KR20010037717A - An inverter with signal generating ability for driving of motor - Google Patents

Abstract

PURPOSE: A signal generating inverter device for driving a motor is provided to improve the program processing speed of a microcomputer by separately installing a signal generating section which processes a three phase sinusoidal wave signal for driving a motor. CONSTITUTION: A voltage rectifying section(10) rectifies an AC power. A smoothing section(20) smoothes the rectified voltage and transfers the smoothed voltage to a system. A switching section(30) is connected to the smoothing section(20). The switching section(30) comprises a plurality of transistors to transfer a three phase sinusoidal wave signal to a motor(M). A hall sensor section(40) detects the present position in the motor(M), and generates a position detecting signal. A microcomputer(50) extracts the position information of a rotor through the position detecting signal transferred through the hall sensor(40). The microcomputer(50) sets the magnitude of the sinusoidal signal, and transfers the position information of the rotor and the magnitude information of the sinusoidal signal. A signal generating section(60) generates signal data about the three phase sinusoidal wave signal. A driving section(70) generates a switching driving signal, and transfers the switching driving signal to the switching section(30) to drive transistors.

Description

An inverter with signal generating ability for driving of motor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving signal generating inverter device for providing a constant voltage to a motor installed in a home appliance such as a washing machine, a refrigerator, or an air conditioner. In particular, the present invention calculates a sine wave current applied to a winding of a motor. Parallel processing in hardware allows the microcomputer to continuously perform the next operation when calculating the sine wave current, improving the performance of the microcomputer's work, reducing programming time and preventing program runaway. A signal generating inverter device.

In general, an inverter device is a device that converts commercial AC power into a DC voltage and converts it into a desired frequency or voltage and applies it to a motor. The device can change the speed of the motor to perform performance improvement or energy saving of home appliances. to be.

The inverter device according to the prior art is shown in FIG. 1. Referring to this, a voltage rectifying unit 1 for rectifying 220 V, 60 kW AC power transmitted from the outside through a bridge diode (not shown), and the voltage rectifying unit The voltage rectified in (1) is smoothed through the capacitor (C) and the coil (L) to generate a DC voltage and a voltage smoothing unit (2), and the plurality of transistors connected to the voltage smoothing unit (2) and simultaneously. And a switching unit 3 for transmitting a motor driving current to the winding of the motor M, and a microcomputer 4 for determining a voltage and frequency necessary for driving the motor M and generating and outputting a switching control signal accordingly. And a driving unit 5 receiving the switching control signal of the microcomputer 4 to generate and output a switching driving signal for driving the switching unit 3.

In particular, the switching unit 3 receives the switching driving signal of the driving unit 5 to generate power supplied to three phases (U phase, V phase, W phase) of the motor M. In addition, the system is provided with various protection circuits to prevent breakage of each transistor of the switching section 3, but is omitted in FIG.

The operation of the inverter device according to the related art, which is configured as described above, is first converted into a DC voltage through the voltage rectifying unit 1 and the voltage smoothing unit 2 when AC power is applied from the outside, and is supplied to the system. Subsequently, the microcomputer 4 generates a sinusoidal signal having a constant frequency and voltage to drive the motor M. FIG. 2 illustrates the operation of the sinusoidal signal of the microcomputer 4 in detail.

As shown in FIG. 2, in the first step, the position of the rotor according to the rotation of the motor M is detected by the microcomputer 4 to generate and output a position detection signal (see S1). In step S1, the position detection signal received from the first step S1 determines whether the rotor is located at a specific position in the motor M (see S2).

If the determination result of the second step S2 is no, the process returns to the first step S1, but if the determination result of the second step S2 is YES, the motor After calculating the number of revolutions (M), the zero point of the sine wave signal is detected (see S3).

Next, in the fourth step, since the peak current must be increased at the zero point of the sinusoidal signal detected in the third step S3 to generate a steady state sinusoidal signal to drive the motor M, the timer operates. At the same time, the carrier frequency is set to 20 kHz, and a pulse width modulation (PWM) method is used every 50 kHz (see S4).

