Generator circuit control system

Abstract

The present application discloses a generator circuit control system, comprising: a rectifier and filter circuit, a drive and isolation circuit, and a power amplifier circuit. The rectifier and filter circuit and the drive and isolation circuit are connected to the power amplifier circuit, and the drive and isolation circuit comprises two drive control circuits capable of outputting positive excitation and negative excitation. The generator circuit control system provided by the present application uses a dual-channel PWM drive excitation circuit, which can output both positive excitation and negative excitation, thereby solving the problem of an excessively large output voltage change range of existing generators when a heavy inertial load is suddenly applied, especially the heavy inertial load is removed.

Description

A generator circuit control system

[0001] This application claims priority to Chinese Patent Application No. 202411953969.0, filed on December 27, 2024, entitled “A Generator Circuit Control System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of circuit control technology, and more specifically, to a generator circuit control system. Background Technology

[0003] Currently, most existing digital voltage regulation technologies for generators utilize a single-channel PWM (Pulse Width Modulation) drive to control the excitation circuit to output positive excitation, thereby providing positive current to the excitation winding and thus regulating and controlling the power supply output voltage.

[0004] While the aforementioned digital voltage regulation technology can adjust the output voltage in a timely manner when the generator is loaded or unloaded, it can only stabilize the output voltage by reducing the PWM duty cycle to zero to make the excitation current also zero when unloading, especially when there is a large load. This method can meet the transient requirements for voltage regulation rate and recovery time when a small load is suddenly unloaded, but it cannot restore the output voltage to the rated target value in a timely manner when a large load is suddenly unloaded, thus failing to meet the transient requirements for voltage regulation. Summary of the Invention

[0005] In view of the shortcomings of the prior art, this application innovatively provides a generator circuit control system that can solve the technical problem that the voltage regulation system in the prior art cannot adjust the voltage in time when a large load is suddenly unloaded.

[0006] To achieve the aforementioned technical objectives, this application discloses a generator circuit control system, comprising: a rectifier and filter circuit, a drive isolation circuit, and a power amplifier circuit, wherein the rectifier and filter circuit and the drive isolation circuit are connected to the power amplifier circuit, wherein...

[0007] The drive isolation circuit includes two drive control circuits, which can output positive excitation and negative excitation.

[0008] Furthermore, the rectifier and filter circuit includes a three-phase rectifier bridge and an electrolytic capacitor. The three-phase rectifier bridge is used to connect to the output terminal of the generator. The three-phase rectifier bridge is connected to the electrolytic capacitor, and the electrolytic capacitor is connected to the power amplifier circuit.

[0009] Furthermore, the power amplifier circuit includes multiple MOSFETs, wherein the positive terminal of the DC power supply output by the rectifier and filter circuit is connected to MOSFETs Q1 and Q2, and the positive terminal of the DC power supply output by the rectifier and filter circuit is connected to the drains of MOSFETs Q1 and Q2.

[0010] The negative terminal of the DC power supply output by the rectifier and filter circuit is grounded and connected to MOSFETs Q3 and Q4. The negative terminal of the DC power supply output by the rectifier and filter circuit is connected to the source terminals of MOSFETs Q3 and Q4.

[0011] Furthermore, the source of the MOS transistor Q1 is connected to the drain of the MOS transistor Q3, and a positive output F+ of the excitation power is formed between the source of the MOS transistor Q1 and the drain of the MOS transistor Q3.

[0012] Furthermore, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q4, and a negative output F- of the excitation power is formed between the source of the MOS transistor Q2 and the drain of the MOS transistor Q4.

[0013] Furthermore, the drive isolation circuit includes a first drive control circuit, which includes transistor Q5, optocoupler D5, and transistor Q6, wherein...

