transformer, nor is it necessary to connect a resistor for weakening the inrush current in parallel outside the transformer.

[0074] It should be noted that in the embodiments of the present application, taking the external magnetic field as the residual magnetic induction intensity of the transformer as an example is only used to introduce the working process of the magnetic induction detection device, and is not a specific limitation on the application scenario of the magnetic induction detection device or the detection object being the transformer. The magnetic induction intensity detection device provided in the embodiments of the present application can also be applied to other scenarios or detection objects.

[0075] This application provides another magnetic induction component, including a magnetoresistive circuit and a second processing circuit. The magnetoresistive circuit is disposed on the magnetic core of the transformer or in the air gap of the magnetic core. The magnetoresistive circuit may have a Wheatstone bridge structure. As Figure 5 shown, the magnetoresistive circuit may include a first series branch formed by series connection of a first magnetoresistor (R4) and a second magnetoresistor (R3), and a second series branch formed by series connection of a third magnetoresistor (R2) and a fourth magnetoresistor (R1).

[0076] The first end of the first series branch is connected to the first end of the second series branch, and the second end of the first series branch and the second end of the second series branch are grounded respectively. The first end of the first series branch is configured to receive the operating voltage provided by the processing circuit.

[0077] The magnetoresistors in the magnetoresistive circuit may be one or more of tunnel magnetoresistance (TMR), anisotropic magnetoresistance (AMR), and giant magnetoresistance (GMR). In some scenarios, the first magnetoresistor (R4), the second magnetoresistor (R3), the third magnetoresistor (R2), and the fourth magnetoresistor (R1) may all be TMR, or AMR, or GMR. In other scenarios, the first magnetoresistor (R4), the second magnetoresistor (R3), the third magnetoresistor (R2), and the fourth magnetoresistor (R1) may be different types of magnetoresistors among TMR, AMR, and GMR respectively.

[0078] In the embodiments of this application, the magnetoresistor may also be called a magnetosensitive resistor, which may refer to an element based on the magnetosensitive effect. For example, the resistance value of the element will change under the influence of an external magnetic field. Generally, the resistance value of the element has a linear relationship with the magnetic induction intensity of the external magnetic field, such as the residual magnetic induction intensity of the transformer. For example, the resistance value of the element where k is a constant related to the element.

[0079] In the magnetic induction component, the equivalent resistance Ry of the magnetoresistive circuit also has a linear relationship with the residual magnetic induction intensity of the transformer, When the magnetic induction component is not affected by an external magnetic field, the equivalent resistance of the magnetoresistive circuit may be denoted as Rm, and its value is equal to B0 in the foregoing linear relationship. Under the action of the residual magnetic induction intensity of the transformer on the magnetoresistive circuit, the equivalent resistance value of the magnetoresistive circuit becomes Ry. At this time, the change amount of the equivalent resistance of the magnetoresistive circuit is denoted as ΔR, where ΔR = Ry - Rm. The residual magnetic induction intensity of the transformer It can be seen that by determining the change in the equivalent resistance of the magnetoresistive circuit, the residual magnetic induction intensity of the transformer can be determined.

[0080] The second processing circuit can set the operating voltage Vcc at the first end of the first series branch. The second processing circuit can collect the voltage difference This voltage difference is the first voltage at one end (S1) where the first magnetoresistance (R4) and the second magnetoresistance (R3) are connected and the second voltage at one end (S2) where the third magnetoresistance (R2) and the fourth magnetoresistance (R1) are connected. The difference. The change ΔR in the equivalent resistance of the magnetoresistive circuit, the collected voltage difference and the relationship between the operating voltage VCC is

[0081] It can be seen that the voltage difference collected by the second processing circuit combined with the operating voltage VCC can determine the change ΔR in the equivalent resistance of the magnetoresistive circuit under the action of the residual magnetic induction intensity of the transformer in the magnetoresistive circuit. Then, combined with the residual magnetic induction intensity of the transformer and the linear relationship between the residual magnetic induction intensity of the transformer and the change in the equivalent resistance of the magnetoresistive circuit. Thus, the residual magnetic induction intensity of the transformer can be determined

[0082] Figure 6 To improve the detection accuracy or detection effect, the magnetoresistive circuit in the magnetic induction component can be arranged on the magnetic core of the transformer, or the Hall element can be arranged in the air gap of the magnetic core. In some scenarios, such as Figure 6 as shown, the magnetic induction component can be arranged on the magnetic core of the transformer or in the air gap of the magnetic core.

[0083] In a possible implementation manner, the second processing circuit can be communicatively connected to a controller (or a processor). The controller can be the controller of the power system to which the magnetic induction component belongs, or the controller of the magnetic induction intensity detection device to which the magnetic induction component belongs. The controller can pre-acquire the parameters of the magnetoresistive circuit in the magnetic induction component. The parameters of the magnetoresistive circuit can include, but are not limited to, the parameters characterizing the linear relationship between the equivalent resistance of the magnetoresistive circuit and the residual magnetic induction intensity of the transformer, such as k in the foregoing embodiments. The controller can obtain the parameters of the magnetoresistive circuit by interacting with the magnetic induction component. Alternatively, the controller can pre-store the parameters of the magnetoresistive circuit. The embodiments of the present application do not limit the manner in which the controller obtains the parameters of the magnetoresistive circuit too much.

[0084] In some examples, the second processing circuit may include a power supply module, a voltage acquisition module, and a control module. The control module may be communicatively connected to the controller and interact with the controller. The control module may control the power supply module to provide a set operating voltage Vcc to the second end of the first magnetoresistor (R4). The control module may control the voltage acquisition module to acquire the voltage difference between the second end of the first magnetoresistor and the second end of the third magnetoresistor.

[0085] The magnetic induction component provided by the embodiment of the present application provides a voltage difference, which is beneficial to determining the residual magnetic induction intensity of the transformer, so as to facilitate adjusting the operating voltage provided to the transformer according to the residual magnetic induction intensity of the transformer and suppressing the inrush current. In some scenarios, the voltage difference provided by the magnetic induction component may be referred to as a voltage parameter. To facilitate distinguishing from other magnetic induction components, the magnetic induction component provided by the embodiment of the present application may be a magnetic induction component based on the magnetosensitive effect.

