Field current supply circuit and electronic device

Abstract

This application provides an excitation current supply circuit and electronic device, relating to the field of electronic circuit technology. The excitation current supply circuit includes: an excitation control circuit, an excitation coil, a generator controller, and a power module. A first input terminal of the excitation control circuit is connected to the output terminal of the power module for receiving the power supply voltage output by the power module. A first output terminal of the excitation control circuit is connected to the input terminal of the generator controller for outputting the charging status of the power module to the generator controller. A second input terminal of the excitation control circuit is connected to the output terminal of the generator controller for receiving the current control signal output by the generator controller. A second output terminal of the excitation control circuit is connected to the first terminal of the excitation coil for outputting excitation current to the excitation coil. This application can improve the stability of the excitation current.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to an excitation current supply circuit and an electronic device. Background Technology

[0002] Excitation current is the current generated by electrical equipment such as generators when providing the working magnetic field. During normal operation, the excitation current is generated by the DC voltage applied to the rotor externally, usually supplied by rectified silicon controlled rectifier. When a generator is running alone, the excitation regulator adjusts the generator's terminal voltage by adjusting the generator's excitation current. When multiple generators are running in parallel in a power system, the excitation regulator adjusts the excitation current to rationally distribute the reactive power among the parallel generator sets, thereby improving the static and dynamic stability of the power system.

[0003] Current excitation current generation circuits primarily control MOS switching devices via excitation coil control signals output from the vehicle controller. These MOS switching devices then directly control the battery to supply power to the generator's excitation coil. This method suffers from fluctuations in excitation current due to load changes, causing oscillations in the generator's main winding output voltage and drift in the rectified voltage. In severe cases, this can burn out other equipment connected to the battery's charging / discharging main line. Furthermore, existing excitation current generation circuits cannot control the excitation coil based on the battery's charging state. If the excitation coil is powered by the battery while the generator is charging it, the battery will be depleted, impacting its lifespan. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an excitation current supply circuit and electronic device, which can specifically solve the problem of unstable excitation current in existing excitation current generation circuits.

[0005] Based on the above objectives, in a first aspect, this application proposes an excitation current supply circuit, comprising: an excitation control circuit, an excitation coil, a generator controller, and a power supply module; a first input terminal of the excitation control circuit is connected to the output terminal of the power supply module for receiving the power supply voltage output by the power supply module; a first output terminal of the excitation control circuit is connected to the input terminal of the generator controller for outputting the charging status of the power supply module to the generator controller; a second input terminal of the excitation control circuit is connected to the output terminal of the generator controller for receiving the current control signal output by the generator controller; and a second output terminal of the excitation control circuit is connected to the first terminal of the excitation coil for outputting excitation current to the excitation coil.

[0006] Optionally, the excitation control circuit includes: a constant current source module, a negative feedback control module, and a charging status detection module; the input terminal of the constant current source module is used to receive the current control signal, and the output terminal of the constant current source module is connected to the input terminal of the negative feedback control module to provide a constant current to the negative feedback control module; the output terminal of the negative feedback control module is used to output excitation current to the excitation coil, and the input terminal of the charging status detection module is connected to the output terminal of the negative feedback control module; the output terminal of the charging status detection module is used to output the charging status of the power supply module.

[0007] Optionally, the constant current source module includes: an amplifier, a first resistor, a second resistor, a third resistor, and a first switching transistor; the positive input terminal of the amplifier is the input terminal of the constant current source module, the inverting output terminal of the amplifier is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the first terminal of the third resistor and the emitter of the first switching transistor, and the second terminal of the third resistor is grounded; the output terminal of the amplifier is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the base of the first switching transistor, the collector of the first switching transistor is the output terminal of the constant current source module, and the collector of the first switching transistor is connected to the input terminal of the negative feedback control module through a fourth resistor.

[0008] Optionally, a fifth resistor is also connected between the inverting input terminal of the amplifier and the power supply module.

