CN221305778U - Digital generator excitation control equipment - Google Patents

Abstract

The utility model provides a digital generator excitation control device, comprising: an MCU data processing unit; a power module; an external control module; a sampling module; a protection module; an alarm module; the storage module is connected with the MCU data processing unit and is used for storing real-time data, operation setting parameters and alarm information in the operation process of the system; the communication module is connected with the MCU data processing unit and is used for communicating with an upper computer; the MCU data processing unit is used for processing signals of the external control module, receiving voltage and current sampled by the sampling module, calculating the exciting current according to a program of the MCU data processing unit, and finally outputting corresponding exciting current through the exciting module to achieve the purpose of stabilizing the output voltage of the generator.

Description

Digital generator excitation control equipment

Technical Field

The utility model relates to the field of generators, in particular to digital generator excitation control equipment.

Background

Sites such as ships and mines cannot acquire electric energy from a power grid, and a diesel generator is required to provide electric energy. At this time, stability of the output power of the generator is particularly important. In order to stabilize the output of the generator, the exciting current is often controlled.

Analog generator excitation regulating devices and digital generator excitation regulating devices currently exist on the market. The excitation regulation of the analog generator does not contain a data processing chip, the equipment is simple in structure and low in cost, does not have complete operation parameter setting and feedback functions, has insufficient control precision, and is applicable to limited output power of the generator; the digital generator excitation regulating device comprises a processing chip, is complex in structure and high in cost, has the functions of complete and extensible parameter setting and feedback, and is high in control precision and wide in application occasions. In the power supply, a direct access voltage reduction chip or a voltage stabilizing tube is adopted, the loss of the chip is extremely high, the service life of the system is very short, and a mode of enlarging the capacitance by a rectifier bridge is adopted more, but due to the inherent capacity loss property of the large capacitance, certain hidden danger of power supply imbalance exists, and the power supply system is not isolated from the rear end, so that the normal operation of the chip is easily interfered; in the excitation loop, a complex driving circuit is designed no matter an MOS tube, a silicon controlled tube or an IGBT is adopted, wherein a digital excitation adjusting device also uses a driving chip, and the response speed and the stability of the system are reduced to a certain extent.

Disclosure of utility model

The utility model aims to provide digital generator excitation control equipment.

The utility model aims to solve the problems in the prior art.

Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

A digital generator excitation control apparatus comprising: an MCU data processing unit; the power module is connected with the MCU data processing unit and provides direct-current voltage for the whole system; the external control module is connected with the MCU data processing unit and is used for adjusting various parameters of the system through external voltage or resistance change; the sampling module is connected with the MCU data processing unit and is used for collecting voltage, current and frequency in the running process of the generator, collecting system temperature and collecting exciting current output by digital generator excitation control equipment; the protection module is connected with the MCU data processing unit and is used for performing overvoltage protection, overcurrent protection, low-frequency protection and over-temperature protection on the generator and also used for performing overcurrent protection and over-temperature protection on exciting current of digital generator excitation control equipment; the alarm module is connected with the MCU data processing unit and is used for realizing overvoltage alarm, overcurrent alarm, frequency loss alarm and over-temperature alarm of the generator and also used for carrying out overcurrent alarm and over-temperature alarm on exciting current of digital generator excitation control equipment; the excitation module is connected with the MCU data processing unit and is used for realizing the functions of a PWM driving circuit thyristor and excitation output; the storage module is connected with the MCU data processing unit and is used for storing real-time data, operation setting parameters and alarm information in the operation process of the system; the communication module is connected with the MCU data processing unit and is used for communicating with an upper computer; the MCU data processing unit is used for processing signals of the external control module, receiving voltage and current sampled by the sampling module, calculating the exciting current according to a program of the MCU data processing unit, and finally outputting corresponding exciting current through the exciting module to achieve the purpose of stabilizing the output voltage of the generator.