[0014] The base of transistor Q5 is used to connect to the first signal source. Power supply VCC1 is connected to the positive terminal of the light-emitting diode of optocoupler D5 through resistor R1. The negative terminal of the light-emitting diode of optocoupler D5 is connected to the negative terminal of transistor Q5. The emitter of transistor Q5 is grounded.

[0015] The power supply VCC2 is connected to the collector of the phototransistor of the optocoupler D5, the emitter of the phototransistor of the optocoupler D5 is connected to the base of the transistor Q6, and is grounded through resistor R2.

[0016] The power supply VCC2 is also connected to the collector of the transistor Q6, and the emitter of the transistor Q6 is grounded through resistor R3.

[0017] The emitter of transistor Q6 is also connected to the gates of MOS transistors Q1 and Q4 in the power amplifier circuit.

[0018] Furthermore, the drive isolation circuit includes a second drive control circuit, which includes transistor Q7, optocoupler D6, and transistor Q8, wherein...

[0019] The base of transistor Q7 is used to connect to the first signal source. Power supply VCC1 is connected to the positive terminal of the light-emitting diode of optocoupler D6 through resistor R4. The negative terminal of the light-emitting diode of optocoupler D6 is connected to the negative terminal of transistor Q7. The emitter of transistor Q7 is grounded.

[0020] The power supply VCC2 is connected to the collector of the phototransistor of the optocoupler D6, the emitter of the phototransistor of the optocoupler D6 is connected to the base of the transistor Q8, and is grounded through resistor R5.

[0021] The power supply VCC2 is also connected to the collector of the transistor Q8, and the emitter of the transistor Q8 is grounded through resistor R6.

[0022] The emitter of transistor Q8 is also connected to the gate of MOS transistors Q2 and Q3 in the power amplifier circuit.

[0023] The beneficial effects of this application are as follows:

[0024] The generator circuit control system provided in this application utilizes a dual-path PWM drive excitation circuit, which can output both positive and negative excitation. This solves the problem of excessive voltage variation in existing generators when suddenly applied or removed from large inertial loads. Attached Figure Description

[0025] Figure 1 shows a structural block diagram of the generator circuit control system according to an embodiment of this application;

[0026] Figure 2 shows a schematic diagram of the rectifier filter circuit and the power amplifier circuit according to an embodiment of this application;

[0027] Figure 3 shows a schematic diagram of the drive isolation circuit according to an embodiment of this application. Detailed Implementation

[0028] The generator circuit control system provided in this application will be explained and described in detail below with reference to the accompanying drawings.

[0029] In the field of generator technology, digital voltage regulation is a crucial and indispensable aspect of its operation. Its performance directly affects the safe and stable operation of the generator system and determines the generator's output voltage recovery capability under no-load or sudden application / discharge of large inertial loads. One of the most important aspects of digital voltage regulation technology is providing real-time and appropriate excitation current to the generator's excitation windings, thereby regulating and controlling the power output to ensure that the generator's output voltage is consistently maintained at the target voltage.

[0030] The generator circuit control system provided in this application utilizes a dual-path PWM drive excitation circuit, which can output both positive and negative excitation. This solves the problem of excessive voltage variation in existing generators when suddenly applied or removed from large inertial loads.

[0031] In some embodiments, this application provides a generator circuit control system, as shown in FIG1, including: a rectifier filter circuit, a drive isolation circuit and a power amplifier circuit. The rectifier filter circuit and the drive isolation circuit are connected to the power amplifier circuit. The drive isolation circuit includes two drive control circuits that can output positive excitation and negative excitation.

[0032] Rectifier and filter circuit: The three-phase AC voltage output from the generator is used as input. After passing through a three-phase bridge rectifier, it is converted into a DC voltage with large ripple. Then, it is filtered by an electrolytic capacitor to become a relatively stable DC voltage as the excitation power supply for output.

[0033] Drive isolation circuit: The two PWM signals output by the CPU are used as inputs, and after being isolated by optocouplers and amplified by the drive, they are used as drive signals for output.