That is, after determining the magnitude of the pulse every 50㎲, increase and decrease the pulse size appropriately, transfer it to the motor M through the driving unit 5 and the switching unit 3, and then measure the current of the motor M again. It becomes a sine wave signal.

In the fifth step, a timer is used to monitor whether an interrupt signal is generated every 50 ms. (See S5.) In this case, if the monitoring result of the fifth step S5 is no, the sixth step is performed. A sine wave signal such as a pulse magnitude is calculated, and in the seventh step, an ON period and an OFF period are determined through the sine wave signal calculated in the sixth step S6 (see S6 and S7). )

However, when the monitoring result of the fifth step (S5) is 'Yes' in the eighth step through the output port of the microcomputer 4, the high signal in the on-section, low in the off period (Low) ) Outputs a signal. In addition, in the seventh step S7, after the on period and the off period are determined, the process proceeds to the eighth step S8 to output an appropriate signal.

Finally, in the ninth step, it is determined whether the motor M should be stopped. If the determination result of the ninth step S9 is YES, the calculation process of the sine wave signal of the microcomputer 4 is terminated. After the next operation is performed, if the determination result of the ninth step (S9) is no, the process returns to the first step (S1) to perform the operation of the sine wave signal again (see S9).

As such, when a switching driving signal is generated through the operation of the sine wave signal of the microcomputer 4 and output to the driving unit 5, the driving unit 5 switches the driving unit to drive each transistor of the switching unit 3. The switching signal is transmitted to (3). Then, the switching unit 3 transmits a sine wave current to the winding of the motor M by the switching signal.

However, in the conventional case, the microcomputer 4 stops other operations to calculate the sine wave signal during processing and performs the calculation process of the sine wave signal as shown in FIG. At this time, the microcomputer 4 consumes 60% of the total execution time to calculate the sine wave signal, and performs other operations such as display, input signal processing of the sensor, and key input processing at the remaining 40% of the execution time. In other words, this is called inverter drive load ratio, and even the fastest microcomputer now has a drive load ratio of more than 70%.

As described above, the three-phase sine wave driving of the inverter by the software of the microcomputer 4 has a problem in that other tasks cannot be properly performed because most of the program execution time of the software is used for calculation of the sine wave signal.

In addition, in order to increase the program execution speed, the oscillation clock must be used very quickly. However, the microcomputer 4 has a problem that only a low switching frequency of about 5 kHz and 200 kHz cycles can be used.

The present invention has been made to solve the above problems of the prior art, the object of the microcomputer by installing a separate signal generator for generating a three-phase sine wave signal in parallel to the hardware to drive the motor in the inverter device The present invention provides a motor driving signal generating inverter device that not only significantly improves the program execution speed but also shortens the programming time and prevents program runaway in advance.

1 is a block diagram showing the configuration of an inverter device according to the prior art;

FIG. 2 is a flowchart illustrating a process of calculating a sine wave signal of a microcomputer, which is a part of FIG. 1;

3 is a block diagram showing the configuration of the signal generation inverter device for driving a motor according to the present invention;

4 is a block diagram illustrating a signal generator that is a part of FIG. 3;

<Explanation of code about main part of drawing>

10: voltage rectifying part 20: smoothing part

30: switching unit 40: Hall sensor unit

50: microcomputer 60: signal generator

61: interface unit 62, 63: first and second register

64: data table 65: multiplier

66: sine wave distribution unit 70: drive unit

According to a first aspect of the motor driving signal generating inverter device according to the present invention for solving the above problems, a voltage converter for rectifying and smoothing the AC power from the outside to convert the output into a DC voltage; A position detector for detecting a current position of the motor and generating the same as a position detection signal; A microcomputer that receives the position detection signal, extracts current position information of the rotor, generates information on a signal magnitude required to drive the motor at a desired rotational speed, and transmits each information to the system; A signal generator for receiving and receiving each information of the microcomputer to generate and output signal data for a motor driving signal having a predetermined size and frequency; And a switching unit configured to receive the signal data of the signal generator and perform a switching operation to transfer a signal current for driving the motor to the winding of the motor.

