KR100289745B1 - Electromotive transport machine driven control system using micro processor - Google Patents

Abstract

PURPOSE: An electromotive transport machine driven control system using a micro processor is provided, which achieves a stabilization of an electromotive transport machine and a user by informing every kinds of operation states and fail states to the user through a LED display, and prolongs a lifetime of the electromotive transport machine by improving an efficiency. CONSTITUTION: A DC electric motor(15) rotates to move an electromotive transport machine, and a switching waveform generation apparatus part(12) generates a PWM switching waveform by receiving a control signal. An FET chopper circuit(14) rotates the DC electric motor by generating a driving power by switching the PWM switching waveform from the switching waveform generation apparatus part. A state feedback part(13) senses a variation of a current generated from the FET chopper circuit. A central control part(11) generates a control signal to generate the PWM switching waveform in the switching waveform generation apparatus part and receives the variation amount of the current from the state feedback part and generates an error signal of the DC electric motor when the variation of the current is larger than a set value. And a self fault diagnosis apparatus and display part.

Description

Electric Transport Machine Propulsion Control System Using Micro Processor

The present invention relates to an electric vehicle propulsion control system using a microprocessor, and in particular, a stable propulsion control system of a conveying machine through a DC motor speed control using a microprocessor and a chopper circuit and an LED using an FET to improve efficiency. An operation state display device and a self-failure diagnosis system.

In general, from the industrial revolution to the present day, all industries have been developed from the manual industry to the mass production system. Therefore, diesel and gasoline engine using Transport machinery has been developed and used. However, it is not suitable for use in factories because it is accompanied by soot.

In order to compensate for this, the interest in electric transport machines using electric power has increased to this day. However, these electric transport machines are designed to be operated by the driver to carry or walk or walk, so that the driver's mistake or Stable speed control and self-factory diagnostic system are needed because it can cause a big accident in case of malfunction.

In addition, the speed control in the conventional DC electric vehicle propulsion control system as shown in Figure 1 attached to the resistor in series with the motor to change the value of the resistance to generate and control the speed of the motor Problems have occurred such as a decrease in battery efficiency and limitations in speed control of the motor.

It is an object of the present invention to realize a stable propulsion control system of an electric transport machine by controlling the speed of a direct current motor by using a microprocessor and a FET, and to inform the user of various operating states and failure states through an LED indicator. And to provide an electric transport machine propulsion control system using a microprocessor to ensure the stability of the user.

Another object of the present invention is to improve the efficiency of use of the chopper circuit using the FET to extend the service life of the electric transport machine because it needs to be used for a long time without recharging because the power is supplied from the battery of the electric transport machine. .

1 is a diagram illustrating the configuration of a conventional electric vehicle propulsion control system.

2 is a block diagram of the electric propulsion machine propulsion control system according to the present invention.

3 is a detailed circuit diagram of the central control unit shown in FIG.

4 is a detailed circuit diagram of the switching waveform generator unit shown in FIG.

5 is a detailed circuit diagram of the FET chopper circuit shown in FIG.

An electric transport machine propulsion control system using a microprocessor of the present invention includes a direct current electric motor rotating to move the electric transport machine; A switching waveform generator for receiving a control signal and generating and outputting a PWM switching waveform; A FET chopper circuit for receiving and switching a PWM switching waveform output from the switching waveform generator unit to rotate a DC motor; A state feedback unit for detecting and outputting an amount of change in current generated in the FET chopper circuit due to a change in speed generated when the DC motor rotates by a switching operation of the FET chopper circuit; The switching waveform generator generates a control signal for generating a PWM switching waveform, receives a change amount of current output from the state feedback unit, and generates and outputs an abnormal signal of a DC motor when the change amount of the current is greater than a preset change amount. A central controller; And a self-failure diagnosis device and a display unit which display an abnormality of the DC motor when the abnormal signal of the DC motor is output and received from the central controller.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of the electric propulsion machine propulsion control system according to the present invention, and FIG. 3 is a detailed circuit diagram of the electric propulsion machine propulsion control system shown in FIG. As shown, a DC motor 15 that rotates to move the electric transport machine, a switching waveform generator unit 12 for receiving a control signal and generating and outputting a PWM switching waveform, and a switching waveform generator unit ( 12 of the FET chopper circuit 14 for receiving and switching the PWM switching waveform output from 12) to generate a driving power source to rotate the DC motor 15, and the DC motor 15 rotated by the FET chopper circuit 14. In order to generate a PWM switching waveform in the state feedback unit 13 and the switching waveform generator 12 which detect and output an amount of change in the current generated by the FET chopper circuit 14 by a change in speed generated during rotation. Generating and outputting an abnormal signal of the DC motor when generating a control signal and receiving a change amount of the current output from the state feedback unit 13 and the change amount of the current is greater than a preset change amount. The controller 11 and the magnetic failure diagnosis device for displaying the abnormality of the DC motor 15 and the display unit (not shown) when the abnormal signal of the DC motor 15 is output from the central control unit 11 is received. It is done.

Referring to the configuration and operation of the present invention in more detail as follows.

