KR20030050021A - System operating motor of power separation type - Google Patents

Abstract

PURPOSE: A motor driving system is provided to prevent an offset or noise due to a high voltage by disposing an optical coupler between a control power part and a motor driver part so as to form an independent ground. CONSTITUTION: A motor driver part(20) controls a motor drive operation, and a control power part(10) applies a control power to the motor driver part. The first and second optical couplers(31,32) are disposed between the control power part(10) and the motor driver part(20) and separate a common ground. The first and second buffer parts(38a,38b) are connected to the first and second optical couplers(31,32) so as to buffer a power signal. A converter part(37) converts a voltage of the control power part(10).

Description

Power separate motor drive system {SYSTEM OPERATING MOTOR OF POWER SEPARATION TYPE}

The present invention relates to a motor drive system, and more particularly, to a power separation type motor drive system in which a ground is separated by using an optical coupler for a control power supply unit and a motor driver unit to prevent malfunction due to noise and disturbance.

1 is a view showing the configuration of a motor drive system according to the prior art.

As shown in FIG. 1, a system including a motor driver 20 for controlling motor driving and a control power supply 10 for applying control power to the motor driver 20 includes the motor driver 20. And ground of the control power supply unit 10 are common.

The voltage used to drive the motor in the motor driver 20 has a range of several hundred volts (V) according to the size of the motor, and is connected in series with the motor driver 20 to control a control signal for controlling the motor. The voltage used in the control power supply unit 10 to be applied is from several volts to several tens of volts. In this way, different voltages are used, but ground terminals are commonly used.

In general, a square wave having a range of 0 to 15 V is used in the control power supply unit 10, and the rotation direction and state are controlled in the motor driver unit 20 while applying a rotational force to the motor using a square wave of 200 V or more. .

However, in the motor driving system as described above, since the control power supply and the motor driver are directly connected in series, and the reference ground is also the same, an offset or noise is generated in the control power supply when voltage is applied to the motor driver using a high voltage for motor rotation. There is a problem causing malfunction.

The present invention has been made to solve the above-mentioned problems of the prior art, by placing an optocoupler between the control power supply unit to handle a low voltage and the motor driver unit to handle a high voltage to form a ground independent from each other to offset by a high voltage or It is an object of the present invention to provide a power separation type motor driving system which prevents noise.

1 is a view showing the configuration of a motor drive system according to the prior art.

Figure 2 is a diagram showing the configuration of a separate power supply type motor drive system according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: control power supply unit 20: motor driver unit

31: first optocoupler 32: second optocoupler

33a, 33b: resistors 35a, 35b: inverter

38a, 38b: buffer part 37: converter part

In order to achieve the above object, the separate power source motor drive system according to the present invention,

A control power supply for controlling the motor;

A motor driver unit controlling the motor by the power supplied from the control power unit; And

And first and second optocouplers arranged to separate the power ground of the control power supply unit from the power ground of the motor driver unit.

Here, a converter unit for supplying power to the first and second optocoupler, characterized in that the buffer unit consisting of a resistor and an inverter are respectively disposed at the output terminal of the first and second optocoupler.

According to the present invention, the common ground is separated between the control power supply unit and the motor driver unit by using the optocoupler and the buffer unit, thereby preventing malfunctions caused by offset voltage and noise.

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

2 is a diagram illustrating a configuration of a power separate type motor driving system according to the present invention.

As shown in FIG. 2, a motor driver 20 for controlling motor driving, a control power supply 10 for applying control power to the motor driver 20, the control power supply 10, and a motor driver A first optocoupler 31 and a second optocoupler 32 disposed between the first and second optocouplers 32 and 32 which are disposed between the first and second optocouplers 31 and 32, respectively; The first and second buffer units 38a and 38b serve as a function, and the converter unit 37 converts the voltage of the control power supply unit 10.

The control signal generated by the control power supply unit 10 is transmitted to the motor driver unit 20 through the first optical coupler 31 and the second optical coupler 32, wherein + of the control power supply unit 10 The voltage of 15V to 0 is converted to + 15V to 0V based on the new ground in the cone 37 to operate the first and second optocouplers 31 and 32.

Here, the optical coupler (31, 32) in the optical subscriber network, such as cable TV or fiber in the loop (FITL), to distribute the optical signal from one place to several places or vice versa It is an electronic device that serves to aggregate. In addition, the optocoupler is classified into a star optocoupler, a directional optocoupler, a branched optocoupler, etc. according to the configuration of the optical communication network.

Accordingly, the signals generated from the control power supply unit 10 are transmitted to the motor driver unit 20 through the first and second optocouplers 31 and 32, respectively, wherein the optocouplers 31 and 32 are transferred. As it passes, the signals are converted into signals with completely different ground references. As such, the signals passing through the optocouplers 31 and 32 pass through the first and second buffer portions 38a and 38b including the resistors 33a and 33b and the inverters 35a and 35b to remove noise. It is transmitted to the motor driver 20.

As described in detail above, the present invention completely separates the reference grounds of the control power supply unit and the motor driver unit by using the optocoupler, thereby preventing offset and noise generated in the low voltage driving power supply by the high voltage driving power supply.

In addition, it is possible to prolong the operation time of the motor and the protection of the motor by the overcurrent that may be generated due to the distortion of the control signal input to the motor driver.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (3)

A control power supply for controlling the motor; A motor driver unit controlling the motor by the power supplied from the control power unit; And a first and a second optocoupler arranged to separate the power ground of the control power supply and the power ground of the motor driver. The method of claim 1, And a converter unit for supplying power to the first and second optocouplers. The method of claim 1, Power separation type motor drive system, characterized in that the buffer portion consisting of a resistor and an inverter are respectively disposed at the output end of the first and second optocoupler.