The beneficial effects of the utility model are as follows:

In the utility model, a switching power supply type power supply circuit based on a high-frequency transformer is designed, although the power supply at the front end of the circuit is still a rectifier bridge plus a capacitor, the capacity change of the capacitor becomes less important due to the use of the high-frequency transformer, the high-frequency transformer transfers the impact of the capacitor, the service life and the impact resistance are far better than those of a voltage reduction chip and a large capacitor, and the potential power supply hazard of the current generator excitation regulating equipment is solved; the utility model designs a special excitation loop, adopts a mode of outputting PWM by a central processing unit to carry out digital control without an additional driving chip, combines the driving circuit and the excitation circuit together, realizes a driving function by using only a plurality of discrete devices, reduces the complexity of the excitation loop and the power supply pressure when excitation is carried out at low voltage, improves the stability of the system and has quick response.

Drawings

FIG. 1 is a schematic block diagram of a digital generator excitation control device of the present utility model;

FIG. 2 is a circuit diagram of a power module according to the present utility model;

Fig. 3 is a circuit diagram of the excitation module of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

In the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown with reference to figures 1 to 3,

A digital generator excitation control apparatus comprising: an MCU data processing unit 1; the power module 2 is connected to the MCU data processing unit 1, and the power module 2 provides direct current voltage for the whole system; the external control module 3 is connected with the MCU data processing unit 1, and the external control module 3 is used for adjusting various parameters of the system through external voltage or resistance change; the sampling module 4 is connected to the MCU data processing unit 1, and the sampling module 4 is used for collecting voltage, current and frequency in the running process of the generator, collecting system temperature and collecting exciting current output by digital generator exciting control equipment; the protection module 5 is connected to the MCU data processing unit 1, and the protection module 5 is used for performing overvoltage protection, overcurrent protection, low-frequency protection and over-temperature protection on the generator and also used for performing overcurrent protection and over-temperature protection on exciting current of digital generator exciting control equipment; the alarm module 6 is connected to the MCU data processing unit 1, and the alarm module 6 is used for realizing overvoltage alarm, overcurrent alarm, frequency loss alarm and overtemperature alarm of the generator and also used for carrying out overcurrent alarm and overtemperature alarm on exciting current of digital generator exciting control equipment; the excitation module 7 is connected to the MCU data processing unit 1, and the excitation module 7 is used for realizing the functions of a PWM driving circuit thyristor and excitation output; the storage module 8 is connected with the MCU data processing unit 1, and the storage module 8 is used for storing real-time data, operation setting parameters and alarm information in the operation process of the system; the communication module 9 is connected to the MCU data processing unit 1, and the communication module 9 is used for communicating with an upper computer; the MCU data processing unit 1 is used for processing signals of the external control module, receiving voltage and current sampled by the sampling module, calculating the exciting current according to a program of the MCU data processing unit, and finally outputting corresponding exciting current through the exciting module to achieve the purpose of stabilizing the output voltage of the generator.

The power module includes:

The input capacitor C1, one end of the input capacitor C1 is connected with the first pin of the high-frequency transformer U1, and the other end of the input capacitor C1 is grounded;

The AC-DC control chip U2 is of a chip model VIPRE A and is used for automatically adjusting the frequency of the high-frequency transformer U1, so that the output voltage of the high-frequency transformer U1 is ensured to be stabilized under the condition that different voltages of the high-frequency transformer U1 are input;

The first pin of the high-frequency transformer U1 is a direct-current voltage input end and is connected with the positive end of the capacitor C1; the second pin and the eighth pin of the high-frequency transformer U1 are empty; the third pin of the high-frequency transformer U1 is connected with the DRAIN1-4 pins of the AC-DC control chip U2; the fourth pin of the high-frequency transformer U1 is connected with the anode of the diode D2, is used for supplying power to the U2 through a resistor R3 and is used as a triode collector electrode input voltage source in the optocoupler; the secondary side of the high-frequency transformer U1 comprises three pairs of voltage output pins, including a sixth pin and a seventh pin, wherein the sixth pin is an anode, and also comprises a ninth pin and a tenth pin, wherein the ninth pin is an anode, and also comprises an eleventh pin and a twelfth pin, and the eleventh pin is an anode;

