KR101039452B1 - Method and apparatus for controlling a motor of inverter washing machine - Google Patents

Abstract

According to the present invention, when the braking resistor is to be disconnected during reverse braking operation, it is possible to switch to power generation braking which does not cause a voltage rise of the DC link terminal. It is composed of a motor for supplying rotational force to a pulsator, and an inverter including a plurality of insulating gate bipolar transistors (IGBTs), and an IPM driver for supplying three-phase (U / V / W) power to the motor. In one inverter washer, the motor may generate a braking resistor (BR) for consuming a generated voltage as heat, a transistor (Q1) for driving the braking resistor (BR), and an output terminal voltage of the transistor (Q1). A first detector for detecting, a second detector for detecting a voltage at the DC link terminal output from the rectifier, and a corresponding control signal according to a user request command, And a microcomputer for selectively controlling reverse phase braking and power generation braking according to the voltage difference detected by the first and second detection units, and detecting reverse phase braking (rapid braking) when the braking resistor is to be disconnected. By stopping and switching to power generation braking, the voltage rise of DC link stage does not occur, thereby preventing damages of IPM driver and power supply device, and minimizing service cost by replacing only braking resistor during service. It has an effect.

Inverter Washer / Reverse Braking / Generation Braking / Brake Resistance

Description

Method and apparatus for controlling (a) motor of inverter washing machine

1 is a circuit diagram showing a motor control apparatus of an inverter washing machine according to the prior art

Figure 2 is a circuit diagram showing a motor control device of the inverter washing machine according to the present invention

3 is a flow chart showing a motor control method of the inverter washing machine according to the present invention.

Explanation of symbols for main parts of the drawings

11 rectifier 12 motor

13: IPM driver 101: first detection unit

102: second detection unit 103: microcomputer

The present invention relates to a washing machine, and more particularly, to a motor control apparatus and method of an inverter washing machine.

In general, a washing machine is a device that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade and the impact of the pulsator on the laundry. By detecting the amount and type of laundry, the washing method is automatically set, and the level of the washing water is supplied to the appropriate level according to the amount and type of laundry, and then washing is performed under the control of the microcomputer.

In addition, the driving method of the conventional fully automatic washing machine is a method of rotating the pulsator or the dehydration tank by transmitting the rotational power of the drive motor to the washing shaft through the power transmission belt and pulley, or to the dehydration shaft, and BLDC motor ( There is a method of rotating the washing tank and dehydration tank at different speeds when washing and dehydrating by speed control of Brushless DC Motor.

Hereinafter, a braking circuit of an inverter washing machine according to the related art will be described with reference to the accompanying drawings.

1 is a circuit diagram showing a motor control apparatus of an inverter washing machine according to the prior art.

As shown in FIG. 1, the motor control apparatus of the inverter washing machine according to the related art includes a rectifying unit 11 for receiving and rectifying commercial AC power, and a motor 12 for supplying rotational force to a washing tank or pulsator of the washing machine. And an inverter including a plurality of insulating gate bipolar transistors (IGBTs), the IPM driver 13 supplying three-phase (U / V / W) power to the motor 12, and the IPM driver. According to the request command of the brake resistor BR for driving the brake resistor BR, the transistor Q1 for driving the brake resistor BR, and the user's request command The microcomputer 14 outputs a control signal to the transistor Q1 and the IPM driver 13.

Referring to the basic operation of the inverter washing machine configured as described above are as follows.

First, when a user inputs a washing command through a user interface (not shown), the microcomputer 14 recognizes this and outputs a corresponding control signal.

That is, the DC voltage rectified from the rectifier 11 is driven and driven according to the control signal of the microcomputer 14, and the IPM driver 13 is divided into sections according to the control signal of the microcomputer 14. The motor 12 is driven.

As such, when the user opens or stops the washing machine door during the driving or dehydration stroke of the washing machine, the washing machine must stop suddenly, and outputs a control signal to the IPM driver 13 so that the motor 12 can be reversed braking. do.