[0009] Optionally, the negative feedback control module includes: a second switch, a third switch, a fourth switch, a sixth resistor, and a seventh resistor; the base of the second switch is the input terminal of the negative feedback control module, the emitter of the second switch is connected to the first terminal of the sixth resistor, and the second terminal of the sixth resistor is connected to the power supply module; the base of the third switch is connected to the base and collector of the second switch; the first terminal of the seventh resistor is connected to the second terminal of the sixth resistor, and the second terminal of the seventh resistor is connected to the emitter of the third switch and the collector of the fourth switch; the base of the fourth switch is connected to the collector of the third switch, the emitter of the fourth switch is the output terminal of the negative feedback control module, and the emitter of the fourth switch is connected to the excitation coil through a diode.

[0010] Optionally, the charging status detection module includes an eighth resistor and a ninth resistor; the first end of the eighth resistor is connected to the emitter of the fourth switching transistor, the second end of the eighth resistor is connected to the first end of the ninth resistor, the second end of the ninth resistor is grounded, and the second end of the eighth resistor is the output terminal of the electric vehicle charging status detection module.

[0011] Optionally, the fourth switch and the first switch are of the same type, and the second switch and the third switch are of the same type.

[0012] Optionally, an anti-reverse current diode is provided between the emitter of the fourth switching transistor and the excitation coil, and a freewheeling diode is connected in parallel across the two ends of the excitation coil.

[0013] Optionally, the excitation current supply circuit further includes a generator main winding and a load circuit, both of which are connected to the output terminal of the power module.

[0014] In a second aspect, an electronic device is also provided, the electronic device comprising the excitation current supply circuit described in any one of the first aspects.

[0015] In summary, this application has at least the following beneficial effects:

[0016] This application provides an excitation current supply circuit, including an excitation control circuit. The first input terminal of the excitation control circuit is connected to the output terminal of a power module, used to receive the power supply voltage output by the power module, which provides the operating voltage for the excitation control circuit. The first output terminal of the excitation control circuit is connected to the input terminal of a generator controller, used to output the charging status of the power module to the generator controller, enabling detection of the charging status of the power module and timely detection of charging faults. The second input terminal of the excitation control circuit is connected to the output terminal of the generator controller, used to receive the current control signal output by the generator controller, and uses the current control signal to achieve constant and controllable excitation current. The second output terminal of the excitation control circuit is connected to the first terminal of the excitation coil, used to output excitation current to the excitation coil, so that the current flowing through the excitation coil is a stable value, thereby improving the stability of the excitation current. Attached Figure Description

[0017] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0018] Figure 1 A circuit diagram of an excitation current supply circuit according to this application is shown.

[0019] Figure 2 A circuit diagram of an excitation control circuit according to an embodiment of this application is shown;

[0020] Figure 3 Another circuit diagram of an excitation current supply circuit according to this application is shown;

[0021] Figure 4 A schematic diagram of the structure of an electronic device according to an embodiment of this application is shown. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This diagram illustrates the circuit structure of an excitation current supply circuit provided in this application. In an embodiment of this application, the excitation current supply circuit includes: an excitation control circuit 101, an excitation coil 102, a generator controller 103, and a power module 104. The first input terminal of the excitation control circuit 101 is connected to the output terminal of the power module 104, and is used to receive the power supply voltage output by the power module 104. This power supply voltage provides the operating voltage for the excitation control circuit 101. The first output terminal of the excitation control circuit 101 is connected to the input terminal of the generator controller 103, and is used to output the charging status of the power module 104 to the generator controller 103, enabling the detection of the charging status of the power module 104 and timely detection of charging faults. The second input terminal of the excitation control circuit 101 is connected to the output terminal of the generator controller 103, and is used to receive the current control signal output by the generator controller 103, thereby achieving constant current controllability of the excitation current. The second output terminal of the excitation control circuit 101 is connected to the first terminal of the excitation coil 102 and is used to output the excitation current to the excitation coil 102 so that the current flowing through the excitation coil 102 is a stable value, thereby improving the stability of the excitation current.

[0025] In this embodiment, the excitation coil 102 is a generator excitation coil. In this embodiment, the generator controller 103 can be an on-board controller (ECU) or a generator control unit (GCU). The power module 104 can be an on-board battery.