[0034] Power amplifier circuit: The DC voltage output from the rectifier and filter circuit is used as the excitation power supply, and the PWM signal output from the PWM drive isolation circuit is used as the drive signal. After power conversion by four power MOSFETs connected in series and parallel, a regular positive (reverse) pulsating current is output to the excitation winding.

[0035] In some embodiments, as shown in Figure 2, the rectifier and filter circuit includes a three-phase rectifier bridge and an electrolytic capacitor. The three-phase rectifier bridge is connected to the output terminal of the generator, and the three-phase rectifier bridge is connected to the electrolytic capacitor, which is connected to the power amplifier circuit. The three-phase AC voltage output by the generator is used as input. After passing through the three-phase rectifier bridge U1, it becomes a DC voltage with large ripple. Then, after being filtered by the electrolytic capacitor C1, it becomes a relatively stable DC voltage as the excitation power supply for output. In this embodiment, the rectifier and filter circuit uses a three-phase rectifier bridge that can handle high voltage input and high current output, which can meet the requirements of large excitation current output. A high-voltage electrolytic capacitor is used for voltage filtering, enabling it to output a relatively stable DC voltage as the excitation power supply input. Optionally, the input voltage of the three-phase rectifier bridge selected for the rectifier and filter circuit must meet the withstand voltage requirements of the three-phase AC voltage output by the generator, and its output current must also meet the requirements of the generator's rated excitation current. For example, the rectifier bridge model is: SKBPC3516; the withstand voltage of the DC filter capacitor must also meet the withstand voltage requirements of the excitation power supply voltage after rectification by the rectifier bridge. For example, the filter capacitor model is: LS227M450O30RR0VH2SP0.

[0036] In some embodiments, as shown in FIG2, the power amplifier circuit includes multiple MOSFETs. The positive terminal of the DC power supply output from the rectifier and filter circuit is connected to MOSFETs Q1 and Q2, and the positive terminal of the DC power supply output from the rectifier and filter circuit is connected to the drains of MOSFETs Q1 and Q2. In this embodiment, four MOSFETs are included: MOSFETs Q1, Q2, Q3, and Q4. The negative terminal of the DC power supply output from the rectifier and filter circuit is grounded and connected to MOSFETs Q3 and Q4, and the negative terminal of the DC power supply output from the rectifier and filter circuit is connected to the sources of MOSFETs Q3 and Q4.

[0037] Optionally, the source of MOSFET Q1 is connected to the drain of MOSFET Q3, forming a positive excitation power output F+ between the source of MOSFET Q1 and the drain of MOSFET Q3; the source of MOSFET Q2 is connected to the drain of MOSFET Q4, forming a negative excitation power output F- between the source of MOSFET Q2 and the drain of MOSFET Q4. In this embodiment, four power MOSFETs connected in series and parallel are used to perform power conversion on the excitation power supply, enabling it to output a positive or negative pulsating current, thereby providing DC excitation power input to the exciter. Optionally, the MOSFETs must meet the withstand voltage requirements of the excitation power supply after rectification by the rectifier bridge, and their continuous current must also meet the requirements of the generator's rated excitation current. For example, the MOSFET model STF26NM60N can be selected.

[0038] In some embodiments, as shown in FIG3, the drive isolation circuit includes a first drive control circuit, which includes transistor Q5, optocoupler D5, and transistor Q6. The base of transistor Q5 is used to connect to a first signal source. Power supply VCC1 is connected to the positive terminal of the light-emitting diode of optocoupler D5 through resistor R1. The negative terminal of the light-emitting diode of optocoupler D5 is connected to the negative terminal of transistor Q5. The emitter of transistor Q5 is grounded. Power supply VCC2 is connected to the collector of the phototransistor of optocoupler D5. The emitter of the phototransistor of optocoupler D5 is connected to the base of transistor Q6 and is grounded through resistor R2. Power supply VCC2 is also connected to the collector of transistor Q6. The emitter of transistor Q6 is grounded through resistor R3. The emitter of transistor Q6 is also connected to the gate of MOSFETs Q1 and Q4 in the power amplifier circuit.