However, at this time, since the DC link voltage output from the rectifier 11 increases, the microcomputer 14 outputs a high signal to the base of the transistor Q1 to consume a reverse voltage, thereby preventing the braking resistor ( It drives heat energy by driving BR).

In addition, when the braking resistor BR is disconnected or the connector is removed, energy is not consumed during rapid braking, and the voltage of the DC link terminal is rapidly increased, thereby switching devices such as the IPM driver 13 and the like. It leads to a situation that burns them out.

Accordingly, in order to detect whether the braking resistor BR is disconnected, a second resistor R2 having one end connected to the collector and the connector of the transistor Q1 and one end thereof connected to the second resistor R2. The other end has a first resistor R1 connected to an input of a bridge diode BD of the rectifier 11.

In addition, as the output value VS1 of the point where the first and second resistors R1 and R2 are connected to the microcomputer 14 is input, the microcomputer 14 detects an abnormality of the braking resistor BR. .

That is, when the microcomputer 14 detects an abnormality of the braking resistor BR, an error message is output without proceeding with the dehydration stroke.

However, the inverter washing machine according to the prior art detects the braking resistor (BR) during reverse braking operation and stops the dehydration process and outputs an error message. There is no way to solve this problem of rising to burn out the switching elements of the IPM driver (13).

Therefore, the present invention has been made to solve the above problems, and it detects the abnormality of the braking resistor during the reversed phase braking operation, and also detects the voltage of the DC link stage, thereby increasing the voltage of the DC link stage when the braking resistor is to be disconnected. Its purpose is to convert power generation braking that does not occur.

In addition, when the braking resistor is deteriorated and disconnected during the reverse phase braking operation, another purpose is to prevent the IPM driving and other power devices from being burned out as the voltage of the DC link terminal rises.

Motor control device of the inverter washing machine according to the present invention for achieving the above object is a rectifying unit for receiving the rectified commercial AC power, a motor for supplying rotational power to a washing tank or pulsator of the washing machine, and a plurality of IGBT (Insulating In an inverter washing machine comprising an inverter having a gate bipolar transistor and supplying three-phase (U / V / W) power to the motor, the motor consumes generation voltage as heat when braking in reverse phase. To the brake resistor BR, the transistor Q1 for driving the brake resistor BR, the first detector for detecting the output terminal voltage of the transistor Q1, and the DC link stage output from the rectifier. A second detector for detecting a voltage and a control signal according to a user request command, and at the same time a voltage difference detected through the first detector and the second detector; D. It is composed of microcomputer that selectively controls reverse phase braking and power generation braking.

Preferably, the first detector includes first and second resistors R1 and R2 connected in series to an output terminal of the transistor Q1, and the second detector includes third and third devices connected in series across the rectifier DC link. It consists of 4 resistors (R3) and (R4).

More preferably, the divided voltage values of the first and second resistors R1 and R2 are input to the first detection value VS1 of the microcomputer, and the third and fourth resistors R3 and R4 are distributed. The voltage value is input as the second detection value VS2 of the microcomputer, which has a feature.                     

More preferably, the microcomputer has a characteristic of stopping sudden braking of the motor and switching to generating braking when the voltage difference between the detection values VS1 and VS2 of the first and second detection units is equal to or greater than a predetermined value. .

Motor control method of the inverter washing machine according to the present invention for achieving the above object is a rectifying unit for receiving a rectified commercial AC power, a motor for supplying rotational power to a washing tank or pulsator of the washing machine, and a plurality of IGBT (Insulating Gate) In the inverter (Inverter) having a Bipolar Transistor (IP) driver for supplying three-phase (U / V / W) power to the motor and the abnormality detection method of the inverter washing machine equipped with a braking resistor, the user operates Inputting a start command to perform washing, rinsing, and dehydrating strokes according to the selected course; and when reversed braking is performed during the dehydrating stroke, a first voltage value according to whether the braking resistor is disconnected and the DC link stage of the rectifying unit. Comparing the second voltage value of the switching to the power generation braking according to the result is characterized.