The power supply module further comprises three paths of direct-current voltage outputs, namely direct-current +5V output voltages, namely +5Vb, and the direct-current +5V output voltages are connected to an eleventh pin and a twelfth pin of the high-frequency transformer U1; the direct current-5V output voltage, marked as-5 Va, is connected to the ninth pin and the tenth pin of the high-frequency transformer U1; the direct current +5V output voltage, marked as +5Va, is connected to a sixth pin and a seventh pin of the high-frequency transformer U1; wherein, -5Va and +5Va are grounded, +5Vb is isolated from other two voltages;

The three paths of direct current voltage-stabilizing output comprises a voltage-stabilizing chip U3, the model is 78M05, a filter capacitor C6 is connected to the input end of the voltage-stabilizing chip U3, and the filter capacitor C7 and a TVS diode D4 are connected to the output end of the voltage-stabilizing chip U3 in parallel; the voltage stabilizing chip U4 is 79M05 in model number, the filter capacitor C9 is connected to the input end of the voltage stabilizing chip U4, and the filter capacitor C10 and the TVS diode D6 are connected to the output end of the voltage stabilizing chip U4 in parallel;

The power supply module further comprises a pi-type filter circuit, the pi-type filter circuit comprises a filter capacitor C13, a filter capacitor C14 and an inductor L1, and a TVS diode D8 is connected to two ends of the filter capacitor C14 in parallel;

The power module further comprises an absorption circuit for filtering and absorbing peak voltage in the switching process of the high-frequency transformer; the absorption circuit comprises an absorption circuit at the input end of the high-frequency transformer, and specific devices comprise a capacitor C3, a resistor R1, a resistor R2 and a diode D1; one end of a capacitor C3 and one end of a resistor R1 are connected to a first pin of the high-frequency transformer U1, the other end of the capacitor C3 and the other end of the resistor R1 are connected to one end of a resistor R2, the other end of the resistor R2 is connected to the negative electrode of a diode D1, and the positive electrode of the diode D1 is connected to a third pin of the high-frequency transformer U1;

The absorption circuit also comprises a high-frequency transformer +5vb output end absorption circuit, and comprises a resistor R4, a capacitor C5 and a diode D3; the absorption circuit also comprises a high-frequency transformer-5 Va output end absorption circuit, and specific devices comprise a resistor R5, a capacitor C8 and a diode D5; the absorption circuit also comprises a high-frequency transformer +5Va output end absorption circuit, and specific devices comprise a resistor R6, a capacitor C11 and a diode D7;

One end of a resistor R6 is connected to a sixth pin of the high-frequency transformer U1, the other end of the resistor R6 is connected to one end of a capacitor C11, the other end of the capacitor C11 is connected to one end of an inductor L1, and the other end of the inductor L1 is connected to the +5Va end; the positive electrode of the diode D7 is connected with one end of the resistor R6, the negative electrode of the diode D7 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is connected with a seventh pin of the high-frequency transformer U1; the filter capacitor C13 and the filter capacitor C14 are both connected in parallel with the capacitor C12;

The power module further comprises a feedback circuit, wherein the feedback circuit is used for feeding back the output voltage of the high-frequency transformer to the AC-DC control chip U2, so that the chip U2 can reasonably adjust the frequency of the high-frequency transformer to achieve the purpose of stabilizing the voltage, and specific devices comprise a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C15, a voltage stabilizing chip U6 and an optocoupler U5; under the action of the voltage stabilizing chip U6, the resistor R7, the resistor R8, the resistor R9 and the resistor R10, when the voltage of the output end of the high-frequency transformer +5Va deviates from 5V, the optocoupler U5 is conducted, a feedback signal is provided for the control chip U2, and the control chip U2 adjusts the frequency of the high-frequency transformer U1 so as to achieve the purpose of stabilizing the output voltage.