[0026] Figure 2 This is the circuit diagram for the excitation control circuit, for reference. Figure 2The excitation control circuit 101 in this embodiment includes: a constant current source module 201, a negative feedback control module 202, and a charging state detection module 203. The input terminal of the constant current source module 201 receives a current control signal, and its output terminal is connected to the input terminal of the negative feedback control module 202. The constant current source module 201 provides a constant current to the negative feedback control module 202. The output terminal of the negative feedback control module 202 outputs an excitation current to the excitation coil 102 to provide a stable excitation current. The input terminal of the charging state detection module 203 is connected to the output terminal of the negative feedback control module 202 to detect the charging state of the power supply module 104 based on the output voltage of the negative feedback control module 202. The output terminal of the charging state detection module 203 outputs the charging state of the power supply module 104.

[0027] In this embodiment, the constant current source module 201 includes: amplifier U1, first resistor R1, second resistor R2, third resistor R3 and first switch Q1. The positive input terminal of amplifier U1 is the input terminal of constant current source module 201. The inverting output terminal of amplifier U1 is connected to the first terminal of second resistor R2. The second terminal of second resistor R2 is connected to the first terminal of third resistor R3 and the emitter of first switch Q1. The second terminal of third resistor R3 is grounded.

[0028] In this embodiment, the output terminal of amplifier U1 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the base of the first switching transistor Q1, the collector of the first switching transistor Q1 is the output terminal of the constant current source module 201, and the collector of the first switching transistor Q1 is connected to the input terminal of the negative feedback control module 202 through the fourth resistor R4.

[0029] In this embodiment, the current control signal received at the positive input terminal of amplifier U1 is assumed to be an analog input voltage signal V. in Then the inverting input of U1 will follow the analog voltage value V. in When V in When stable, the base current of Q1 is only affected by V. in Control, collector current I of Q1 c-Q1 Also subject to V in Control, that is, when V in Under unchanged conditions, the collector current of Q1 is a constant value, exhibiting the characteristics of a constant current source, and the current output of the constant current source module 201 is a constant value.

[0030] In this embodiment, a fifth resistor R5 is also connected between the inverting input terminal of amplifier U1 and the power supply module 104 to limit current.

[0031] In this embodiment, the negative feedback control module 202 includes: a second switch Q2, a third switch Q3, a fourth switch Q4, a sixth resistor R6, and a seventh resistor R7. The base of the second switch Q2 is the input terminal of the negative feedback control module 202, the emitter of the second switch Q2 is connected to the first terminal of the sixth resistor R6, the second terminal of the sixth resistor R6 is connected to the power supply module 104, and the base of the third switch Q3 is connected to the base and collector of the second switch Q2.

[0032] In this embodiment, the first end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, the second end of the seventh resistor R7 is connected to the emitter of the third switch Q3 and the collector of the fourth switch Q4, the base of the fourth switch Q4 is connected to the collector of the third switch Q3, the emitter of the fourth switch Q4 is the output terminal of the negative feedback control module 202, and the emitter of the fourth switch Q4 is connected to the excitation coil 102 through the anti-reverse current diode D1 to avoid backflow.

[0033] In this embodiment, the first and fourth switching transistors are of the same type, and the second and third switching transistors are of the same type. (See reference...) Figure 2 The first switch Q1 and the fourth switch Q4 are NPN transistors, and the second switch Q2 and the third switch Q3 are PNP transistors.

[0034] In this embodiment, by Figure 2 It can be seen that the collector current I of Q1 c-Q1 The collector current I equals Q2 c-Q2 With the base current I of Q3 b-Q3 When the impedance of the excitation coil 102 changes, if the current flowing through the excitation coil 102 tends to increase, then the current flowing through R7 increases. From the circuit formed by R6, Q2, Q3, and R7, it can be seen that when the current through R7 increases, the current flowing through R6 also tends to increase. Therefore, the collector current I of Q2... c-Q2 The trend is towards increasing, but due to the collector current I of Q1... c-Q1 Since the total value is constant, the base current I of Q3 is... b-Q3 If it develops in a decreasing direction, then the collector current I of Q3 will subsequently decrease. c-Q3 As it decreases, the base current I of Q4... b-Q4 As it decreases, the collector current I of Q4... c-Q4Consequently, it decreases. In summary, the change in excitation current when the impedance of the excitation coil 102 changes is a process of negative feedback. Therefore, when the analog input voltage signal Vin remains constant, the current flowing through the excitation coil 102 is basically a stable value. That is to say, no matter how the impedance of the excitation coil 102 changes, when the current control signal is stable, the excitation current output by the negative feedback control module 202 has good stability.