Preferably, the step of switching to power generation braking includes calculating a difference between the first voltage value and the second voltage value according to whether the braking resistor is disconnected, and determining whether the calculated voltage difference is greater than or equal to a predetermined value. And stopping the reverse braking if the calculated voltage difference is equal to or greater than a predetermined value and converting the power generation to braking.

2 is a circuit diagram illustrating a motor control apparatus of an inverter washing machine according to the present invention with reference to the accompanying drawings, and FIG. 3 is a flowchart illustrating a motor control method of the inverter washing machine according to the present invention.

The same reference numerals will be given to the same components as those shown in FIG. 1.

As shown in FIG. 2, the motor control apparatus of the inverter washing machine according to the present invention includes a rectifying unit 11 for receiving and rectifying commercial AC power, and a motor 12 for supplying rotational force to a washing tank or pulsator of the washing machine. And an inverter including a plurality of insulating gate bipolar transistors (IGBTs), the IPM driver 13 supplying three-phase (U / V / W) power to the motor 12, and the IPM driver. The braking resistor BR for preventing circuit damage by consuming the generated voltage of the motor 12 reversed in step 13 with the heat, the transistor Q1 for driving the braking resistor BR, and the transistor Q1 A first detection unit 101 for detecting an output terminal voltage, a second detection unit 102 for detecting a voltage of the DC link terminal output from the rectifier 11, and a corresponding control signal according to a user request command Through the first detection unit 101 and the second detection unit 102 And a microcomputer 103 for selectively controlling reverse phase braking and power generation braking in accordance with the detected voltage difference.

Here, the first detector 101 includes a second resistor R2 having one end connected to the collector of the transistor Q1, and one end connected to the second resistor R2, and the other end thereof being an input terminal of the rectifier 11. And a divided voltage value of the first and second resistors R1 and R2 is input to the first detection value VS1 of the microcomputer 103.

In addition, the second detector 102 includes a third resistor R3 having one end connected to an output terminal of the rectifier 11, and one end connected to the third resistor R3, and the other end thereof being the rectifier 11. A fourth resistor R4 connected to an input terminal of the fourth resistor R4 is connected in series, and the divided voltage values of the third resistor R3 and the fourth resistor R4 are input to the first detection value VS2 of the microcomputer 103. do.

Referring to the operation of the brake circuit abnormality detection device of the inverter washing machine according to the present invention configured as described above are as follows.

When the user selects the desired washing course through a user interface (not shown) and inputs an operation start command, the microcomputer 103 receives the input and drives the corresponding load according to the power supply and the selected course to wash, rinse, and dewater. Perform the strokes sequentially.

As described above, when the door is opened or the stop key input is present during the dehydration operation, the microcomputer 103 outputs a high signal to the base of the transistor Q1, so that the transistor Q1 is turned on. As the transistor Q1 is turned on, the braking resistor BR is driven, and the motor 12 performs reverse phase braking.

At this time, the microcomputer 103 receives the first detection voltage VS1 detected by the first detector 101 and the second detection voltage VS2 detected by the second detector 102 and compares the two values with each other. If the difference is equal to or more than a predetermined value, reverse braking is stopped and power generation braking is switched.                     

This is because the first detection unit 101 detects whether the braking resistor BR is disconnected, and the first detection unit 101 detects when the braking resistor BR is about to be disconnected. By lowering the value VS1, the detection values of the first detection unit 101 and the second detection unit 102 are different from each other by a predetermined value or more.

Therefore, by switching to power generation braking without increasing the voltage of the DC link terminal, it is possible to prevent burnout of the IPM driver 13 and the power elements in advance.

The motor control method of the inverter washer according to the present invention configured as described above will be described with reference to FIG. 3. First, when a power-on command is input, a user selects a desired course (S101 to S102).

When the user inputs an operation start command, washing, rinsing, and dehydration are performed according to the selected course (S103 to S104).

Subsequently, it is determined whether reverse braking is performed during the dehydration operation (S105).

As a result of the determination (S105), if reversed braking is performed, the first detection value VS1 and the second detection value VS2 are compared (S106).

In operation S107, it is determined whether the voltage difference between the first and second detection values VS1 and VS2 is greater than or equal to a predetermined value.