The power supply module further comprises a filter capacitor C2 and a filter capacitor C4; one end of the filter capacitor C2 is connected to the FB end of the AC-DC control chip U2, and the other end of the filter capacitor C2 is grounded; one end of the filter capacitor C4 is connected to the VDD end of the AC-DC control chip U2, and the other end of the filter capacitor C4 is grounded.

The power module takes electricity from a capacitor C1 connected with the direct current side of the rectifier bridge, and the alternating current side of the rectifier bridge is connected with the phase voltage of the generator.

The power supply module comprises a flyback high-frequency transformer U1, and the primary side input voltage range of the transformer is between 5V and 500V; the secondary side output has three paths of direct current power supplies, including +5Va, +5Vb and-5Va, wherein +5Vb is isolated from the other two paths of power supplies; the +5Va is subjected to buck conversion to +3.3V and +2.5V to supply power for the MCU data processing unit; the +5Va and-5 Va supply power to the sampling module.

The power supply module further comprises a control chip U2, a voltage stabilizing chip U3 and a voltage stabilizing chip U4, wherein the control chip U2 is VIPER22A, and the chip is used for adjusting the pulse of the high-frequency transformer U1 to enable the high-frequency transformer U1 to output a specific voltage; the voltage stabilizing chip U3 is 78M05 and is used for stabilizing the voltage to +5V; the voltage stabilizing chip U4 is 79M05 and is used for stabilizing the voltage to be-5V.

The central processing unit of the MCU data processing unit is a 32-bit singlechip.

The external control module can realize the voltage lifting function, the power factor adjusting function and the frequency adjusting function aiming at the generator, and can also realize the setting of the adjusting sensitivity and the setting of the low-frequency protection value aiming at the digital generator excitation control equipment; the specific external control mode is an external potentiometer or an external direct current power supply.

The sampling module is used for measuring the output voltage of the generator, the output current of the generator, the output frequency of the generator and the excitation current output by the digital generator excitation control equipment.

The protection module is used for realizing low-frequency protection of the generator, overvoltage protection of the generator, overcurrent protection of exciting current and over-temperature protection of the system.

The alarm module is used for realizing low-frequency alarm of the generator, overvoltage alarm of the generator, overcurrent alarm of exciting current and overtemperature alarm of the system; the specific alarm physics is realized as a relay action to light the corresponding alarm indicator lamp.

The power supply input of the excitation module is generator phase voltage, and the effective alternating voltage value range of normal working voltage is 5V-500V alternating current; the output is exciting current, and the output range is direct current 0 to 15A.

The excitation module inputs generator phase voltage, wherein an AC (alternating current) terminal is connected with any one phase of the generator, and a reference ground is connected with a neutral line of the generator; the exciting module comprises an exciting circuit and a PWM driving circuit and is used for realizing the function of exciting current output.

The exciting circuit comprises an inductor L2, a controllable silicon K1, a freewheeling diode D9, a resistor R13 and a capacitor C16, wherein the resistor R13 is used for absorbing interference; the input is generator phase voltage, the voltage range is from 5V to 500V, and the input terminal mark of the circuit diagram is AC; the output is exciting current to the exciting winding of the generator, the marks of the output terminals of the circuit diagram are F+ and F-, wherein F+ is the positive pole of the exciting current, and F-is the negative pole of the exciting current.

The exciting circuit is input by AC, and sequentially connected with an inductance L2, an exciting output positive terminal F+, an external generator exciting winding, an exciting output negative terminal F-, a silicon controlled rectifier K1 anode, a silicon controlled rectifier K1 cathode and a reference ground to form an exciting loop; under the action of the filter inductor and the inductance of the exciting winding, the current in the loop cannot be suddenly changed, when the thyristor is conducted, the exciting current in the exciting winding is increased, the output power of the generator is increased, and when the thyristor is turned off, the exciting current in the exciting winding forms a follow current loop through a follow current diode D9, the exciting current is reduced, and the output power of the generator is reduced.

The PWM driving circuit in the excitation module is used for driving the conduction of the silicon controlled rectifier K1, namely, the voltage with adjustable gate-level phase of the silicon controlled rectifier K1 is given.

