JP2001327175A - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by stopping an operation when a specific abnormality occurs prescribed number of times or more to prevent advance of an overheat or the faultral due to advance of abnormality by restarting the operation in an inverter device for driving a motor by an inverter circuit. SOLUTION: An AC power is applied to a rectifier 4 via a power source switching means 3 connected to an AC power source 1. A DC power of a rectifier 4 is converted into an AC power, and a motor 7 is driven. An overcurrent of the inverter circuit 5 is detected by an overcurrent detecting means 6. A control means 12 has an inverter control circuit 12a for controlling the means 3 and the inverter circuit 5 to decide a fault content of the inverter circuit 5 or the motor 7, an inverter drive circuit 12b for driving the inverter circuit 5, a switching means drive circuit 12c for driving the means 3, and a memory means 12d for storing the fault content. The means 12 inhibits an operation when the fault content stored in the means 12d occurs predetermined times or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for driving a motor by an inverter circuit.

[0002]

2. Description of the Related Art In recent years, an electric washing machine or a dishwasher for home use has been proposed in which the rotation speed of a motor is controlled by an inverter device to improve dehydration performance or pump performance.

Conventionally, this type of washing machine has been disclosed in
No. 8491 was constructed. That is,
The washing motor is driven by the inverter circuit, and if the current value of the inverter circuit is equal to or more than a predetermined value, the operation is stopped.

[0004]

However, in such a conventional configuration, even when the inverter circuit is stopped by detecting any abnormality, the operation is performed by turning off the power once and then turning on the power again. Was resumed, and there was a drawback that the abnormality was repeated many times.

[0005] The present invention solves the above-mentioned conventional problems.
If a specific abnormality occurs more than a predetermined number of times, the operation is stopped to prevent the operation in the abnormal state from being repeated, and by repeating the operation, it is possible to prevent the abnormality from progressing and prevent overheating and failure from progressing, and improve reliability. It aims to improve.

[0006]

According to the present invention, in order to achieve the above object, a rectifier circuit is connected in series to an AC power supply via power supply switching means for controlling the opening and closing of the power supply, and the DC power of the rectifier circuit is converted to an inverter. The circuit is converted into AC power to drive the motor, the overcurrent of the inverter circuit is detected by the overcurrent detection means, and the inverter circuit is controlled by the control means. Inverter control circuit that controls and determines the content of abnormality in the inverter circuit or motor, inverter drive circuit that drives the inverter circuit by the output signal of the inverter control circuit, switching device drive circuit that drives the power switching device, and stores the content of the abnormality Storage means consisting of a non-volatile memory, which operates when the number of specific abnormalities stored in the storage means exceeds a predetermined number of times. It is obtained so as to prohibit.

Accordingly, when a specific abnormality occurs more than a predetermined number of times, the operation can be stopped to prevent the operation in the abnormal state from being repeated. Can be prevented from progressing, and the reliability can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises an AC power supply, power supply switching means for controlling the opening and closing of the power supply, and a rectifier circuit connected in series with the power supply switching means and the AC power supply. An inverter circuit for converting DC power of the rectifier circuit into AC power, overcurrent detection means for detecting overcurrent of the inverter circuit, a motor driven by the inverter circuit, and control means for controlling the inverter circuit An inverter control circuit that controls the power supply opening / closing means and the inverter circuit to determine the content of abnormality in the inverter circuit or the motor; and drives the inverter circuit by an output signal of the inverter control circuit. An inverter drive circuit, an open / close means drive circuit for driving the power supply open / close means, and a non-volatile memory for storing the contents of the abnormality. And a storage unit consisting of Li,
The operation is prohibited when the content of the specific abnormality stored in the storage means exceeds a predetermined number of times.If the specific abnormality occurs more than a predetermined number of times, the operation is stopped and the operation in the abnormal state is repeated. Can be prevented
If the inverter is repeatedly operated in an abnormal state, such as a short-circuit failure of a power semiconductor constituting an inverter circuit or a disconnection failure of a motor, it is possible to prevent a failure from advancing or an abnormal overheating. In addition, when an abnormality occurs due to some kind of failure and sometimes operates normally, the user can repeatedly operate to prevent the abnormality from progressing and prevent overheating and failure from proceeding, thereby improving reliability. it can.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided an operation display means capable of informing operation setting of the operation content of the inverter circuit, and the control means includes When the content of the abnormality becomes a predetermined number of times or more, the operation display means notifies the content of the abnormality and prohibits the driving.When a specific abnormality occurs a predetermined number of times or more, the driving is stopped and the operation display is performed. The user can be informed of the prohibition of driving by the abnormality notification by the means.

