KR101042122B1 - Microprocessor Generator Control System - Google Patents

Abstract

The present invention relates to a microprocessor generator control device, comprising: a voltage adjusting unit for controlling a current applied to a generator exciting coil by comparing a generator PMG power (generator output voltage) with a reference voltage of a comparator; An overvoltage and undervoltage protection unit configured to detect whether the generator output voltage is overvoltage and limit the output in the case of overvoltage and undervoltage; A current inspection unit for detecting an amount of current supplied from the generator and an amount of current detected from the aircraft and recognizing it as a problem of a connection line between the generator and the load if the difference exceeds a reference value; A high frequency and low frequency protection unit for detecting a square wave of a low voltage level applied to a microprocessor using one phase of the generator PMG power and limiting the output when the frequency is higher than the high frequency setting value or lower than the low frequency setting value; And a microprocessor for controlling the operation of each circuit to adjust and maintain the output of the generator. The microprocessor may reduce the number of passive elements used in the generator control device and continuously control speed control for each step. When changing the control range, the existing program that changed the passive elements such as the resistance was modified to adjust the desired control range and time.

Aircraft, Generators, Microprocessors, Excitation Coils, Voltage, Detection, Distribution

Description

Microprocessor Generator Control System

The present invention relates to a microprocessor generator control device, and more particularly, to reduce the number of passive elements used in the generator control device and to modify the program to change the conventional passive elements such as resistance when changing the control range using the microprocessor It relates to a microprocessor generator regulator which is capable of adjusting the desired control range and time.

Conventional generator control device used a variable resistor, a power drive, a resistor to adjust the generator speed when using a passive element to detect the generator control and status, and used each switch and relay for operation by mode. In addition, it is configured to sense and control the voltage and amount of current through the resistance from the current sensor for protection function and state detection.

In order to solve the above problems, the present invention is to provide a microprocessor generator control apparatus capable of reducing the number of passive elements used in the generator control device and continuously controlling the speed control for each step.

In addition, another technical problem to be achieved by the present invention, a microprocessor generator control device that can adjust the desired control range and time by modifying the program to change the conventional passive elements such as resistance when changing the control range using a microprocessor To present.

In addition, another technical problem to be achieved by the present invention is to provide a microprocessor generator control device that can significantly reduce the size and weight of the generator by using a minimum of switches, resistors, capacitors, inductors, relays, etc. using a microprocessor. It is.

In addition, another technical problem to be achieved by the present invention, used as a brushless (Brushless) alternator control device and serves to adjust and maintain the output of the generator, by monitoring the output of the generator to the appropriate output voltage, frequency, The present invention proposes a microprocessor generator control device that protects a power generation system by controlling current and breaking a connection between a generator and a load bus when it is out of a certain reference range.

In addition, another technical problem to be achieved by the present invention is to propose a microprocessor generator control device applicable to aircraft and ground generators.

As a means for solving the above-described technical problem, the invention described in claim 1, "In the microprocessor generator control device, generator excitation by comparing the generator PMG (Permanent Magnet Generator) power (generator output voltage) with the reference voltage of the comparator A voltage adjusting unit controlling a current applied to the coil; An overvoltage and undervoltage protection unit configured to detect whether the generator output voltage is overvoltage and limit the output in the case of overvoltage and undervoltage; A current inspection unit for detecting an amount of current supplied from the generator and an amount of current detected from the aircraft and recognizing it as a problem of a connection line between the generator and the load if the difference exceeds a reference value; A high frequency and low frequency protection unit for detecting a square wave of a low voltage level applied to a microprocessor using one phase of the generator PMG power and limiting the output when the frequency is higher than the high frequency setting value or lower than the low frequency setting value; And a microprocessor for controlling the operation of each of the circuits to adjust and maintain the output of the generator.