The PWM driving circuit comprises a resistor R12, a resistor R14 and a diode D10 which are connected in series, the cathode of the diode is connected to the drain electrode of an NMOS tube V1, when the NMOS tube V1 is conducted, the phase voltage of the generator passes through an excitation loop, namely, the phase voltage is input from an AC end and reaches the resistor R12 through an inductor L2 and a generator excitation winding, and then the voltage is added to the gate level of a silicon controlled rectifier K1 through the resistor R14, the diode D10 and the NMOS tube V1, and the silicon controlled rectifier K1 is conducted.

The PWM driving circuit comprises a current limiting resistor R11 connected to an input end AC; the voltage stabilizing diode D11 is connected in parallel between the other end of the current limiting resistor R11 and the reference ground; the device also comprises a triode Q1, wherein the collector electrode of the triode Q1 is connected with the cathode of the voltage-stabilizing diode, and the emitter electrode of the triode Q1 is connected with the reference ground; the current limiting resistor limits the input current to the current of normal operation of the triode Q1 and the NMOS tube V1, and the zener diode D11 stabilizes the input voltage at +12V as the gate driving voltage of the NMOS tube V1; the on and off of the triode Q1 are controlled by PWM signals output by the MCU data processing unit, when the triode Q1 is conducted, the grid electrode of the NMOS tube V1 is not conducted with voltage, and then the controllable silicon K1 is not conducted, and when the triode Q1 is not conducted, the grid electrode of the NMOS tube V1 is the voltage at two ends of the voltage stabilizing diode, and then the NMOS tube V1 is conducted, and then the controllable silicon K1 is conducted.

The excitation module further comprises a pull-down resistor R16 and a pull-down resistor R15; one end of the pull-down resistor R16 is connected with the grid electrode of the NMOS tube V1, the other end of the pull-down resistor R16 is connected with the ground reference for discharging grid charges, one end of the pull-down resistor R15 is connected with the base electrode of the triode Q1, and the other end of the pull-down resistor R15 is connected with the ground reference for discharging base charges.

The storage module is used for storing preset programs and parameters of system operation and also used for storing sampling data and alarm data; is composed of EEPROM chip AT24C08 and its peripheral circuits.

The communication module is used for realizing the communication between the wireless communication system and the corresponding upper computer software, and comprises wired RS485 communication and wireless WIFI communication.

According to the utility model, the sampling module is used for sampling the real-time electrical parameters of the generator and the load, the MCU processing unit is used for processing the sampled data and outputting proper PWM signals according to the requirements, and the exciting current output by the exciting module is regulated, so that the function of regulating and controlling the generator to output stable electric energy is realized. The power supply module of the utility model adopts the switching power supply circuit taking the high-frequency transformer as the core to realize power conversion, and compared with the combination mode of using the rectifying device and the large capacitor in the conventional design, the power supply module has longer service life and more stable and reliable power supply; the exciting module of the utility model only uses one triode, one MOS tube and several resistance and capacitance to realize the PWM driving circuit of the controllable silicon, compared with the conventional design, the driving chip and the peripheral circuit thereof are removed, and the hardware design and the power supply pressure during low-voltage excitation are simplified.

The utility model is connected to a generator, wherein the phase voltage of the generator is connected to a power module 1; the generator voltage and the generator current are connected into the sampling module 4; connecting a 1KΩ potentiometer to a terminal of the external control module 3; connecting the generator excitation winding connection terminal with the output terminals F+ and F-of the excitation module 7; and the RS485 communication line is connected to a communication terminal of the communication module 9.

The engine of the generator is started, the generator starts to output initial voltage, the power module 1 provides power for the system, and the system is started normally; the sampling module 4 detects that the output voltage of the generator is lower than the set voltage (which is initially set to 380V or 400V), and transmits a signal to the MCU data processing unit 2; the MCU data processing unit 2 controls the exciting module 7 to output PWM so as to increase the output voltage of the generator; the sampling module 4 monitors the output voltage of the generator in real time, and when the output voltage reaches a set voltage value, the MCU data processing unit 2 programs the exciting module to stabilize PWM to stabilize the output voltage; the communication module 9 displays various parameters and settings on the upper computer in real time through RS485 communication; the upper computer sets various parameters of the system and stores the parameters in the storage module.