As shown in FIG. 2, the central controller 11 controls the rotation of the DC motor 15 as a whole. The DC motor 15 rotates to move the electric transport machine, and the DC motor 15 is a drive generated in the FET chopper circuit 14 which is switched by the PWM switching waveform output from the switching waveform generator unit 12. Rotated by the power supply. The FET chopper circuit 14 receives the PWM switching waveform output from the switching waveform generator 12 and receives the power supplied from the battery 16 to switch to generate driving power.

The driving power generated by the FET chopper circuit 14 is transmitted to the DC motor 15, and the DC motor 15 is rotated by receiving the transmitted driving power. When the DC motor 15 rotates, the electric transport machine is moved by the rotational force generated by the DC motor 15. An abnormality may occur in the DC motor 15 during the movement of the electric transport machine. For example, a case where the rotational speed of the DC motor 15 changes rapidly may occur.

When the DC motor 15 suddenly changes the rotational speed, the electric transport machine may be rapidly accelerated, and thus detected by the state feedback unit 13 to recognize the driver in advance. In the state feedback unit 13, when the rotational speed changes rapidly during the rotation of the DC motor 15, the driving power generated by the FET chopper circuit 14 changes rapidly. In this case, since the driving power current is used, the amount of current is changed by a sudden change in the rotational speed of the DC motor 15.

The change amount of the current amount is sensed by the state feedback unit 13 and transmitted to the central control unit 11. When the central control unit 11 receives the change amount of the current amount from the state feedback unit 13, the central controller 11 compares whether the change amount of the current is greater than the preset change amount. As a result of the comparison, when the amount of change in current is large, the central control unit 11 generates an abnormal signal. The abnormal signal generated by the central control unit 11 is received by the magnetic failure diagnosis apparatus and the display unit (not shown).

The self-failure diagnosis device and the display unit display the driver that an abnormality has occurred in the DC motor 15 on the display screen composed of an LED array (not shown) so as to take an action in advance.

A detailed embodiment of the present invention incorporating the above technical concept is implemented as shown in FIGS. 3 to 5.

3 is a detailed circuit diagram of the central control unit 11 so that the microprocessor U110 and the microprocessor U110 can communicate with the state feedback unit 13 or the switching waveform generator 12. Address decoders U130A and U130B for specifying the address of the switching waveform generator 12 and a digital input IC IC U120 for transmitting and receiving signals generated by the state feedback unit 14 or the switching waveform generator 13 are included. It is.

Signals transmitted and received to the microprocessor U110 through the digital input unit IC U120 include a rotation direction of the DC motor 15, an emergency signal, and a brake release signal. The signal for enabling the conversion of the set value of the control program built in the microprocessor (U110), the main power supply signal of the DC motor, the detection signal of the deceleration rotation of the rotor (not shown) of the DC motor 15, etc. Detects the induced current polarity of the rotor generated when the rotational direction of the motor 15 is suddenly changed, and the microprocessor U110 operates the PWM switching frequency from 15KHz to 2KHz to flexibly change the rotation of the DC motor. Signal (PLUG_DT).

4 is a circuit diagram illustrating the switching waveform generator unit 12 in detail. The switching waveform generator 12 generates a clock signal generator circuit U220, a circuit for generating a basic clock of a PWM switching frequency, and a PWM waveform. It consists of the circuit U210. The switching waveform generator 12 comprising a clock signal generating circuit U220, a circuit for generating a basic clock of a PWM switching frequency, and a circuit for generating a PWM waveform U210 generates a PWM waveform. It generates a sawtooth waveform by counting the binary counter and receives the control signal which is the speed command value of the user calculated by the microprocessor (U110) to generate and output the PWM switching pulse.

FIG. 5 is a circuit diagram of a FET chopper, and the average output voltage applied to the DC motor 15 is shaped through the ICs U310, U320, and U330 according to the switching operation time by the switching time of the FET (not shown). 15) determine the speed. As described above, the FET switching operation is called chopping, and a high speed switching diode (not shown) is connected in parallel between the battery 16 and the chopper circuit 14 to minimize switching loss and switching noise in the present invention. To minimize switching noise.

As described above, when the speed is rapidly changed in the DC motor, the microprocessor detects the displayed speed on the display and the driver can consider the safe driving of the electric transport machine in advance, thereby enabling the electric transport machine to be used safely.

As described above, the electric transport machine propulsion control system using the microprocessor of the present invention checks the variation in the speed of the DC motor and displays the abnormality in the rotational speed of the DC motor by checking the abnormality in the self-diagnosis function and the display unit. By detecting, it provides the effect of safe operation of the electric transport machine.

Claims (1)

An apparatus for controlling an electric conveying machine, comprising: a direct current electric motor rotating to move the electric conveying machine; A switching waveform generator unit for receiving a control signal and generating and outputting a driving power having a PWM switching waveform; A FET chopper circuit for receiving and switching a PWM switching waveform output from the switching waveform generator unit to generate a driving power to rotate the DC motor; A state feedback unit for detecting and outputting an amount of change in current generated in the FET chopper circuit due to a change in speed generated when the DC motor rotated by the switching operation of the FET chopper circuit; The control unit generates a control signal for generating a PWM switching waveform in the switching waveform generator unit, receives a change amount of the current output from the state feedback unit, and generates an abnormal signal of a DC motor when the change amount of the current is greater than a preset change amount. Central control unit for outputting; And a magnetic failure diagnosis device for displaying an abnormality of the DC motor and a display unit when an abnormal signal of the DC motor is output and received from the central controller.

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