Subsequently, when the detected voltage difference is greater than or equal to a predetermined value, the determination result (S107) stops reverse phase braking (rapid braking) and switches to generation braking (S109).

On the other hand, if the reverse phase braking is not performed during the dehydration stroke (S105), the operation is continued until the operation is completed (S110).                     

Therefore, the motor control apparatus and method of the inverter washing machine according to the present invention performs reverse phase braking in an inverter circuit for driving the BLDC motor 12 to suddenly stop the washing machine when the user opens or stops the washing machine door during the dehydration operation. In this case, in consideration of the increase of the voltage of the DC link stage, the breakdown of the braking resistor BR and the voltage of the DC link stage are sensed to convert the reverse phase braking to power generation braking to prevent the voltage rise of the DC link stage. Can be.

As described above, the motor control apparatus and method of the inverter washing machine according to the present invention have the following effects.

First, stop the reverse phase braking (quick braking) when grasping the state of the braking resistor and switching to power generation braking so that the voltage rise of the DC link stage does not occur.

Second, since the voltage rise of the DC link stage does not occur, the burnout of the IPM driver and the power supply element can be prevented in advance.

Third, the service cost can be minimized by replacing only the braking resistor during service.

Fourth, safety accidents such as explosion sound and fire of the power device can be prevented in advance.

Claims (6)

It is composed of a rectifier for rectifying and receiving commercial AC power, a motor for supplying rotational force to a washing tank or pulsator of a washing machine, and an inverter equipped with a plurality of IGBTs (Insulating Gate Bipolar Transistor). In the motor control device of the inverter washing machine having an IPM drive unit for supplying phase (U / V / W) power, A braking resistor (BR) for dissipating the generated voltage as heat when the motor reverses braking; A transistor Q1 for driving the braking resistor BR; A first detector configured to detect an output terminal voltage of the transistor Q1; A second detector detecting a voltage of the DC link terminal output from the rectifier; And, And a microcomputer for selectively outputting a control signal according to a user's request and selectively controlling reverse phase braking and power generation braking according to a voltage difference detected by the first and second detectors. Motor control of the washing machine. The method of claim 1, The first detector includes first and second resistors R1 and R2 connected in series to an output terminal of the transistor Q1, and the second detector includes third and fourth resistors connected in series across the rectifier DC link. R3, R4) motor control device of the inverter washing machine, characterized in that consisting of. The method of claim 2, The divided voltage values of the first and second resistors R1 and R2 are input to the first detection value VS1 of the microcomputer, and the divided voltage values of the third and fourth resistors R3 and R4 are input to the microcomputer. The motor control device of the inverter washer, characterized in that the input as a second detection value (VS2). The method of claim 1, The microcomputer stops the rapid braking of the motor when the voltage difference between the detection values VS1 and VS2 of the first detection unit and the second detection unit is greater than or equal to a preset value, and controls the microcomputer to switch to power generation braking. Control unit. It is composed of a rectifier for rectifying and receiving commercial AC power, a motor for supplying rotational force to a washing tank or pulsator of a washing machine, and an inverter equipped with a plurality of IGBTs (Insulating Gate Bipolar Transistor). In the motor control method of the inverter washing machine equipped with an IPM drive unit for supplying a phase (U / V / W) power and a braking resistor, Performing washing, rinsing, and dehydrating operations according to a selected course when a user inputs an operation start command; And, If reverse phase braking is performed during the dehydration operation, comparing the first voltage value according to whether the braking resistor is disconnected and the second voltage value of the DC link terminal of the rectifying unit and converting the power generation braking according to the result. Motor control method of the inverter washer, characterized in that made. The method of claim 5, The step of switching to the power generation braking Calculating a difference between the first voltage value and the second voltage value according to disconnection of the braking resistor; Determining whether the calculated voltage difference is equal to or greater than a predetermined predetermined value; The motor control method of the inverter washing machine characterized in that the step of stopping the reverse braking (rapid braking) if the calculated voltage difference is equal to or more than a predetermined value, and switching to the power generation braking.

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