According to a third aspect of the present invention, in the second aspect of the present invention, the control unit is configured to store the specific abnormality stored in the storage unit immediately after the power supply switching unit is closed or immediately before the start of the inverter operation. It is determined whether or not the content is equal to or more than a predetermined number of times, and if the content is equal to or more than the predetermined number of times, the operation display means notifies the content of the abnormality and prohibits driving,
Since the abnormality that has repeatedly occurred before the start of the operation is notified, it is possible to inform the user of the use prohibition abnormality that has occurred during the operation.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the control means operates the operation display means by a specific operation which is not normally used, so that the abnormality content stored in the storage means is controlled. Can be deleted, and when the failure repair is completed, the contents of the abnormality can be cleared and the operation can be resumed.

According to a fifth aspect of the present invention, in the first aspect of the present invention, there is provided a position detecting means for detecting a rotor position of the motor, wherein the control means comprises: an output control signal of an inverter control circuit; An abnormality in the rotation of the motor is detected from an output signal of the detection means, and when the abnormality in the rotation is stored in the storage means a predetermined number of times or more, the operation is prohibited. It is possible to prevent abnormal overheating or the like that occurs.

According to a sixth aspect of the present invention, in the first aspect of the invention, the control means detects a current abnormality of the inverter circuit based on an output signal of the overcurrent detection means. The operation is prohibited when the number of times is stored in the storage means more than the number of times, and it is possible to prevent abnormal overheating, short-circuit failure, and the like caused by repeated operation due to an abnormality of the power semiconductor constituting the inverter circuit.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a washing machine according to an embodiment of the present invention;

As shown in FIG. 1, an AC power supply 1 is connected to a line filter 2, applies AC power to a rectifier circuit 4 via a power supply opening / closing means 3, and converts the power into DC power by the rectifier circuit 4. The power opening / closing means 3 includes a power relay 30 and a series connection of a start switch 31 and a resistor 32 connected in parallel. The rectifier circuit 4 constitutes a voltage doubler rectifier circuit,
When the AC power supply 1 has a positive voltage, the capacitor 41a is charged by the full-wave rectifier diode 40, and when the AC power supply 1 has a negative voltage, the capacitor 41b is charged, and a double voltage is applied across both ends of the capacitors 41a and 41b connected in series. A DC voltage is generated, and a doubled DC voltage is applied to the inverter circuit 5.

The inverter circuit 5 is constituted by a three-phase full-bridge inverter circuit composed of six power switching semiconductors and anti-parallel diodes, and is usually an intelligent circuit incorporating a power transistor, anti-parallel diode, its driving circuit and a protection circuit. It is composed of a power module (hereinafter referred to as IPM). Inverter circuit 5
An overcurrent detection means 6 is connected between the inverter circuit 5 and the rectifier circuit 4 to detect an overcurrent abnormality of the inverter circuit 5. Inverter circuit 5
A motor 7 is connected to the output terminal of the agitating blade (not shown).
Alternatively, a dehydration tank (not shown) is driven.

The motor 7 is constituted by a DC brushless motor, and a relative position (rotor position) between a permanent magnet constituting a rotor and a stator is detected by a position detecting means 7a. The position detecting means 7a is usually constituted by a Hall IC.

A water supply valve 8, a drain valve 9, and a clutch 10 are connected between the output AC voltage terminals of the power supply opening / closing means 3 and controlled by a switching means 11. The water supply valve 8 supplies tap water to a washing tub (not shown), and is constituted by an electromagnetic valve, and the drain valve 9 controls drainage of water in the washing tub. The clutch 10 controls whether the rotation drive shaft of the motor 7 is connected to the stirring blade or the dewatering tub. Switching means 1
Reference numeral 1 denotes a solid state relay such as a bidirectional thyristor or a mechanical relay.