When the load of the generator changes, the output power of the generator also changes, and the MCU data processing unit 2 correspondingly adjusts and stabilizes the output voltage according to the PWM output by the real-time parameter program-controlled excitation module 7.

When the output voltage of the generator needs to be manually adjusted, the upper computer writes in voltage parameters through the communication module 9 to change the output voltage of the generator, and can also change the output voltage of the generator through changing the resistance value of a potentiometer connected to the external control module 3.

When the output current is overlarge due to overlarge load of the generator, the alarm module 6 closes the relay and the overcurrent alarm indicator lamp is turned on, meanwhile, the protection module 5 works, and the system reduces the output voltage of the generator by reducing the exciting current, so that the purpose of protecting the generator is achieved.

The above examples are only for illustrating the technical scheme of the present utility model and are not limiting. It will be understood by those skilled in the art that any modifications and equivalents that do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (10)

1. A digital generator excitation control apparatus, characterized by comprising:

An MCU data processing unit;

The power module is connected with the MCU data processing unit and provides direct-current voltage for the whole system;

The external control module is connected with the MCU data processing unit and is used for adjusting various parameters of the system through external voltage or resistance change;

The sampling module is connected with the MCU data processing unit and is used for collecting voltage, current and frequency in the running process of the generator, collecting system temperature and collecting exciting current output by digital generator excitation control equipment;

The protection module is connected with the MCU data processing unit and is used for performing overvoltage protection, overcurrent protection, low-frequency protection and over-temperature protection on the generator and also used for performing overcurrent protection and over-temperature protection on exciting current of digital generator excitation control equipment;

the alarm module is connected with the MCU data processing unit and is used for realizing overvoltage alarm, overcurrent alarm, frequency loss alarm and over-temperature alarm of the generator and also used for carrying out overcurrent alarm and over-temperature alarm on exciting current of digital generator excitation control equipment;

The excitation module is connected with the MCU data processing unit and is used for realizing the functions of a PWM driving circuit thyristor and excitation output;

The storage module is connected with the MCU data processing unit and is used for storing real-time data, operation setting parameters and alarm information in the operation process of the system;

The communication module is connected with the MCU data processing unit and is used for communicating with an upper computer;

The MCU data processing unit is used for processing signals of the external control module, receiving voltage and current sampled by the sampling module, calculating the exciting current according to a program of the MCU data processing unit, and finally outputting corresponding exciting current through the exciting module to achieve the purpose of stabilizing the output voltage of the generator.

2. The digital generator excitation control apparatus of claim 1, wherein the power supply module comprises:

The input capacitor C1, one end of the input capacitor C1 is connected with the first pin of the high-frequency transformer U1, and the other end of the input capacitor C1 is grounded;

The AC-DC control chip U2 is of a chip model VIPRE A and is used for automatically adjusting the frequency of the high-frequency transformer U1, so that the output voltage of the high-frequency transformer U1 is ensured to be stabilized under the condition that different voltages of the high-frequency transformer U1 are input;

The first pin of the high-frequency transformer U1 is a direct-current voltage input end and is connected with the positive end of the capacitor C1; the second pin and the eighth pin of the high-frequency transformer U1 are empty; the third pin of the high-frequency transformer U1 is connected with the DRAIN1-4 pins of the AC-DC control chip U2; the fourth pin of the high-frequency transformer U1 is connected with the anode of the diode D2, is used for supplying power to the U2 through a resistor R3 and is used as a triode collector electrode input voltage source in the optocoupler; the secondary side of the high-frequency transformer U1 comprises three pairs of voltage output pins, including a sixth pin and a seventh pin, wherein the sixth pin is an anode, and also comprises a ninth pin and a tenth pin, wherein the ninth pin is an anode, and also comprises an eleventh pin and a twelfth pin, and the eleventh pin is an anode;