[0086] Based on the magnetic induction component based on the magnetosensitive effect provided by the above embodiment, the embodiment of the present application provides another magnetic induction detection device, which can be applied to the magnetic induction intensity of an external magnetic field, such as detecting the residual magnetic induction intensity of a transformer. As Figure 7 shown, the magnetic induction detection device may include a second magnetic induction component and a second controller. The magnetoresistive circuit of the magnetic induction component may be disposed on the magnetic core of the transformer or in the air gap of the magnetic core.

[0087] The second magnetic induction component is configured to send a voltage parameter; the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, wherein the change amount ΔR of the equivalent resistance of the magnetoresistive circuit is the same as the voltage parameter and the ratio of the operating voltage VCC of the magnetoresistive circuit. It can be seen that the relationship among the change amount of the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit can be

[0088] For example, the second magnetic induction component may be any magnetic induction component based on the magnetosensitive effect provided by the above embodiment. The connection relationship of the magnetoresistive circuit in the magnetic induction component may refer to the magnetoresistive circuit in any magnetic induction component based on the magnetosensitive effect provided by the foregoing embodiment, which will not be elaborated here. The voltage parameter sent by the second magnetic induction component may be the voltage difference between the second end of the first magnetoresistor and the second end of the third magnetoresistor.

[0089] The second controller can receive the voltage parameter, and determine the change amount ΔR of the equivalent resistance of the magnetoresistive circuit in the second magnetic induction component according to the relationship between the change amount of the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit. Then, based on the set linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, the magnetic induction intensity corresponding to the change amount is determined as the remaining magnetic induction intensity of the transformer. For example, the set linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity where ΔR is the change amount of the equivalent resistance of the magnetoresistive circuit, and k is a constant related to the magnetoresistive circuit representing the magnetic induction intensity, such as the remaining magnetic induction intensity of the transformer. The second controller can use the magnetic induction intensity corresponding to the change amount of the equivalent resistance of the magnetoresistive circuit to determine the remaining magnetic induction intensity of the transformer.

[0090] In some instances, after receiving the voltage parameter, the second controller can directly determine the remaining magnetic induction intensity of the transformer based on the relationship between the change amount of the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit, as well as the linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, that is

[0091] In some possible designs, the second controller can be communicatively connected to the second magnetic induction component to interact with the parameters of the magnetoresistive circuit in the second magnetic induction component, such as the constant k in the linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity. Or the second controller can pre-store the parameters of the magnetoresistive circuit in the second magnetic induction component.

[0092] The magnetic induction intensity detection device provided by the embodiments of the present application can detect the remaining magnetic induction intensity of the transformer, which is convenient for adjusting the operating voltage provided by the transformer according to the remaining magnetic induction intensity of the transformer in the power system and suppressing the inrush current. It is not necessary to adjust the internal structure of the existing transformer, nor is it necessary to connect a resistor for weakening the inrush current in parallel outside the transformer.

[0093] It should be noted that in the embodiments of the present application, taking the magnetic field to be detected as the remaining magnetic induction intensity of the transformer as an example is only used to introduce the working process of the magnetic induction detection device, and is not a specific limitation on the application scenario of the magnetic induction detection device or the detection object being the transformer. The magnetic induction intensity detection device provided by the embodiments of the present application can also be applied to other scenarios or detection objects.

[0094] In addition, the embodiments of the present application also provide a power system. As Figure 8As shown, the power system may include a first switch, a transformer, a magnetic induction component, and a first control circuit. The first end of the first switch is coupled to a first power source, and the second end of the first switch is coupled to an electrical load through the transformer. The first power source may supply alternating current to the power system.

[0095] The first power source includes one or more of an AC power grid or a first energy conversion device. The first energy conversion device is used to convert non-electric energy into AC electric energy. For example, the first energy conversion device may be a diesel engine, such as a diesel generator. In some examples, please refer to Figure 8 again. The first power source may include an AC power grid and a first energy conversion device. In the power system provided by the embodiments of the present application, the operating frequency of the transformer may be the same as the operating frequency of the alternating current provided by the first power source. The power system may be implemented as a microgrid system.

[0096] In a possible design, in the scenario where the first power source includes an AC power grid and a first energy conversion device, the power system may further include a switching module. The switching module is capable of switching the alternating current input to the bypass module. For example, the switching module may output the alternating current provided by the AC power grid to the first switch, or output the alternating current provided by the first energy device to the bypass module. The first switch may include, but is not limited to, a power electronic switch and a mechanical switch. In some scenarios, the switching module may be implemented as an automatic transfer switch (ATS). The first switch is usually a contactor.

[0097] The power system provided by the embodiments of the present application may further include a protection device. The protection device may be used to open the circuit between the power source side and the electrical load in the case of overcurrent, overload, or short circuit on the user load side. The protection device may include, but is not limited to, a circuit breaker, a fuse, an air switch, etc. Inrush current may cause the protection device to malfunction, affecting the operation reliability and safety of the power system.

[0098] The magnetic induction component may generate a voltage parameter under the induction of the residual magnetic induction intensity of the transformer, and report the voltage parameter to the first control circuit. The voltage parameter may be used for the first control circuit to determine the residual magnetic induction intensity of the transformer based on the voltage parameter. The magnetic induction component may be disposed on the magnetic core of the transformer or in the air gap of the magnetic core.

[0099] In a possible implementation manner, the magnetic induction component may be a magnetic induction component based on the Hall effect. The Hall element in the magnetic induction component may be disposed on the magnetic core of the transformer or in the air gap of the magnetic core. The voltage parameter reported by the magnetic induction component may characterize the Hall voltage formed by the operating current in the Hall element of the magnetic induction component under the action of the residual magnetic induction intensity of the transformer.

[0100] The first control circuit can determine the magnetic induction intensity corresponding to the voltage parameter, that is, the residual magnetic induction intensity of the transformer, according to the relationship among the set voltage of the Hall element, the operating current of the Hall element, and the magnetic induction intensity. For example, the relationship among the set voltage of the Hall element, the operating current of the Hall element, and the magnetic induction intensity can be Among them, is the residual magnetic induction intensity of the transformer, is the voltage parameter received by the first control circuit, Rh is the Hall coefficient of the Hall element, d is the thickness of the Hall element, is the operating current of the Hall element. In this relationship, the coefficient of the Hall element, the thickness of the Hall element, and the operating current of the Hall element can be fixed values.