The invention as set forth in claim 2, wherein the voltage adjusting unit divides the generator output voltage at a predetermined ratio and inputs the same to the comparator. When the generator output voltage is higher than the reference voltage in the comparator, the generator excitation coil Microprocessor generator control device, characterized in that the output voltage is adjusted by reducing the current applied to the low current and increasing the current.

The invention according to claim 3, wherein the overvoltage and undervoltage protection unit comprises: half-wave rectifying the generator output voltage through an overvoltage and undervoltage recognition circuit, and dividing the rectified voltage at a constant rate through a voltage divider circuit. Microprocessor generator control device, characterized in that the application to a microprocessor.

According to the invention of claim 4, "The current inspecting unit according to claim 1, wherein: the output of the generator and the output of the aircraft side is respectively detected as an AC value using a current transformer and then converted into a full-wave rectified DC voltage value. In addition, by using a comparator for each phase (A, B, C) of the generator and the aircraft using the converted DC voltage value, recognizes the phase (A, B, C) that the current value is different, the current of the generator three phase And summing the three-phase currents on the aircraft side and applying them to the microprocessors to convert them to digital values, and limiting the output when a difference between the two currents is greater than the reference value. to provide.

The invention as set forth in claim 5, wherein the high-frequency and low-frequency protection unit: converts one phase of the generator PMG power source into a square wave of a low voltage level using a photocouple, and converts the square wave using a logic gate. It is applied to the microprocessor after removing the noise, and the microprocessor generator control device characterized in that the output is limited if the frequency of the square wave applied to the microprocessor is higher than the high frequency setting value or lower than the low frequency setting value. .

The invention according to claim 6, wherein the operation of the microprocessor comprises: (a) initializing a system when the generator output voltage is applied and then operating the voltage adjusting unit and outputting the voltage adjusting unit. Determining whether the output voltage of the generator is higher than a reference frequency; (b) If the output voltage of the generator is less than the reference frequency in step (a), after outputting the error (ERROR) stored in the memory, the output voltage of the generator is continuously detected, the output voltage of the generator is higher than the reference frequency Initializing the system and ending the system; (c) detecting the overvoltage by operating the overvoltage protection unit when the output voltage of the generator is equal to or greater than the reference frequency in step (a), and limiting the output when the overvoltage is detected even after a predetermined time delay; (d) operating the low voltage protection unit after performing step (c) to detect whether the output voltage of the generator is lower than a reference voltage and limiting the output if a low voltage is detected even after a predetermined time delay; (e) after performing step (d), the current inspection unit is operated to detect a difference between the amount of current supplied from the generator and the amount of current detected from the aircraft, and the difference between the detected amounts of current Limiting the output when is different than the reference value; (f) operating the low frequency protection part after performing step (e) to detect whether the output frequency of the generator is lower than the reference frequency, and limiting the output if a low frequency is detected even after a predetermined time delay; (g) after the step (f), operating the high frequency protection unit to detect whether the output frequency of the generator is a higher frequency than the reference frequency, and limiting the output if the high frequency is detected even after a predetermined time delay; And (h) storing the results of the performance of the steps (c) to (g) in a memory.

According to the present invention, by allowing the continuous control of the step-by-step speed control of the generator control device using a microprocessor, the performance and convenience are improved.

In addition, the microprocessor is used to reduce the number of passive components such as switches, resistors, capacitors, inductors, and relays, greatly reducing the size and weight of the generator regulator.

In addition, when the control range is changed in the past, passive elements such as resistors are changed, but in the present invention, the desired control range and time can be easily adjusted by modifying the program.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Microprocessor Generator Controls

Figure 1 is a block diagram showing the function of the microprocessor generator control apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the microprocessor generator control device of the present invention includes a microprocessor 100, a power input unit 110, a voltage adjusting unit 120, an overvoltage protection unit 130, a low voltage protection unit 140, and a current inspection unit. 150, the low frequency protection part 160, and the high frequency protection part 170 are included.

The microprocessor 100 controls each operation of the microprocessor generator control device to adjust and maintain the output voltage of the generator. The operation of the microprocessor 100 will be described in detail later in the operation flowchart of FIG. 10.