The control means 12 controls the power switching means 3, the inverter circuit 5, the motor 7 and the switching means 11, and is constituted by a microcomputer. The control means 12 controls the power switching means 3 and the inverter circuit 5 to control the inverter circuit 5.
Alternatively, an inverter control circuit 12a for determining the details of the abnormality of the motor 7, an inverter drive circuit 12b for controlling the inverter circuit 5 based on an output signal of the inverter control circuit 12a to control the rotation of the motor 7, and an output of the inverter control circuit 12a. An opening / closing means driving circuit 12c for driving the power supply relay 30 of the power supply opening / closing means 3 by a signal; a storage means 12d composed of a non-volatile memory for storing the content and the number of abnormalities detected by the inverter control circuit 12a; Operation display means 12e for displaying
And a switching means driving circuit 12f for driving the switching means 11.

In order to turn on the power by the power opening / closing means 3,
When the start switch 31 for the momentary operation is pressed, the capacitors 41a and 41b of the rectifier circuit 4 are charged with a DC voltage via the start switch 31 and the resistor 32, and a DC-DC converter circuit (not shown) connected to both ends of the capacitor 41b. ) Starts the oscillating operation and applies a DC voltage to the control means 12. The inverter control circuit 12a is composed of a microcomputer and its peripheral circuits. When the reset circuit of the microcomputer operates to release, the program of the microcomputer operates. Perform the holding operation.

When the operation is completed, the output signal of the inverter drive circuit 12b is turned off by the inverter control circuit 12a to stop the drive of the motor 7, and then the output of the opening / closing means drive circuit 12c is turned off to turn off the power supply relay 30. Cut off.

FIG. 2 shows an embodiment of a flowchart of the abnormality protection according to the present invention.

In step 100, the power switch 31 is pressed and the program of the control means 12 is started.
At 01, the power supply relay 30 of the power supply opening / closing means 3 is closed to perform a self-holding operation. Next, the process proceeds to step 102 to wait for key input from the operation display unit 12e, and it is determined in step 103 whether a specific key input has been set. The specific key input indicates a key input operation performed when the repair technician checks the contents of the self-diagnosis abnormality, for example, when the power switch 31 and the start switch of the operation display unit 12e are simultaneously pressed.

When a self-diagnosis operation such as an abnormality check is performed in step 103, the process proceeds to step 104, and step 1 is performed.
In step 05, a key input of more detailed contents of the self-diagnosis is accepted. Displays the contents of the abnormality that has occurred in the past on the operation display means 12e. Usually, the content of the error is displayed in alphanumeric characters. Next, the process proceeds to step 109 and waits for a key input.
When the operation of erasing the abnormal memory content is performed in step 10,
Proceeding to step 111, all abnormal contents are deleted from the storage means 12d.

If a specific input operation such as an abnormality check is not performed in step 103, the process proceeds to step 112, and if the start key is operated, the process proceeds to step 113.

In step 113, the contents of the abnormality are read from the storage means 12d, and the flow advances to step 114 to input the number of abnormal contents, that is, the abnormality counter K.
In step 15, the abnormal counter K is compared with the maximum set value Nm.
Proceeding to 16, the abnormality is notified, and the operation is not started but stopped by the notification of the content of the abnormality.

If the abnormality counter K is less than the maximum set value Nm, the routine proceeds to step 117, where the operation of the inverter circuit 5 is started and the rotation of the motor 7 is started.

FIG. 3 shows an embodiment of a subroutine program for judging abnormality of the inverter device according to the present invention, which is a subroutine for driving the DC brushless motor 7 by the inverter circuit 5.

A subroutine starts from step 200. At step 201, initial settings of a PWM initial value and initial settings such as clearing of an abnormal timer are performed. Next, step 2
In step 02, the output signal A of the position detecting means 7a is input. The position detecting means 7a detects a relative angle of 60 degrees between the stator and the rotor, and is usually composed of three Hall ICs, and the output signal is a 3-bit digital signal.