[0039] When the CPU outputs a high-level PWM1A signal, transistor Q5 is turned on, the LED at the front end of the optocoupler is turned on and emits light, the phototransistor at the back end of the optocoupler is turned on, and transistor Q6 is turned on. At this time, the PWM1 signal output is also high-level. When the CPU outputs a low-level PWM1A signal, transistor Q5 is turned off, the LED at the front end of the optocoupler D5 is turned off and does not emit light, the phototransistor at the back end of the optocoupler D5 is turned off, and transistor Q6 is turned off. At this time, the PWM1 signal output is also low-level.

[0040] As shown in Figure 3, the drive isolation circuit includes a second drive control circuit, which includes transistor Q7, optocoupler D6, and transistor Q8. The base of transistor Q7 is connected to the first signal source. Power supply VCC1 is connected to the positive terminal of the LED of optocoupler D6 via resistor R4. The negative terminal of the LED of optocoupler D6 is connected to the negative terminal of transistor Q7. The emitter of transistor Q7 is grounded. Power supply VCC2 is connected to the collector of the phototransistor of optocoupler D6. The emitter of the phototransistor of optocoupler D6 is connected to the base of transistor Q8 and grounded via resistor R5. Power supply VCC2 is also connected to the collector of transistor Q8. The emitter of transistor Q8 is grounded via resistor R6. The emitter of transistor Q8 is also connected to the gate of MOSFETs Q2 and Q3 in the power amplifier circuit. Optionally, the optocoupler D5 (D6) should have good conduction characteristics, that is, the lead-out delay time should be small, and it must meet the requirement of being less than the time corresponding to the PWM output frequency. For example, the optocoupler model is PC817C.

[0041] When the CPU outputs a high-level PWM2A signal, transistor Q7 is turned on, the LED at the front end of optocoupler D6 is turned on and emits light, the phototransistor at the rear end of optocoupler D6 is turned on, and transistor Q8 is turned on. At this time, the PWM2 signal output is also high-level. When the CPU outputs a low-level PWM2A signal, transistor Q7 is turned off, the LED at the front end of optocoupler D6 is turned off and does not emit light, the phototransistor at the rear end of optocoupler D6 is turned off, and transistor Q8 is turned off. At this time, the PWM2 signal output is also low-level.

[0042] When PWM1 is high and PWM2 is low, MOSFETs Q1 and Q4 are turned on and Q2 and Q3 are turned off. At this time, the excitation current flows from F+ to F-, and the output is positive excitation. When PWM1 is low and PWM2 is high, MOSFETs Q2 and Q3 are turned on and Q1 and Q4 are turned off. At this time, the excitation current flows from F- to F+, and the output is negative excitation.

[0043] The method for solving the problem of voltage overshoot during sudden load shedding in generators, designed in this application, is mainly used in the field of digital voltage regulation technology for generators. Its dynamic response speed and static stability must be high. Therefore, it cleverly utilizes two-way PWM drive to control four power MOSFETs connected in series and parallel. It can perform power conversion on the excitation power supply according to different load conditions of the generator, so that it can output positive or negative pulsating current to act on the exciter, thereby offsetting the changes in output voltage that are too low or too high when the generator suddenly adds or removes a large inertial load.

[0044] The method for solving the problem of voltage overshoot due to sudden load shedding in generators designed in this application has a simple circuit design, fast dynamic response speed, and strong practicality.

[0045] It should be noted that, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0046] For ease of explanation, in the various embodiments of this application, the same reference numerals denote the same components, and for brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0047] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0048] It should be understood that the specific examples in the embodiments of this application are only for the purpose of helping those skilled in the art to better understand the embodiments of this application, and are not intended to limit the scope of the embodiments of this application. Those skilled in the art can make various improvements and modifications based on the above embodiments, and all such improvements or modifications fall within the protection scope of this application.