The power input unit 110 is a circuit for inputting a generator PMG (Permanent Magnet Generator) power (generator output voltage).

The voltage adjusting unit 120 controls the current applied to the generator exciting coil generating the output voltage of the generator by comparing the generator output voltage input from the power input unit 110 with the reference voltage of the comparator (FIG. 2). And FIG. 3).

The overvoltage protection unit 130 detects whether the generator output voltage is overvoltage, and functions to limit the output in the case of overvoltage (see FIGS. 4 and 5), and the low voltage protection unit 140 of the generator output voltage It detects whether or not a low voltage and functions to limit the output when the low voltage (see Figs. 6 and 7).

The current inspection unit 150 detects the amount of current supplied from the generator and the amount of current detected at the aircraft side and if the difference is greater than or equal to the reference value, the current inspection unit 150 recognizes a problem of the connection line between the generator and the load to limit the output. (See FIG. 8).

The low frequency protection unit 160 detects a square wave of a low voltage level applied to the microprocessor using one phase of the generator PMG power and limits the output when the frequency is lower than the low frequency setting value, and the high frequency protection unit 170 A low-voltage rectangular wave applied to the microprocessor is detected by using one phase of the generator PMG power and the output is limited when the frequency is higher than the high frequency set value (see FIG. 9).

The most important function of the microprocessor generator regulator of the present invention is the voltage regulation function. The voltage adjusting unit 120 was manufactured using a semiconductor device to supply a control power to the excitation coil in order to detect the generator output voltage and control the output voltage accordingly.

The overvoltage and undervoltage protection units 130 and 140 half-wave rectify the detected generator output voltage through the overvoltage and undervoltage recognition circuit, and control the rectified voltage to the microprocessor 100 through the voltage divider circuit. The low frequency and high frequency protection units 160 and 170 remove the noise using a logic gate using a photo coupler, convert the noise into an accurate square wave, and control the microprocessor 100.

The current inspection unit 150 converts the phase (A, B, C) having a current value difference into a recognized digital value by using a comparator for each phase (A, B, C) of the generator output voltage to minimize the influence of noise, etc. And, by adding the current of the three phases of the generator to each of the microprocessor 100 was converted to a digital value and controlled.

Voltage adjuster 120

2 and 3 are circuit diagrams illustrating an example of a voltage adjusting circuit and a rectifying circuit of the voltage adjusting unit 120 shown in FIG. 1.

The control power of the excitation coil is supplied from a generator PMG (Permanent Magnet Generator). After rectification, this power is supplied to the voltage regulator control and amplifier circuits through the generator control relay.

The generator PMG power is rectified in the generator control device is used as a DC power source, one of the phase is used for the frequency check of the generator. At this time, the reference voltage (9V) of the controller is formed by using the generated rectifier power supply, and is applied to the input terminal power supply of the positive side of the comparator U2 by using half of the voltage (4.5V).

After converting the AC power, which is the generator output power, to DC power, the voltage is divided at a predetermined ratio and input to the negative terminal of the comparator U2. At this time, if the (-) stage (generator output) of the comparator is formed higher than the (+) stage (reference voltage), control is performed to reduce the current applied to the generator exciting coil, and if it is formed low, the control is increased. Do According to this operating characteristic, the output voltage of the generator is formed in proportion to the current of the excitation coil on a constant RPM basis.

Overvoltage protection unit 130

4 and 5 are circuit diagrams illustrating an example of an overvoltage recognition circuit and an overvoltage distribution circuit of the overvoltage protection unit 130 shown in FIG. 1.

The overvoltage protection unit 130 rectifies the detected generator output voltage through the overvoltage recognition circuit (FIG. 4), and the rectified voltage is sent to the microprocessor 100 through the voltage divider circuit (FIG. 5) to protect the overvoltage. It will perform the function.