The power supply module further comprises three paths of direct-current voltage outputs, namely direct-current +5V output voltages, namely +5Vb, and the direct-current +5V output voltages are connected to an eleventh pin and a twelfth pin of the high-frequency transformer U1; the direct current-5V output voltage, marked as-5 Va, is connected to the ninth pin and the tenth pin of the high-frequency transformer U1; the direct current +5V output voltage, marked as +5Va, is connected to a sixth pin and a seventh pin of the high-frequency transformer U1; wherein, -5Va and +5Va are grounded, +5Vb is isolated from other two voltages;

The three paths of direct-current voltage output comprises a voltage stabilizing chip U3, the model is 78M05, a filter capacitor C6 is connected to the input end of the voltage stabilizing chip U3, and the filter capacitor C7 and a TVS diode D4 are connected to the output end of the voltage stabilizing chip U3 in parallel; the voltage stabilizing chip U4 is 79M05 in model number, the filter capacitor C9 is connected to the input end of the voltage stabilizing chip U4, and the filter capacitor C10 and the TVS diode D6 are connected to the output end of the voltage stabilizing chip U4 in parallel;

The power supply module further comprises a pi-type filter circuit, the pi-type filter circuit comprises a filter capacitor C13, a filter capacitor C14 and an inductor L1, and a TVS diode D8 is connected to two ends of the filter capacitor C14 in parallel;

The power module further comprises an absorption circuit for filtering and absorbing peak voltage in the switching process of the high-frequency transformer; the absorption circuit comprises an absorption circuit at the input end of the high-frequency transformer, and specific devices comprise a capacitor C3, a resistor R1, a resistor R2 and a diode D1; one end of a capacitor C3 and one end of a resistor R1 are connected to a first pin of the high-frequency transformer U1, the other end of the capacitor C3 and the other end of the resistor R1 are connected to one end of a resistor R2, the other end of the resistor R2 is connected to the negative electrode of a diode D1, and the positive electrode of the diode D1 is connected to a third pin of the high-frequency transformer U1;

The absorption circuit also comprises a high-frequency transformer +5vb output end absorption circuit, and comprises a resistor R4, a capacitor C5 and a diode D3; the absorption circuit also comprises a high-frequency transformer-5 Va output end absorption circuit, and specific devices comprise a resistor R5, a capacitor C8 and a diode D5; the absorption circuit also comprises a high-frequency transformer +5Va output end absorption circuit, and specific devices comprise a resistor R6, a capacitor C11 and a diode D7;

one end of a resistor R6 is connected to a sixth pin of the high-frequency transformer U1, the other end of the resistor R6 is connected to one end of a capacitor C11, the other end of the capacitor C11 is connected to one end of an inductor L1, and the other end of the inductor L1 is connected to the +5Va end; the positive electrode of the diode D7 is connected with one end of the resistor R6, the negative electrode of the diode D7 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is connected with a seventh pin of the high-frequency transformer U1; the filter capacitor C13 and the filter capacitor C14 are both connected in parallel to the capacitor C12.

3. The digital generator excitation control device according to claim 2, wherein the power module further comprises a feedback circuit, and the feedback circuit is configured to feed back an output voltage of the high-frequency transformer to the AC-DC control chip U2, so that the chip U2 can reasonably adjust a frequency of the high-frequency transformer to achieve a purpose of stabilizing the voltage, and the specific devices include a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C15, a voltage stabilizing chip U6, and an optocoupler U5; under the action of the voltage stabilizing chip U6, the resistor R7, the resistor R8, the resistor R9 and the resistor R10, when the voltage of the output end of the high-frequency transformer +5Va deviates from 5V, the optocoupler U5 is conducted, a feedback signal is provided for the control chip U2, and the control chip U2 adjusts the frequency of the high-frequency transformer U1 so as to achieve the purpose of stabilizing the output voltage.