[0049] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should 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. A generator circuit control system, characterized in that, include: The system includes a rectifier filter circuit, a drive isolation circuit, and a power amplifier circuit, wherein the rectifier filter circuit and the drive isolation circuit are connected to the power amplifier circuit. The drive isolation circuit includes two drive control circuits, which can output positive excitation and negative excitation.

2. The generator circuit control system according to claim 1, characterized in that, The rectifier and filter circuit includes a three-phase rectifier bridge and an electrolytic capacitor. The three-phase rectifier bridge is used to connect to the output terminal of the generator. The three-phase rectifier bridge is connected to the electrolytic capacitor, and the electrolytic capacitor is connected to the power amplifier circuit.

3. The generator circuit control system according to claim 2, characterized in that, The power amplifier circuit includes multiple MOSFETs, wherein the positive terminal of the DC power supply output by the rectifier and filter circuit is connected to MOSFETs Q1 and Q2, and the positive terminal of the DC power supply output by the rectifier and filter circuit is connected to the drain of MOSFETs Q1 and Q2. The negative terminal of the DC power supply output by the rectifier and filter circuit is grounded and connected to MOSFETs Q3 and Q4. The negative terminal of the DC power supply output by the rectifier and filter circuit is connected to the source terminals of MOSFETs Q3 and Q4.

4. The generator circuit control system according to claim 3, characterized in that, The source of the MOSFET Q1 is connected to the drain of the MOSFET Q3, and a positive output F+ of the excitation power is formed between the source of the MOSFET Q1 and the drain of the MOSFET Q3.

5. The generator circuit control system according to claim 4, characterized in that, The source of the MOSFET Q2 is connected to the drain of the MOSFET Q4, and a negative output F- of the excitation power is formed between the source of the MOSFET Q2 and the drain of the MOSFET Q4.

6. The generator circuit control system according to claim 5, characterized in that, The drive isolation circuit includes a first drive control circuit, which includes transistor Q5, optocoupler D5, and transistor Q6. The base of transistor Q5 is used to connect to the first signal source. Power supply VCC1 is connected to the positive terminal of the light-emitting diode of optocoupler D5 through resistor R1. The negative terminal of the light-emitting diode of optocoupler D5 is connected to the negative terminal of transistor Q5. The emitter of transistor Q5 is grounded. The power supply VCC2 is connected to the collector of the phototransistor of the optocoupler D5, the emitter of the phototransistor of the optocoupler D5 is connected to the base of the transistor Q6, and is grounded through resistor R2. The power supply VCC2 is also connected to the collector of the transistor Q6, and the emitter of the transistor Q6 is grounded through resistor R3. The emitter of transistor Q6 is also connected to the gates of MOS transistors Q1 and Q4 in the power amplifier circuit.

7. The generator circuit control system according to claim 6, characterized in that, The drive isolation circuit includes a second drive control circuit, which includes transistor Q7, optocoupler D6, and transistor Q8. The base of transistor Q7 is used to connect to the first signal source. Power supply VCC1 is connected to the positive terminal of the light-emitting diode of optocoupler D6 through resistor R4. The negative terminal of the light-emitting diode of optocoupler D6 is connected to the negative terminal of transistor Q7. The emitter of transistor Q7 is grounded. The power supply VCC2 is connected to the collector of the phototransistor of the optocoupler D6, the emitter of the phototransistor of the optocoupler D6 is connected to the base of the transistor Q8, and is grounded through resistor R5. The power supply VCC2 is also connected to the collector of the transistor Q8, and the emitter of the transistor Q8 is grounded through resistor R6. The emitter of transistor Q8 is also connected to the gate of MOS transistors Q2 and Q3 in the power amplifier circuit.

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