On the other hand, according to an additional feature of the present invention, the signal generator is a data table for storing the data for the motor drive signal to generate the first signal data at a predetermined data interval and outputs; Data for taking the data of the data table according to the position information of the first register for generating and outputting the second signal data according to the size information of the motor driving signal received through the interface from the micom, and the rotor received from the micom A second register at which an interval is determined and at which a current data address value and a next data address value are calculated; A multiplier for generating and outputting third signal data by multiplying the first and second signal data; And a signal distribution unit configured to receive the third signal data of the multiplier and generate and output the driving data converted into the pulse data having a predetermined duty.

According to another additional feature of the present invention, the signal generator includes a switching driver for receiving the driving data of the signal distribution unit to generate and output the switching driving signal for controlling the driving of the switching unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 3 is a block diagram showing a configuration of a signal generator for driving a motor according to the present invention, and FIG. 4 is a block diagram showing a signal generator which is a part of FIG.

Next, referring to FIGS. 3 and 4, the present invention provides a voltage rectifying unit 10 and a smoothing unit 20 which convert and convert a DC voltage into a DC voltage when the commercial AC power is transmitted from the outside to the system; A switching unit (30) connected to the smoothing unit (20) to perform a switching operation made up of a plurality of transistors to transfer a three-phase sine wave signal to a motor (M); A hall sensor unit 40 for detecting a current position in the motor M and generating and outputting a position detection signal due to the detection result;

Extract the position information of the rotor through the position detection signal received through the Hall sensor unit 40, and set the size of the sine wave signal to drive the motor (M) at a desired rotational speed and the position information of the rotor A microcomputer 50 for transmitting the magnitude information of the sine wave signal to the system;

A signal generator 60 which receives each information of the microcomputer 50 and generates and outputs signal data for a three-phase sine wave signal having a frequency and a signal magnitude according thereto; And a driving unit 70 for generating a switching driving signal according to the signal data of the three-phase sine wave signal received through the signal generator 60 and transferring the same to the switching unit 30 to drive each transistor. do.

In particular, the signal generator 60 is an interface unit 61 for transmitting the information transmitted from the microcomputer 50 into the signal generator 60 when the rotor reaches a specific position as shown in FIG. ; A first register 62 for generating and outputting 8-bit first signal data corresponding to a signal size when the size information of the sine wave signal and the position information of the rotor are respectively transmitted by the interface unit 61; A second register 63 for determining a data interval such that a frequency of the signal is determined and calculating a current data address value and a next data address value;

A data table 64 having data for a three-phase sine wave signal is already stored and generating and outputting 8-bit second signal data according to the data interval taken by the second register 63 so that the frequency of the signal can be determined; ; A multiplier (65) which multiplies the second signal data output from the data table (64) by the first signal data of the first register (62) and delivers 16 bits of third signal data as a result of the multiplication to the system; The third signal data is received through the multiplier 65 and converted into a PWM waveform to generate a driving data, and the sinusoidal distribution unit 66 transmits the driving data to the driving unit 70.

On the other hand, the data table 64 is one sine wave data table which does not vary depending on the driving frequency, and there are only 0-90 ° tables among 360 ° tables. You can compute the table.

In addition, the signal generator 60 may be installed inside or outside of the microcomputer 50. In the present invention, the signal generator 60 is installed outside the microcomputer 50 so that the signal generator 60 And micom 50 is clipped into one, so that it is operated as asynchronous (ASK) microcomputer as a whole.