For overvoltage protection, a circuit for detecting an overvoltage is configured first, and the detected voltage is converted into a digital value by the AC / DC converter in the microprocessor 100. To detect the overvoltage, convert the generator's output to a DC voltage and perform detection using a high point recognition method. At this time, the divided voltage VR6 is applied to the microprocessor 100 at a predetermined ratio.

Low voltage protection unit 140

6 and 7 are circuit diagrams illustrating an example of a low voltage detection circuit and a low voltage distribution circuit of the low voltage protection unit 140 shown in FIG. 1.

The low voltage protection unit 140 includes a circuit (FIG. 6) that detects a low voltage first for low voltage protection. At this time, the detection method rectifies the input voltage for each phase and then performs detection using a low point recognition method. Then, the detected voltage is divided by a predetermined ratio VR7 through a low voltage distribution circuit (FIG. 7) and applied to the microprocessor 100.

Current inspection unit 150

8 is a circuit diagram illustrating an example of a generator current processing circuit of the current inspecting unit 150 illustrated in FIG. 1.

The state detection protection function in the current inspection unit 150 is a problem of the connected line between the generator and the load if the difference between the amount of current supplied from the generator and the reference value (25A) for the state detection of the amount of current detected from the aircraft side This is the function to limit the output by recognizing it.

First, the sensor for detecting the current amount of the generator applies a current transformer (CT: 1/500), and detects the actual output of the generator as an AC value and converts it to a full-wave rectified DC voltage value. Current value on the aircraft side is also converted to DC voltage in the same way. The converted value is used for each phase (A, B, C) of the generator and the aircraft to recognize phases (A, B, C) with different current values. The three-phase currents of the generator and the three-phase currents of the aircraft are summed and applied to the central processing unit, respectively, and converted into digital values. At this time, if a difference larger than the reference value is implemented, a function for output protection is implemented.

Low and High Frequency Protections (160,170)

9 is a circuit diagram illustrating an example of a frequency recognition circuit of the low and high frequency protection units 160 and 170 illustrated in FIG. 1.

Frequency detection for low and high frequency protection uses generator PMG power. One phase of the PMG power is converted into a square wave of low voltage level using a photo coupler (PC7). The square wave is removed using a logic gate IC U4 to remove noise, converted to an accurate square wave, and applied to a microprocessor. At this time, if the applied frequency is higher than the high frequency setting value of the requirement, the high frequency limit function is realized, and if the frequency lower than the low frequency value is recognized, the low frequency limit function is implemented.

Operation of the Microprocessor 100

10 is a flowchart illustrating operations of each circuit function of the microprocessor generator control apparatus according to the preferred embodiment of the present invention.

A flow chart of the operation of each circuit function of the generator control device applied to the KUH (Korea Utility Helicopter) is shown in FIG. 10, and thus a microprocessor program is created.

First, when a generator output voltage is applied to the microprocessor generator control device, the system is initialized (step S10), and then the voltage adjusting unit 120 is operated, and the output voltage of the generator output by the voltage adjusting unit 120 is referred to. It is determined whether or not a voltage above the frequency is output (step S20).

If the output voltage of the generator is less than the reference frequency in step S20, after outputting the error (ERROR) state stored in the memory (steps S21 and S22), the output voltage of the generator is continuously detected, the output voltage of the generator is the reference When the frequency (for example, 370 Hz) or more (step S23) is initialized (step S24), the program is terminated.

On the other hand, if the output voltage of the generator is higher than the reference frequency (for example, 125V) in step S20 to operate the overvoltage protection unit 130 to detect the overvoltage (step S30). At this time, if an overvoltage is detected ("YES" in step S30), it is determined whether the overvoltage timer is ON (step S31), and if the overvoltage timer is OFF ("NO" in step S30), overvoltage After the timer is turned ON, the timer is delayed for a predetermined time, the process proceeds to the next step S40, and when the overvoltage timer is ON (“YES” in step S31), the timer time is checked (step S33). At this time, if the timer time is more than the reference time (for example, 5 seconds) ("YES" in step S33) is recognized as a problem of the connection line between the generator and the load to limit the output (step S80), the timer time is the reference time (For example, 5 seconds) or less (" NO " in step S33), the flow advances to the next step S40.