[0035] In this embodiment, the charging status detection module 203 includes an eighth resistor R8 and a ninth resistor R9. The first end of the eighth resistor R8 is connected to the emitter of the fourth switch Q4, the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is grounded, and the second end of the eighth resistor R8 is the output terminal of the electric vehicle charging status detection module 203.

[0036] In this embodiment, since the charging status detection module 203 is connected to the output terminal of the negative feedback control module 202, the voltage division across the resistor of the charging status detection module 203 can be used to detect whether the generator is charging the battery. When the generator is charging the battery normally, the excitation current is stable, and the voltage division value across R9 is also relatively stable. At this time, the charging status is normal charging. However, when the generator rotor rotates normally but cannot charge the battery normally, for example, when the charging line is disconnected, the generator is unloaded. At this time, the generator terminal voltage will float higher, and the current output from the generator controller 103 to the excitation coil 102 will become very small. The voltage drop between the collector and emitter of Q4 increases, resulting in a very small voltage division value across R9. The generator controller 103 senses that the voltage division value of R9 is too small and issues a charging failure status, reminding the entire generator system whether there is a fault.

[0037] Figure 3 Another circuit diagram of an excitation current supply circuit is shown, for reference. Figure 3 The excitation current supply circuit of this embodiment also includes a generator main winding 301 and a load circuit 302, both of which are connected to the output terminal of the power module 104. The motor main winding is connected to the power module 104 through a three-phase rectifier bridge, and the three voltage ports of the motor main winding are respectively connected to the three arms of the rectifier bridge. The rectified voltage is used to charge the battery of the power module 104.

[0038] In this embodiment, a freewheeling diode D2 is also connected in parallel across the two ends of the excitation coil 102, which can provide a discharge path for the reverse electromotive force, discharge the reverse electromotive force, prevent damage to the excitation control circuit 101, and play a role in protecting the circuit.

[0039] In this embodiment, when the generator main winding 301 is working, that is, when the generator has a speed value, if the generator controller 103 senses that the battery is not being charged, the generator controller 103 can actively cut off the excitation current to protect other electrical equipment connected to the generator line, such as the electrical equipment on the load circuit 302.

[0040] In another example, the current value on the excitation coil 102 can be collected, such as by setting a sampling resistor on the circuit where the excitation coil 102 is located, to collect the excitation current value. The excitation current can then be dynamically adjusted in a closed loop based on the collected excitation current value to achieve the purpose of stabilizing the excitation current.

[0041] The above describes an excitation current supply circuit provided in this embodiment, which has a simple structure and low cost. The excitation control circuit 101 receives the power supply voltage output from the power module 104 and outputs the charging status of the power module 104 to the generator controller 103, enabling the detection of the charging status of the power module 104 and timely identification of charging faults. The excitation control circuit 101 receives the current control signal output from the generator controller 103 to achieve constant and controllable excitation current. The excitation control circuit 101 outputs excitation current to the excitation coil 102 to ensure a stable current flowing through the excitation coil 102, thereby improving the stability of the excitation current.

[0042] This embodiment also provides an electronic device, for reference. Figure 4 The electronic device 400 includes the excitation current supply circuit 401 provided in the above embodiments. The electronic device 400 provided in this embodiment has the same inventive concept and similar beneficial effects as the excitation current supply circuit provided in the above embodiments, and will not be described again here to avoid redundancy.

[0043] It should be noted that:

[0044] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this application is not directed to any particular programming language. It should be understood that the content of this application described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of this application.