[0101] The first control circuit can pre-obtain the parameters of the Hall element such as the coefficient of the Hall element, the thickness of the Hall element, and the operating current of the Hall element. The way for the first control circuit to pre-obtain the parameters of the Hall element can include but is not limited to obtaining them by interacting with the magnetic induction component, or by pre-storing the parameters of the Hall element. The embodiments of the present application do not make too many limitations on this.

[0102] In another possible implementation, the magnetic induction component can be a magnetic induction component based on the magnetoresistive effect, and the magnetic induction component can include a magnetoresistive circuit. The magnetoresistive circuit can be arranged on the magnetic core of the transformer or in the air gap of the magnetic core.

[0103] The equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, where the change amount ΔR of the equivalent resistance of the magnetoresistive circuit is the same as the ratio of the voltage parameter to the operating voltage VCC of the magnetoresistive circuit. It can be seen that the relationship among the change amount of the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit can be

[0104] The first control circuit can receive the voltage parameter, and determine the change amount ΔR of the equivalent resistance of the magnetoresistive circuit in the second magnetic induction component according to the relationship among the change amount of the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit. Then, based on the set linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, the magnetic induction intensity corresponding to the change amount is determined as the residual magnetic induction intensity of the transformer. For example, the set linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, Among them, ΔR is the change amount of the equivalent resistance of the magnetoresistive circuit, and k is a constant related to the magnetoresistive circuit, Characterize the magnetic induction intensity, such as the residual magnetic induction intensity of a transformer. The first control circuit can determine the magnetic induction intensity corresponding to the change in the equivalent resistance of the magnetoresistive circuit as the residual magnetic induction intensity of the transformer.

[0105] In some examples, after receiving the voltage parameter, the first control circuit can directly determine the residual magnetic induction intensity of the transformer based on the relationship between the change in the equivalent resistance of the magnetoresistive circuit, the voltage parameter, and the operating voltage of the magnetoresistive circuit, as well as the linear relationship between the change in the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, that is

[0106] The first control circuit can determine at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer. Among them, the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the residual magnetic induction intensity. The first control circuit can control the first switch based on any target input voltage, so that the alternating current provided by the first power supply is input to the initial voltage of the transformer as the target input voltage.

[0107] The relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer can be determined based on the situation where the magnetic core of the transformer has been magnetized. Under the action of a periodic first alternating current, the magnetic induction intensity generated by the transformer changes with the voltage input to the transformer. Among them, the amplitude and operating frequency of the first alternating current can be the same as the amplitude and operating frequency of the alternating current provided by the first power supply. Since the voltage waveform of the alternating current provided by the first power supply is usually a sine wave, that is, the voltage and phase of the alternating current satisfy a sine function relationship. The voltage of the alternating current changes with the change of the phase angle θ. The voltage of the alternating current provided by the first power supply changes with the change of the phase angle θ, such as voltage U = Asin(ωt), where A is the amplitude, the phase angle θ = ωt, ω is a fixed value, ω = 2π×fm, and fm is the operating frequency of the alternating current provided by the first power supply.

[0108] For the convenience of distinction, for a transformer that has not been magnetized, the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer is denoted as the first relationship. For a magnetized transformer, the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer is denoted as the second relationship. Those skilled in the art know that the first relationship and the second relationship are different. And when the transformer is put into operation, inrush current is generated, usually because the transformer has residual magnetic induction intensity. The fact that the transformer has residual magnetic induction intensity already reflects that the transformer has been magnetized. In view of this, the transformer in the power system provided by the embodiments of the present application can refer to a magnetized transformer.

[0109] The first control circuit can store the relationship between the voltage of the input transformer set and the magnetic induction intensity generated by the transformer, or the first control circuit can receive the relationship between the voltage of the input transformer set and the magnetic induction intensity generated by the transformer.

[0110] In the embodiment of the present application, the magnitude of the first magnetic induction intensity is the same as that of the residual magnetic induction intensity of the transformer, and the directions are opposite. Under the action of the target input voltage corresponding to the first magnetic induction intensity, the magnetic induction intensity generated by the transformer is the first magnetic induction intensity. At this time, the total magnetic induction intensity of the transformer is the sum of the first magnetic induction intensity and the residual magnetic induction intensity. The first magnetic induction intensity and the residual magnetic induction intensity are equal in magnitude and opposite in direction. The first magnetic induction intensity can cancel out the residual magnetic induction intensity. Therefore, the total magnetic induction intensity of the transformer is zero. It can be seen that the total magnetic induction intensity of the transformer when it is put into operation is less than the saturation magnetic induction intensity of the transformer, which can avoid the situation of over-saturation of the magnetic induction intensity of the transformer, thereby avoiding the generation of inrush current.

[0111] When the transformer is applied to the power system, the physical structure of the transformer remains unchanged, so the physical structure of the magnetic circuit of the transformer remains unchanged. The voltage U of the input transformer in = Asin(ωt) and the relationship between the magnetic induction intensity B generated by the transformer can satisfy: where f is the operating frequency of the transformer, N is the number of turns of the primary winding of the transformer, S is the cross-sectional area of the magnetic core of the transformer, and t is time. Among them, the operating frequency, the number of turns, and the cross-sectional area of the magnetic core of the transformer are fixed values. The direction of is related to the positive and negative signs of Asin(ωt). For example, when Asin(ωt) is positive, the direction of is the first direction. When Asin(ωt) is negative, the direction of is opposite to the first direction.

[0112] In one example, the voltage of the input transformer is a periodic alternating current, and this alternating current can be the alternating current provided by the first power supply. Taking one cycle as an example, as Figure 9 shown, within this cycle, the variation of the voltage amplitude of the alternating current of the input transformer with time can be seen in the fine solid line curve. Under the action of this alternating current, the variation of the magnetic induction intensity generated by the transformer with time can be seen in the thick solid line curve.