According to the operation of the present invention configured as described above, the hall sensor unit 40 detects the current position of the motor M, generates a position detection signal, and transmits the position detection signal to the microcomputer 50. Then, the microcomputer 50 checks the position of the rotor in the motor M, checks the zero point of the sine wave signal, and measures the magnitude of the sine wave signal applied to the motor M to drive the motor M at a desired rotational speed. By determining the position information of each rotor and the size information of the signal is transmitted to the signal generator 60 through the interface unit 61.

The signal generator 60 stores the size information of each signal and the position information of the rotor in the first and second registers 62 and 63 via the interface unit 61. In this case, the first register 62 generates the first signal data according to the signal size information, and the second register 63 generates the first signal data at a driving frequency (for example, 10 Hz / 40 Hz driving) of the motor. Accordingly, the data is taken from the data table 64 at regular data intervals, and the current address value and the next data address value to be taken are calculated.

In the data table 64, a sine wave signal having a constant frequency is determined according to the data interval of the second register 63 to generate and output second signal data. Meanwhile, the multiplier 65 multiplies the first and second signal data output from the first register 62 and the data table 64 and transmits the multiplied signal to the sine wave distributor 66 in the form of a third signal data.

Then, the sinusoidal distribution unit 66 calculates how much duty each pulse of the six transistors in the switching unit 30 gives, and converts the third signal data into a PWM waveform to drive the driver 70. Is applied in the form of driving data.

The driving unit 70 generates and outputs a switching driving signal according to the driving data to drive each transistor of the switching unit 30, and the switching unit 30 is provided at the voltage rectifying unit 10 and the smoothing unit 20. The current transmitted in the direct current form can be applied to the winding (U phase, V phase, W phase) of the motor M as a sinusoidal current.

The switching driving signal is generated as an interrupt signal at a cycle of 50 ms (= 500). When the 16-bit third signal data output through the multiplier 65 is 250, 25 ON turns (Turn ON), When the third signal data is 450, the third signal data has a turn-off interval of 45 ms and a turn-off interval of 5 ms.

On the other hand, the position of the rotor detected by the Hall sensor unit 40 can be driven by 40 서 / 10 ㎐ by grasping and changing the position of the rotor as the zero point data of the sine wave, especially during 40 특히 operation The position detection signal of the hall sensor unit 40 frequently appears to compensate for the zero point each time.

The motor drive signal generation inverter device of the present invention configured as described above provides a program execution speed of the microcomputer by separately installing a signal generation unit for generating parallel operation processing of a three-phase sine wave signal for driving a motor in the inverter device. In addition to significantly improving the programming time and development period, it is possible to prevent congestion of the program in advance, and above all, the performance and performance of the microcomputer can be improved.

Claims (3)

A voltage converter configured to receive AC power from the outside and rectify and smooth the converted AC voltage to output a DC voltage; A position detector for detecting a current position of the motor and generating the same as a position detection signal; A microcomputer that receives the position detection signal, extracts current position information of the rotor, generates information on a signal magnitude required to drive the motor at a desired rotational speed, and transmits each information to the system; A signal generator for receiving and receiving each information of the microcomputer to generate and output signal data for a motor driving signal having a predetermined size and frequency; And a switching unit configured to receive the signal data of the signal generator and perform a switching operation to transfer the signal current for driving the motor to the winding of the motor accordingly. The method of claim 1, The signal generator is a data table for storing the data for the motor driving signal to generate and output the first signal data at a predetermined data interval; Data for taking the data of the data table according to the position information of the first register for generating and outputting the second signal data according to the size information of the motor driving signal received through the interface from the micom, and the rotor received from the micom A second register at which an interval is determined and at which a current data address value and a next data address value are calculated; A multiplier for generating and outputting third signal data by multiplying the first and second signal data; And a signal distributor configured to receive the third signal data of the multiplier and generate the same as driving data converted into a pulse waveform having a predetermined duty. The method according to claim 1 or 2, And the signal generator includes a switching driver configured to receive driving data of the signal distributor and generate the same as a switching driving signal capable of controlling driving of the switching unit.