4. The digital generator excitation control device according to claim 2, wherein the power supply module further includes a filter capacitor C2 and a filter capacitor C4; one end of the filter capacitor C2 is connected to the FB end of the AC-DC control chip U2, and the other end of the filter capacitor C2 is grounded; one end of the filter capacitor C4 is connected to the VDD end of the AC-DC control chip U2, and the other end of the filter capacitor C4 is grounded.

5. The digital generator excitation control device of claim 1, wherein the excitation module input is generator phase voltage, wherein AC is terminated to any one of the generator phases and referenced to ground is terminated to generator neutral; the exciting module comprises an exciting circuit and a PWM driving circuit and is used for realizing the function of exciting current output.

6. The digital generator excitation control apparatus according to claim 5, wherein the excitation circuit includes an inductance L2, a thyristor K1, a flywheel diode D9, and further includes a resistor R13 and a capacitor C16 for absorbing interference; the input is generator phase voltage, the voltage range is from 5V to 500V, and the input terminal mark of the circuit diagram is AC; the output is exciting current to the exciting winding of the generator, the marks of the output terminals of the circuit diagram are F+ and F-, wherein F+ is the positive pole of the exciting current, and F-is the negative pole of the exciting current.

7. The digital generator excitation control device according to claim 6, wherein the excitation circuit is connected with an inductor L2, an excitation output positive terminal f+, an external generator excitation winding, an excitation output negative terminal F-, a silicon controlled rectifier K1 anode, a silicon controlled rectifier K1 cathode and a reference ground in sequence by an AC input to form an excitation loop; under the action of the filter inductor and the inductance of the exciting winding, the current in the loop cannot be suddenly changed, when the thyristor is conducted, the exciting current in the exciting winding is increased, the output power of the generator is increased, and when the thyristor is turned off, the exciting current in the exciting winding forms a follow current loop through a follow current diode D9, the exciting current is reduced, and the output power of the generator is reduced.

8. The digital generator excitation control device according to claim 5, wherein the PWM driving circuit comprises a resistor R12, a resistor R14 and a diode D10 connected in series, the diode cathode is connected to the drain of the NMOS tube V1, and when the NMOS tube V1 is turned on, the generator phase voltage passes through the excitation loop, i.e., is input from the AC terminal, passes through the inductor L2, the generator excitation winding, reaches the resistor R12, and then passes through the resistor R14, the diode D10 and the NMOS tube V1, and the voltage is applied to the gate of the thyristor K1, so that the thyristor K1 is turned on.

9. A digital generator excitation control device according to claim 1, wherein the PWM driving circuit comprises a current limiting resistor R11 connected to the input AC; the voltage stabilizing diode D11 is connected in parallel between the other end of the current limiting resistor R11 and the reference ground; the device also comprises a triode Q1, wherein the collector electrode of the triode Q1 is connected with the cathode of the voltage-stabilizing diode, and the emitter electrode of the triode Q1 is connected with the reference ground; the current limiting resistor limits the input current to the current of normal operation of the triode Q1 and the NMOS tube V1, and the zener diode D11 stabilizes the input voltage at +12V as the gate driving voltage of the NMOS tube V1; the on and off of the triode Q1 are controlled by PWM signals output by the MCU data processing unit, when the triode Q1 is conducted, the grid electrode of the NMOS tube V1 is not conducted with voltage, and then the controllable silicon K1 is not conducted, and when the triode Q1 is not conducted, the grid electrode of the NMOS tube V1 is the voltage at two ends of the voltage stabilizing diode, and then the NMOS tube V1 is conducted, and then the controllable silicon K1 is conducted.

10. The digital generator excitation control apparatus of claim 1, wherein the excitation module further comprises a pull-down resistor R16 and a pull-down resistor R15; one end of the pull-down resistor R16 is connected with the grid electrode of the NMOS tube V1, the other end of the pull-down resistor R16 is connected with the ground reference for discharging grid charges, one end of the pull-down resistor R15 is connected with the base electrode of the triode Q1, and the other end of the pull-down resistor R15 is connected with the ground reference for discharging base charges.