[0113] Figure 9The thin dashed line therein shows the first magnetic induction intensity. During one period, there is at least one time when the magnetic induction intensity of the transformer at this time is the first magnetic induction intensity, that is, the same magnitude as the remaining magnetic induction intensity of the transformer and the opposite direction. Assume that the magnetic induction intensity of the transformer at time ta during this period is the first magnetic induction intensity, and the magnetic induction intensity at time tb is also the first magnetic induction intensity.

[0114] The first control circuit can determine the voltage of the alternating current corresponding to time ta as the target input voltage, or determine the voltage of the alternating current corresponding to time tb as the target input voltage. When the voltage is input into the transformer, the magnetic induction intensity generated by the transformer under the action of the voltage is B(ta), that is, the first magnetic induction intensity. When the voltage is input into the transformer, the magnetic induction intensity generated by the transformer under the action of the voltage is B(tb), that is, the first magnetic induction intensity.

[0115] The first control circuit can make the first switch in the on state at time ta or time tb by determining time ta or time tb as the closing moment of the first switch, so that the initial voltage of the alternating current provided by the first power supply output to the transformer can be or that is, the aforementioned target input voltage. Under the action of the target input voltage, the magnetic induction intensity generated by the transformer is the first magnetic induction intensity. At this time, the total magnetic induction intensity of the transformer is the sum of the first magnetic induction intensity and the remaining magnetic induction intensity, that is, zero.

[0116] In the embodiment of the present application, when the first control circuit controls the first switch, the phase of the alternating current provided by the first power supply when the first switch switches from the open state to the on state can be recorded as the closing initial phase angle θm of the first switch. The phase angle of the alternating current at the closing moment is ωta or ωtb, that is, the closing initial phase angle of the first switch can be ωta or ωtb. The first control circuit controls the first switch to be in the on state at the closing moment, so that the initial voltage of the alternating current input to the transformer can be any one of at least one target input voltage. At this time, the sum of the magnetic induction intensity generated by the transformer under the action of the alternating current and the remaining magnetic induction intensity is zero.

[0117] Since the magnetizing inrush current can cause the core of the transformer to heat up, affecting the service life of the transformer. Moreover, the magnetizing inrush current contains a large amount of high-order harmonics, affecting the power quality of the power system. In the power system provided by the embodiments of the present application, the magnetic induction component can, based on the Hall effect, detect the voltage parameter of the Hall voltage generated by the Hall element of itself due to the residual magnetic induction intensity of the transformer. The magnetic induction component can also, based on the magnetosensitive effect, detect the voltage parameter that can reflect the change amount of its own equivalent resistance. The magnetic induction component reporting the voltage parameter to the control circuit helps the first control circuit determine the residual magnetic induction intensity of the transformer. The first control circuit can determine the residual magnetic induction intensity of the transformer and, based on the determined residual magnetic induction intensity, control the first switch so that the alternating current input to the transformer is the aforementioned target input voltage. When the transformer is put into operation, the magnetic induction intensity generated under the action of the target input voltage is the same in magnitude as the residual magnetic induction intensity of the transformer and opposite in direction, so that the total magnetic induction intensity of the transformer is zero, avoiding the situation where the magnetic induction intensity of the transformer is greater than the saturation magnetic induction intensity, thereby realizing the suppression of the generation of magnetizing inrush current.

[0118] The embodiments of the present application also provide a power system, as Figure 10 shown. The power system may include a transformer, an inverter circuit, a magnetic induction component, and a second control circuit. One end of the transformer is coupled to the inverter circuit, and the other end is coupled to an electrical load. The transformer can convert the alternating current provided to the inverter and then provide it to the electrical load. The inverter circuit can output alternating current under the control of the second control circuit.

[0119] In the embodiments of the present application, the inverter circuit may include, but is not limited to, a direct current to alternating current circuit. The inverter circuit may also include an alternating current to direct current circuit, enabling the inverter circuit to have the function or ability of bidirectional inversion. In some possible application scenarios, the inverter circuit may be implemented as a power control system (PCS).

[0120] In some possible scenarios, the power system may further include a second power source. The input side of the inverter circuit is coupled to the second power source, and the output side of the inverter circuit is coupled to the transformer; the second power source can provide direct current. The inverter circuit can convert the direct current provided by the second power source into alternating current under the control of the second control circuit. In some examples, the second power source includes one or more of a second energy conversion device and an energy storage device. The second energy conversion device can convert non-electric energy into direct current electric energy. For example, the second energy conversion device can be a photovoltaic power generation device. The energy storage device can store electric energy and output direct current electric energy.

[0121] The magnetic induction component can generate a voltage parameter under the induction of the residual magnetic induction intensity of the transformer and send the voltage parameter to the second control circuit. When the magnetic induction component includes a Hall element, the voltage parameter represents the voltage formed by the working current in the Hall element under the action of the residual magnetic induction intensity of the transformer; or, when the magnetic induction component includes a magnetoresistive circuit, the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, where the ratio of the working voltage of the magnetoresistive circuit to the voltage parameter represents the change amount of the equivalent resistance of the magnetoresistive circuit.

[0122] The second control circuit can determine the residual magnetic induction intensity of the transformer based on the voltage parameter. The process or method for the second control circuit to determine the residual magnetic induction intensity of the transformer can refer to the relevant introduction in the foregoing embodiments for determining the residual magnetic induction intensity of the transformer, which will not be elaborated here.

[0123] The second control circuit can determine the target output voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, where the second magnetic induction intensity corresponding to the target output voltage is the maximum magnetic induction intensity of the transformer The difference from the residual magnetic induction intensity. For example, if the residual magnetic induction intensity is +Br, then the second magnetic induction intensity is the difference between the maximum magnetic induction intensity +Bm in the same direction as the residual magnetic induction intensity and the residual magnetic induction intensity +Br, that is, +(Bm - Br). Another example, if the residual magnetic induction intensity is -Br, then the second magnetic induction intensity is the difference between the maximum magnetic induction intensity -Bm in the same direction as the residual magnetic induction intensity and the residual magnetic induction intensity -Br, that is, -(Bm - Br).