When the overvoltage is not detected in the overvoltage inspection step S30 (“NO” in step S30) or after performing “NO” and S32 in step S33, the low voltage protection unit 140 is operated to detect a low voltage. (Step S40). At this time, if a low voltage is detected ("YES" in step S40), it is determined whether the low voltage timer is in an ON state (step S41), and if the low voltage timer is in an OFF state ("NO" in step S40) After the timer is turned ON, the timer is delayed for a predetermined time and the process proceeds to the next step S50. When the low voltage timer is ON (“YES” in step S41), the timer time is checked (step S43). At this time, if the timer time is more than the reference time (for example, 5 seconds) ("YES" in step S43) is recognized as a problem of the connection line between the generator and the load to limit the output (step S80), the timer time is the reference time (For example, 5 seconds) or less (" NO " in step S43), the flow advances to the next step S50.

After the low voltage is not detected in the low voltage test step S40 (“NO” in step S40) or after performing the steps “NO” and S42 in S43, the current test unit 150 is operated to be supplied from the generator. The difference between the amount of the current and the amount of current detected on the aircraft side is detected (step S50). At this time, if the difference between the amount of the two detected current is more than the reference value (for example, 25A) or more difference ("YES" in step S50) recognized as a problem of the line connected between the generator and the load to limit the output (step S80), if the difference between the detected amounts of the two currents is equal to or less than the reference value (for example, 25A) (" NO " in step S50), the flow advances to the next step S60.

After the current test step S50 is performed, the low frequency protection unit 160 is operated to detect a low frequency (step S60). At this time, if a low frequency is detected ("YES" in step S60), it is determined whether the low frequency timer is ON (step S61), and if the low frequency timer is OFF ("NO" in step S60), the low frequency After the timer is turned ON, the timer is delayed for a predetermined time, and the flow advances to the next step S70. When the low frequency timer is ON (“YES” in step S61), the timer time is checked (step S63). At this time, if the timer time is more than the reference time (for example, 2 seconds) ("YES" in step S63) is recognized as a problem of the connection line between the generator and the load to limit the output (step S80), the timer time is the reference time (For example, 2 seconds) or less (" NO " in step S63), the flow advances to the next step S70.

When the low frequency is not detected in the low frequency test step S60 (“NO” in step S60) or after performing “NO” and S62 in S63, the high frequency protection unit 170 is operated to detect a high frequency. (Step S70). At this time, if a high frequency is detected ("YES" in step S70), it is recognized as a problem of a line connected between the generator and the load and the output is limited (step S80). If a high frequency is not detected ("NO" in step S70), the step ( S30) Return to the previous.

Finally, the error (ERROR) state that the output is restricted in step S80 is stored in the memory (step S90), and then the program is terminated.

As described above, the microprocessor generator control device of the present invention is used as a brushless alternator control device, and serves to adjust and maintain the output of the generator, and monitor the output of the generator to obtain an appropriate output voltage and frequency. It can protect the power generation system by controlling current, current, etc. and breaking the connection between generator and load bus when it is out of certain standard range.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention as defined by the appended claims. It will be appreciated that such modifications and variations are intended to fall within the scope of the following claims.

The microprocessor generator control device of the present invention is applicable to aircraft and ground generators.

Figure 1 is a block diagram showing the function of the microprocessor generator control apparatus according to a preferred embodiment of the present invention

2 and 3 are circuit diagrams showing an example of a voltage adjusting circuit and a rectifying circuit of the voltage adjusting unit shown in FIG.

4 and 5 are circuit diagrams illustrating an example of an overvoltage recognition circuit and an overvoltage distribution circuit of the overvoltage protection unit of FIG. 1.