[0045] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0046] Similarly, it should be understood that, in order to simplify this application and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of this application, various features of this application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0047] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0048] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0049] The various component embodiments of this application can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components in the virtual machine creation system according to the embodiments of this application. This application can also be implemented as a device or system program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such an implementation of this application can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0050] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An excitation current supply circuit, characterized in that, The excitation current supply circuit includes: an excitation control circuit, an excitation coil, a generator controller, and a power module; The first input terminal of the excitation control circuit is connected to the output terminal of the power supply module and is used to receive the power supply voltage output by the power supply module. The first output terminal of the excitation control circuit is connected to the input terminal of the generator controller, and is used to output the charging status of the power module to the generator controller. The second input terminal of the excitation control circuit is connected to the output terminal of the generator controller and is used to receive the current control signal output by the generator controller. The second output terminal of the excitation control circuit is connected to the first terminal of the excitation coil and is used to output excitation current to the excitation coil. The excitation control circuit includes a constant current source module and a negative feedback control module. The input terminal of the constant current source module is used to receive the current control signal, and the output terminal of the constant current source module is connected to the input terminal of the negative feedback control module to provide a constant current to the negative feedback control module. The output terminal of the negative feedback control module is used to output the excitation current to the excitation coil. The negative feedback control module includes: a second switch, a third switch, a fourth switch, a sixth resistor, and a seventh resistor; the base of the second switch is the input terminal of the negative feedback control module, the emitter of the second switch is connected to the first terminal of the sixth resistor, and the second terminal of the sixth resistor is connected to the power supply module; the base of the third switch is connected to the base and collector of the second switch; the first terminal of the seventh resistor is connected to the second terminal of the sixth resistor, and the second terminal of the seventh resistor is connected to the emitter of the third switch and the collector of the fourth switch; the base of the fourth switch is connected to the collector of the third switch, the emitter of the fourth switch is the output terminal of the negative feedback control module, and the emitter of the fourth switch is connected to the excitation coil through a diode.

2. The excitation current supply circuit according to claim 1, characterized in that, The excitation control circuit also includes: a charging status detection module; The input terminal of the charging status detection module is connected to the output terminal of the negative feedback control module; The output terminal of the charging status detection module is used to output the charging status of the power supply module.

3. The excitation current supply circuit according to claim 2, characterized in that, The constant current source module includes: an amplifier, a first resistor, a second resistor, a third resistor, and a first switching transistor; The positive input terminal of the amplifier is the input terminal of the constant current source module, the negative input terminal of the amplifier is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the first terminal of the third resistor and the emitter of the first switching transistor, and the second terminal of the third resistor is grounded. The output terminal of the amplifier is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the base of the first switching transistor, the collector of the first switching transistor is the output terminal of the constant current source module, and the collector of the first switching transistor is connected to the input terminal of the negative feedback control module through the fourth resistor.

4. The excitation current supply circuit according to claim 3, characterized in that, A fifth resistor is also connected between the inverting input of the amplifier and the power supply module.

5. The excitation current supply circuit according to claim 2, characterized in that, The charging status detection module includes: an eighth resistor and a ninth resistor; The first end of the eighth resistor is connected to the emitter of the fourth switch, the second end of the eighth resistor is connected to the first end of the ninth resistor, the second end of the ninth resistor is grounded, and the second end of the eighth resistor is the output terminal of the charging status detection module.

6. The excitation current supply circuit according to claim 3, characterized in that, The fourth switch and the first switch are of the same type, and the second switch and the third switch are of the same type.

7. The excitation current supply circuit according to claim 1, characterized in that, An anti-reverse current diode is provided between the emitter of the fourth switching transistor and the excitation coil, and a freewheeling diode is connected in parallel across the two ends of the excitation coil.

8. The excitation current supply circuit according to claim 1, characterized in that, The excitation current supply circuit also includes a generator main winding and a load circuit, both of which are connected to the output terminal of the power module.

9. An electronic device, characterized in that, The electronic device includes the excitation current supply circuit according to any one of claims 1-8.

Images