[0124] The maximum magnetic induction intensity of the transformer can be preset. And the maximum magnetic induction intensity is less than the saturation magnetic induction intensity of the transformer. The maximum magnetic induction intensity of the transformer can represent the maximum magnetic induction intensity when the transformer is working.

[0125] In the embodiments of the present application, the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer can refer to the introduction in the foregoing embodiments, which will not be elaborated here. The second control circuit can store the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, or can obtain the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer in advance.

[0126] When the transformer is put into operation, that is, when the inverter circuit supplies voltage to the transformer, the second control circuit can control the initial voltage of the alternating current output by the inverter circuit to be the target output voltage. The magnetic induction intensity generated by the transformer under the action of the target output voltage is the second magnetic induction intensity. The second magnetic induction intensity is the difference between the maximum magnetic induction intensity and the residual magnetic induction intensity of the transformer. Then, the sum of the second magnetic induction intensity and the residual magnetic induction intensity is the maximum magnetic induction intensity of the transformer. It can be seen that when the transformer is put into operation, the total magnetic induction intensity of the transformer is the maximum magnetic induction intensity. Since the total magnetic induction intensity does not exceed the saturation magnetic induction intensity, the magnetic induction intensity of the transformer is not saturated. Thus, the generation of inrush current is avoided. The safety and reliability of the power system operation can be improved, and the protection device in the power system triggered by inrush current can be avoided. And the service life of the transformer can be extended.

[0127] The aforementioned second magnetic induction intensity can also be referred to as the excitation space ΔB of the transformer. The excitation space of the transformer can be understood as the maximum value of the magnetic induction intensity that can be generated when the transformer is put into operation. If the sum of the maximum magnetic induction intensity generated when the transformer is put into operation and the residual magnetic induction intensity reaches the saturation magnetic induction intensity of the transformer, the phenomenon of transformer magnetic saturation will occur. In the embodiment of the present application, the sum of the excitation space and the residual magnetic induction intensity of the transformer is the set maximum magnetic induction intensity during the operation of the transformer, which is less than the saturation magnetic induction intensity. Therefore, when the second control circuit controls the inverter circuit to input voltage to the transformer so that the magnetic induction intensity generated by the transformer is the excitation space, the total magnetic induction intensity of the transformer will not reach the saturation magnetic induction intensity.

[0128] The second control circuit can pre-acquire or store the voltage U input to the transformer in and the magnetic induction intensity generated by the transformer between the relationships, such as where f is the operating frequency of the transformer, N is the number of turns of the transformer, and S is the cross-sectional area of the magnetic core of the transformer. Among them, the operating frequency, the number of turns, and the cross-sectional area of the magnetic core are all fixed values.

[0129] The second control circuit can determine the voltage corresponding to the excitation space, denoted as the target output voltage U, based on the relationship between the input voltage of the transformer and the magnetic induction intensity generated by the transformer described above out , where U out = 4.44×f×N×S×ΔB. The second control circuit can control the inverter circuit based on the target output voltage U out , so that the initial voltage of the alternating current output by the inverter circuit is the target output voltage U out, it should be understood that the amplitude of the initial voltage is the same as that of the target output voltage, and the phase of the initial voltage is the same as that of the target output voltage. In this way, when the transformer is put into operation, the initial voltage of the alternating current output by the inverter circuit is the target output voltage U out , the magnetic induction intensity generated by the transformer can be ΔB. At this time, the total of the magnetic induction intensity generated by the transformer and the residual magnetic induction intensity of the transformer does not exceed the maximum magnetic induction intensity of the transformer, that is, the transformer does not exhibit magnetic saturation, thereby suppressing the inrush current in the power system.

[0130] In some possible cases, the voltage waveform of the alternating current provided by the inverter circuit is usually a sine wave, that is, the relationship between the voltage and the phase of the alternating current satisfies the sine function relationship. The voltage of the alternating current changes with the change of the phase angle θ. For example, the voltage U = Asin(ωt), where the phase angle θ = ωt, ω is a fixed value, and ω = 2π×fm, and fm is the operating frequency of the alternating current provided by the inverter circuit.

[0131] The second control circuit can control the initial voltage of the alternating current output by the inverter circuit to be the target output voltage U out . At this time, the number of the initial phase angles θx of the alternating current output by the inverter circuit can be at least one. The relationship between any initial phase angle and the target output voltage satisfies U out = Asin(θx). The second control circuit can control the inverter circuit based on the amplitude A of the alternating current and any one initial phase angle θx, so that the initial value of the alternating current output by the inverter circuit is the target output voltage U out .

[0132] The embodiment of the present application also provides a power system, as Figure 11 shown, the power system may include a first power supply branch, a second power supply branch, a first switch, a second switch, a transformer, a magnetic induction component, and a third control circuit.

[0133] The first power supply branch is coupled to a first power supply, and the first power supply branch is coupled to a user load through the first switch. The first power supply can provide a first alternating current to the first power supply branch. The first power supply branch can transmit the first alternating current to the first switch. For the convenience of distinction, the alternating current provided by the first power supply branch to the user load is denoted as the first alternating current, and the alternating current provided by the second power supply direct current to the user load is denoted as the second alternating current.

[0134] The second power supply branch is coupled to the second power source. The second power supply branch is coupled to one end of the transformer through the second switch. The other end of the transformer is coupled to the user load. The second power source can supply the first direct current to the second power supply. The second power supply branch is configured to convert the first direct current into the second alternating current and then transmit it to the second switch.

[0135] The magnetic induction component is disposed on the magnetic core of the transformer or in the air gap of the magnetic core, and is configured to report voltage parameters to the third control circuit, where the voltage parameters are used by the third control circuit to determine the remaining magnetic induction intensity of the transformer. In the embodiments of the present application, for the third control circuit to determine the remaining magnetic induction intensity of the transformer, reference may be made to the description in the foregoing embodiments, which will not be elaborated herein.

[0136] In a possible scenario, in the scenario where the first power source supplies power and the first power supply branch supplies alternating current to the user load, the third control circuit may determine at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, where the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the remaining magnetic induction intensity. Control the first switch to make the initial voltage of the alternating current input to the transformer be any one of the at least one target input voltages.