6 and 7 are circuit diagrams showing an example of a low voltage detection circuit and a low voltage distribution circuit of the low voltage protection unit shown in FIG.

8 is a circuit diagram illustrating an example of a generator current processing circuit of the current inspecting unit illustrated in FIG. 1.

9 is a circuit diagram illustrating an example of a frequency recognition circuit of a high frequency and low frequency protection unit illustrated in FIG. 1.

10 is a flowchart illustrating operations of each circuit function of the microprocessor generator control device according to the preferred embodiment of the present invention.

[Description of Code for Major Parts of Drawing]

100: microprocessor 110: power input unit

120: voltage adjusting unit 130: overvoltage protection unit

140: low voltage protection unit 150: current inspection unit

160: low frequency protection unit 170: high frequency protection unit

Claims (6)

In a microprocessor generator regulator, A voltage adjusting unit controlling a current applied to the generator exciting coil by comparing the generator PMG power (generator output voltage) with a reference voltage of the comparator; An overvoltage and undervoltage protection unit configured to detect whether the generator output voltage is overvoltage and limit the output in the case of overvoltage and undervoltage; A current inspecting unit configured to limit the output by recognizing a problem in the connection line between the generator and the load when the amount of current supplied from the generator and the amount of current detected by the aircraft differ by more than a reference value; One phase of the generator PMG power is converted into a square wave of low voltage level using a photocoupler, and the square wave is applied to a microprocessor after removing noise using a logic gate, and the frequency of the square wave applied to the microprocessor is high frequency. A high frequency and low frequency protection unit configured to limit the output when the frequency is higher than the set value or lower than the set frequency; And A microprocessor that controls and maintains an output of a generator by controlling operations of the voltage adjusting unit, overvoltage and low voltage protection unit, current inspection unit, high frequency and low frequency protection unit; Microprocessor generator control device comprising a. delete delete The method of claim 1, wherein the current inspection unit: The output of the generator and the output of the aircraft are respectively detected as an AC value using a current transformer and then converted into full-wave rectified DC voltage values, and the converted DC voltage values are converted into phases (A, B) of the generator and the aircraft. Recognize phases (A, B, C) with different current values by using comparators for each, and add the current of the three phases of the generator and the three-phase current of the aircraft and apply them to the microprocessor to obtain digital values. And limiting the output if a difference between the two currents is greater than the reference value. delete The method of claim 1, wherein the microprocessor operates: (a) initializing a system when the generator output voltage is applied, and then operating the voltage adjusting unit, and determining whether the output voltage of the generator output by the voltage adjusting unit is higher than a reference frequency; (b) If the output voltage of the generator is less than the reference frequency in step (a), after outputting the error (ERROR) stored in the memory, the output voltage of the generator is continuously detected, the output voltage of the generator is higher than the reference frequency Initializing the system and ending the system; (c) detecting the overvoltage by operating the overvoltage protection unit when the output voltage of the generator is equal to or greater than the reference frequency in step (a), and limiting the output when the overvoltage is detected even after a predetermined time delay; (d) operating the low voltage protection unit after performing step (c) to detect whether the output voltage of the generator is lower than a reference voltage and limiting the output if a low voltage is detected even after a predetermined time delay; (e) after performing step (d), the current inspection unit is operated to detect a difference between the amount of current supplied from the generator and the amount of current detected from the aircraft, and the difference between the detected amounts of current Limiting the output when is different than the reference value; (f) operating the low frequency protection part after performing step (e) to detect whether the output frequency of the generator is lower than the reference frequency, and limiting the output if a low frequency is detected even after a predetermined time delay; (g) after the step (f), operating the high frequency protection unit to detect whether the output frequency of the generator is a higher frequency than the reference frequency, and limiting the output if the high frequency is detected even after a predetermined time delay; And (h) storing the result of performing steps (c) to (g) in a memory; Microprocessor generator control device comprising a.

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