[0137] In the embodiments of the present application, for the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, reference may be made to the description in the foregoing embodiments, which will not be elaborated herein. The third control circuit may store the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, or may obtain in advance the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer.

[0138] Since the alternating current input to the transformer is the target input voltage, when the transformer is put into operation, under the action of the target input voltage, the magnetic induction intensity generated by the transformer is the first magnetic induction intensity. At this time, the total magnetic induction intensity of the transformer is the sum of the first magnetic induction intensity and the remaining magnetic induction intensity, that is, zero. Since the total magnetic induction intensity of the transformer is zero and does not exceed the maximum magnetic induction intensity of the transformer, no inrush current can be generated. The safety and reliability of the power system are improved, and the harmonics in the inrush current are also prevented from entering the first power source side, the power quality is improved, and the operation stability of the power system can also be improved.

[0139] In another possible scenario, in the case where the second power supply powers and the second power supply branch provides alternating current to the user load, the third control circuit may determine the target output voltage of the second power supply branch based on the relationship between the set voltage input to the transformer and the magnetic induction intensity generated by the transformer, where the second magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the remaining magnetic induction intensity. The third control circuit controls the second power supply branch such that the initial voltage of the alternating current output by the second power supply branch is the target output voltage.

[0140] The third control circuit may control the second switch to be in the conducting state before the second power supply branch outputs alternating current. It may also control the second switch to be in the conducting state after the second power supply branch outputs alternating current.

[0141] Since the initial voltage of the alternating current output by the second power supply branch is the target output voltage, when the transformer is put into operation, under the action of the target output voltage, the magnetic induction intensity generated by the transformer is the second magnetic induction intensity. At this time, the total magnetic induction intensity of the transformer is the sum of the second magnetic induction intensity and the remaining magnetic induction intensity, that is, the maximum magnetic induction intensity. It can be seen that the total magnetic induction intensity does not exceed the maximum magnetic induction intensity when the transformer is put into operation, so that inrush current cannot be generated. This improves the safety and reliability of the power system, and also avoids the harmonics in the inrush current from entering the first power supply side, improves the power quality, and can also improve the operating stability of the power system.

[0142] In the embodiments of the present application, the first switch may include one or more of a power electronic switch and a mechanical switch. The third control circuit may control the power electronic switch and the mechanical switch. In the scenario where the first power supply includes an AC power grid, based on the safety specification requirements for fault disconnection on the grid side, the first switch generally may include a power electronic switch and a mechanical switch. In this case, the closing initial phase angles of the power electronic switch and the mechanical switch may be the same. Or the power electronic switch may be in the conducting state prior to the mechanical switch, and then the closing initial phase angle of the mechanical switch may be the closing initial phase angle determined by the third control circuit. Or, the mechanical switch may be in the conducting state prior to the power electronic switch, and then the closing initial phase angle of the power electronic switch may be the closing initial phase angle determined by the third control circuit.

[0143] Please refer to Figure 11 , the power system may further include the first power supply. The first power supply may include an AC power grid and a first energy conversion device. The first power supply branch may include a transmission line, which can transmit the alternating current provided by the first power supply to the first switch. In the power system provided by the embodiments of the present application, the operating frequency of the transformer may be the same as the operating frequency of the alternating current provided by the first power supply. The power system may be implemented as a microgrid system.

[0144] In a possible design, in the scenario where the first power supply includes an AC power grid and a first energy conversion device, the first power supply branch may further include a switching module, which is capable of switching the alternating current input to the first switch. For example, the switching module can output the alternating current provided by the AC power grid to the first switch, or output the alternating current provided by the first energy device to the first switch. In some scenarios, the switching module can be implemented as an ATS.

[0145] In a possible design, the second power supply includes one or more of a second energy conversion device and an energy storage device. The second energy conversion device can convert non-electric energy into direct current electric energy. For example, the second energy conversion device can be a photovoltaic power generation device. The energy storage device can store electric energy and output direct current electric energy.

[0146] In a possible design, the magnetic induction component in the power system provided by the embodiments of the present application can be any one of the magnetic induction components in the foregoing embodiments, and can send voltage parameters to the control circuit. For example, the magnetic induction component is communicatively connected to the control circuit. In the embodiments of the present application, the communicative connection may include, but is not limited to, a wireless communicative connection and a wired communicative connection. The wireless communication can be a communication method implemented based on any wireless communication technology. The wired communication includes, but is not limited to, bus communication.

[0147] As Figure 12 shown, the magnetic induction component can send voltage parameters for determining the remaining magnetic induction intensity of the transformer to the third control circuit, facilitating the control circuit to determine the remaining magnetic induction intensity of the transformer based on the voltage parameters. The third control circuit can determine that the power supply branch for supplying power to the electrical load is the first power supply branch or the second power supply branch based on the set power supply method. For example, the set power supply method can be the first power supply method, and the first power supply method can indicate that the first power supply branch supplies power to the user load. Again, for example, the set power supply method can be the second power supply method, and the second power supply method can indicate that the second power supply branch supplies power to the user load.

[0148] The third control circuit can control the first switch to be in the conducting state based on the first power supply method, so that the first power supply branch supplies power to the user load. Among them, in the operation of controlling the first switch by the third control circuit, the third control circuit determines at least one target input voltage based on the relationship between the voltage input to the transformer set and the magnetic induction intensity generated by the transformer, where the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the remaining magnetic induction intensity. The third control circuit can determine the phase angle of any one of the at least one target input voltage as the closing initial phase angle of the first switch, and then control the first switch to be in the conducting state based on this closing initial phase angle, so that the initial voltage of the first alternating current input to the transformer is this any one target input voltage.

[0149] The third control circuit can control the inverter circuit and the second switch based on the second power supply mode, so that the second power supply branch supplies power to the user load. Among them, in the operation of controlling the inverter circuit and the second switch, the third control circuit can determine the target output voltage of the inverter circuit based on the relationship between the set voltage input to the transformer and the magnetic induction intensity generated by the transformer. Among them, the second magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the remaining magnetic induction intensity. This second magnetic induction intensity can also be called the excitation space. The third control circuit can control the inverter circuit based on the target output voltage, so that the initial voltage of the second alternating current output by the inverter circuit is the target output voltage. The amplitude of this initial voltage is the same as the amplitude of the target output voltage, and the phase of this initial voltage is the same as the phase of the target output voltage.

[0150] The third control circuit can control the second switch to be in the on state before controlling the inverter circuit to output the second alternating current. Or, the third control circuit can control the second switch to be in the on state after controlling the inverter circuit to output the second alternating current. Then the third control circuit can control the amplitude range of the second alternating current output by the inverter circuit to gradually increase.

[0151] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.

Claims

1. A power system, characterized in that, The power system includes a first switch, a transformer, a magnetic induction component, and a control circuit; a first end of the first switch is coupled to a first power supply, and a second end of the first switch is coupled to an electrical load through the transformer; the first power supply can provide alternating current to the power system, the magnetic induction component includes a component based on the Hall effect or an element based on the magnetosensitive effect, and the component based on the Hall effect or the element based on the magnetosensitive effect is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; The magnetic induction component is configured to generate a voltage parameter under the induction of the residual magnetic induction intensity of the transformer, and send the voltage parameter to the control circuit, and the voltage parameter is used for the control circuit to determine the residual magnetic induction intensity of the transformer; The control circuit is configured to: Determine at least one target input voltage based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, wherein a first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the residual magnetic induction intensity; Control the first switch so that an initial voltage of the alternating current input to the transformer is any one of the at least one target input voltage.

2. The system according to claim 1, wherein When the magnetic induction component includes a Hall element, the voltage parameter characterizes a voltage formed by the working current in the Hall element under the action of the residual magnetic induction intensity of the transformer; or When the magnetic induction component includes a magnetoresistive circuit, an equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, and a ratio of the working voltage of the magnetoresistive circuit to the voltage parameter characterizes a change amount of the equivalent resistance of the magnetoresistive circuit.

3. The system according to claim 2, wherein The magnetic induction component includes a Hall element; the control circuit is further configured to: Determine the magnetic induction intensity corresponding to the voltage parameter as the residual magnetic induction intensity of the transformer based on the relationship between the voltage, the working current, and the magnetic induction intensity of the Hall element.

4. The system according to claim 2, wherein The magnetic induction component includes a magnetoresistive circuit; the control circuit is further configured to: Determine the magnetic induction intensity corresponding to the target change amount as the residual magnetic induction intensity of the transformer based on the relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity, wherein the target change amount is a ratio of the voltage parameter to the working voltage of the magnetoresistive circuit.

5. The system according to any one of claims 1-4, characterized in that, The control circuit is further configured to: Determine a closing moment of the first switch after determining the at least one target input voltage and before controlling the first switch, wherein the initial voltage of the alternating current is the same as any one of the target input voltages at the closing moment; When the control circuit controls the first switch, it is specifically configured to: Control the first switch to be in a conducting state at the closing moment.

6. A power system, characterized in that, It includes a transformer, an inverter circuit, a magnetic induction component, and a control circuit; one end of the transformer is coupled to the inverter circuit, and the other end is coupled to an electrical load. The magnetic induction component includes a component based on the Hall effect or an element based on the magnetosensitive effect. The component based on the Hall effect or the element based on the magnetosensitive effect is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; The inverter circuit is configured to output alternating current under the control of the control circuit; The transformer is configured to convert the power of the alternating current provided to the inverter circuit and then supply it to the electrical load; The magnetic induction component is configured to generate a voltage parameter under the induction of the residual magnetic induction intensity of the transformer and send the voltage parameter to the control circuit. The voltage parameter is used for the control circuit to determine the residual magnetic induction intensity of the transformer; The control circuit is configured to: Based on the relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer set, determine the target output voltage, where the first magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the residual magnetic induction intensity, and the maximum magnetic induction intensity of the transformer is less than the saturation magnetic induction intensity of the transformer; Control the inverter circuit to make the initial voltage of the alternating current output by the inverter circuit be the target output voltage.

7. The system according to claim 6, wherein When the magnetic induction component includes a Hall element, the voltage parameter represents the voltage formed by the working current in the Hall element under the action of the residual magnetic induction intensity of the transformer; or, When the magnetic induction component includes a magnetoresistive circuit, the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer. The ratio of the working voltage of the magnetoresistive circuit to the voltage parameter represents the change amount of the equivalent resistance of the magnetoresistive circuit.

8. The system according to claim 7, wherein The magnetic induction component includes a Hall element; the control circuit is further configured to: Based on the relationship between the voltage, the working current, and the magnetic induction intensity of the Hall element set, determine the magnetic induction intensity corresponding to the voltage parameter as the residual magnetic induction intensity of the transformer.

9. The system according to claim 7, wherein The magnetic induction component includes a magnetoresistive circuit; the control circuit is further configured to: Based on the relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity set, determine the magnetic induction intensity corresponding to the target change amount as the residual magnetic induction intensity of the transformer, where the target change amount is the ratio of the voltage parameter to the working voltage of the magnetoresistive circuit.

10. A power system, characterized in that, It includes: A first power supply branch, a second power supply branch, a first switch, a second switch, a transformer, a magnetic induction component, and a control circuit. The magnetic induction component includes a component based on the Hall effect or an element based on the magnetosensitive effect. The component based on the Hall effect or the element based on the magnetosensitive effect is disposed on the magnetic core of the transformer or in the air gap of the magnetic core; The first power supply branch is coupled to a first power source. The first power supply branch is coupled to a user load through the first switch; the first power source can supply a first alternating current to the first power supply branch; The first power supply branch is used to transmit the first alternating current to the first switch; The second power supply branch is coupled to a second power source; The second power supply branch is coupled to one end of the transformer through the second switch; the other end of the transformer is coupled to the user load; the second power source can supply a first direct current to the second power supply branch; The second power supply branch is used to convert the first direct current into a second alternating current and then transmit it to the second switch; The magnetic induction component is used to generate a voltage parameter under the induction of the remaining magnetic induction intensity of the transformer, and send the voltage parameter to the control circuit, and the voltage parameter is used for the control circuit to determine the remaining magnetic induction intensity of the transformer; The control circuit is used for: Based on the set relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, determine at least one target input voltage, wherein the first magnetic induction intensity corresponding to the target input voltage is the same in magnitude and opposite in direction to the remaining magnetic induction intensity; control the first switch so that the initial voltage of the first alternating current input to the transformer is any one of the at least one target input voltage; or, Based on the set relationship between the voltage input to the transformer and the magnetic induction intensity generated by the transformer, determine the target output voltage of the second power supply branch, wherein the second magnetic induction intensity corresponding to the target output voltage is the difference between the maximum magnetic induction intensity of the transformer and the remaining magnetic induction intensity, and the maximum magnetic induction intensity of the transformer is less than the saturation magnetic induction intensity of the transformer; control the second power supply branch so that the initial voltage of the second alternating current output by the second power supply branch is the target output voltage.

11. The system according to claim 10, wherein, The first power source includes one or more of an AC power grid or a first energy conversion device; the first energy conversion device is used to convert non-electric energy into AC electric energy.

12. The system according to claim 10 or 11, wherein When the first power source includes the AC power grid and the first energy conversion device, the first power supply branch further includes a switching module; The switching module is respectively coupled to the AC power grid, the first energy conversion device, and the first switch, and the switching module is used to output the first alternating current provided by the AC power grid or the first alternating current provided by the first energy conversion device to the first switch.

13. The system according to claim 10 or 11, characterized in that, The second power supply branch includes an inverter circuit; The inverter circuit is used to convert the direct current provided by the second power source into the second alternating current.

14. The system according to claim 13, wherein The second power source includes one or more of a second energy conversion device and an energy storage device; The second energy conversion device is used to convert non-electric energy into direct current and then supply it to the inverter circuit; The energy storage device is used to supply direct current to the inverter circuit.

15. A magnetic induction component, characterized in that, It includes a Hall element and a processing circuit; wherein, the Hall element is arranged on the magnetic core of the transformer or in the air gap of the magnetic core; The processing circuit is used for: A set working current is provided to the Hall element; wherein, the current direction of the working current is perpendicular to the direction of the magnetic induction intensity when the transformer operates, and under the action of the residual magnetic induction intensity of the transformer, a first voltage is formed at the Hall element; the first ratio of the first voltage to the working current has a linear relationship with the residual magnetic induction intensity; The first voltage is sent to a controller communicatively connected to the processing circuit, wherein the first voltage is used by the controller to determine the residual magnetic induction intensity of the transformer.

16. The component according to claim 15, wherein The ratio of the first ratio to the residual magnetic induction intensity is the same as the second ratio of the Hall coefficient of the Hall element to the thickness of the Hall element.

17. A magnetic induction component, characterized in that, Comprising: A magnetoresistive circuit and a processing circuit, the magnetoresistive circuit is arranged on the magnetic core of the transformer or in the air gap of the magnetic core; the magnetoresistive circuit includes a first series branch composed of a first magnetoresistor and a second magnetoresistor connected in series and a second series branch composed of a third magnetoresistor and a fourth magnetoresistor connected in series; The first end of the first series branch is connected to the first end of the second series branch, and the second end of the first series branch and the second end of the second series branch are respectively grounded; the first end of the first series branch is configured to receive the working voltage provided by the processing circuit; The processing circuit is configured to: Provide a set working voltage to the magnetoresistive circuit; Collect a voltage difference, the voltage difference being the difference between a first voltage at one end where the first magnetoresistor and the second magnetoresistor are connected and a second voltage at one end where the third magnetoresistor and the fourth magnetoresistor are connected; wherein, the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, and the change amount of the equivalent resistance of the magnetoresistive circuit is the same as the ratio of the voltage difference to the working voltage; the change amount has a linear relationship with the residual magnetic induction intensity; Send the voltage difference to a controller communicatively connected to the processing circuit, and the voltage difference is used by the controller to determine the residual magnetic induction intensity of the transformer.

18. The component according to claim 17, wherein, The magnetoresistive circuit includes one or more of a tunneling magnetoresistance sensor magnetoresistance TMR, an anisotropic magnetoresistance AMR, and a giant magnetoresistance GMR.

19. A magnetic induction intensity detection device, characterized in that, Comprising a magnetic induction component and a controller; the Hall element of the magnetic induction component is arranged on the magnetic core of the transformer or in the air gap of the magnetic core; The magnetic induction component is configured to send a first voltage, and the first voltage represents the voltage formed by the working current in the Hall element under the action of the residual magnetic induction intensity of the transformer; The controller is configured to: Receive the first voltage; Based on the relationship between the voltage, the working current, and the magnetic induction intensity of the set Hall element, determine the magnetic induction intensity corresponding to the first voltage as the residual magnetic induction intensity of the transformer.

20. The magnetic induction intensity detection device according to claim 19, characterized in that, The magnetic induction component is the magnetic induction component as described in claim 15 or 16.

21. A magnetic induction intensity detection device, characterized in that, Comprising a magnetic induction component and a controller; the magnetoresistive circuit of the magnetic induction component is arranged on the magnetic core of the transformer or in the air gap of the magnetic core; The magnetic induction component is used to send voltage parameters; the equivalent resistance of the magnetoresistive circuit changes under the action of the residual magnetic induction intensity of the transformer, wherein the change amount of the equivalent resistance of the magnetoresistive circuit is the same as the ratio of the voltage parameter to the working voltage of the magnetoresistive circuit; The controller is configured to: Receive the voltage parameter; Based on the linear relationship between the change amount of the equivalent resistance of the magnetoresistive circuit and the magnetic induction intensity set, determine the magnetic induction intensity corresponding to the change amount as the residual magnetic induction intensity of the transformer.

22. The device according to claim 21, characterized in that, The magnetic induction component is the magnetic induction component according to any one of claims 17 or 18.

23. A transformer, characterized in that, It includes a magnetic core, a primary winding, a secondary winding, and a magnetic induction intensity detection device according to any one of claims 19-22; The primary winding and the secondary winding are respectively wound around the magnetic core to achieve power conversion; Part or all of the magnetic induction intensity detection device is arranged on the magnetic core or in the air gap of the magnetic core, and is used to detect the magnetic induction intensity of the magnetic core.

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