In step 203, a drive signal for the power transistor of the inverter circuit 5 is output in accordance with the output signal A of the position detecting means 7a, and in step 204, the output signal of the overcurrent detection circuit 6 is input. It is determined whether or not the current is equal to or greater than the overcurrent set value Imax. If the current is an overcurrent, the process proceeds to step 206 to stop driving the inverter circuit 5. Next, proceeding to step 207, the contents of the overcurrent abnormality and the number of abnormalities are stored in the storage unit 12d.
Proceed to 8 to perform abnormality notification. The abnormality notification is canceled by turning off the power.

If it is determined in step 209 that the overcurrent is not abnormal, the process proceeds to step 209 to count the abnormal timer counter T. The abnormal timer counter T counts the rotation period of the rotor, and detects whether the rotor has rotated. Step 210 is a step for detecting the position
Is input again, and the signal is denoted as A '. In step 211, the previous signal A and the current signal A'
Are compared, and if they are equal, the routine proceeds to step 212, where it is determined whether the abnormal timer counter T is larger than the maximum set value Tmax. If it is larger, the routine proceeds to step 213 to stop driving the inverter circuit 5, and step 214 Then, the process proceeds to step S215, where the details of the rotation abnormality and the number of times of abnormality are stored in the storage unit 12d.

If the rotor has rotated in step 211, the previous signal A and the current signal A 'are different.
Proceeding to step S16, the rotation cycle of the motor 7 is calculated.
Proceeding to step 17, calculate the PWM value of the speed control,
Proceeding to 18, the abnormal timer counter T is cleared. Next, the routine proceeds to step 219, where it is determined whether or not the operation is to be terminated. If it is, the routine proceeds to step 220 to terminate the motor operation control subroutine.

In the actual motor rotation control program, the output signal of the overcurrent detecting circuit 6 and the output signal of the position detecting means 7a are applied to an interrupt input terminal of the microcomputer. When the interrupt signal of the overcurrent detection circuit 6 is generated, the process jumps to step 206 to stop the inverter circuit 5, and when the interrupt signal of the position detection means 7a is generated, the cycle calculation of step 216 or the power transistor drive control of step 203 is performed. If the interrupt signal of the position detecting means 7a is not generated, the motor is not rotating, and the count of the abnormal timer counter T is continued. However, basically, it is almost the same as the flowchart of FIG.

[0034]

As described above, according to the first aspect of the present invention, the AC power supply, the power supply switching means for controlling the opening and closing of the power supply, and the series connection of the power supply switching means and the AC power supply. Rectifier circuit, an inverter circuit for converting DC power of the rectifier circuit to AC power, overcurrent detection means for detecting overcurrent of the inverter circuit, a motor driven by the inverter circuit, and the inverter circuit Control means for controlling the power supply switching means and the inverter circuit to determine the content of abnormality of the inverter circuit or the motor, and an output signal of the inverter control circuit, An inverter drive circuit for driving the inverter circuit;
An opening / closing means driving circuit for driving the power supply opening / closing means; and a storage means comprising a non-volatile memory for storing the contents of the abnormality, wherein the operation is prohibited when a specific abnormality content stored in the storage means exceeds a predetermined number of times. The inverter circuit and motor will not be used repeatedly even if an abnormality occurs in the inverter circuit or motor, so that the inverter circuit or motor will not be overheated or destroyed due to repeated abnormal use, and the reliability will be improved. Can be improved.

According to the second aspect of the present invention, there is provided an operation display means capable of informing the operation setting of the operation of the inverter circuit, and the control means determines whether the specific abnormality content stored in the storage means is a predetermined number of times. As described above, since the operation display means notifies the user of the abnormality and prohibits the operation, the user can be notified of the failure that cannot be used repeatedly by the abnormality notification.

According to the third aspect of the present invention, the control means determines whether the specific abnormality content stored in the storage means is equal to or more than a predetermined number of times immediately after the power supply opening / closing means is closed or immediately before the start of the inverter operation. It is determined whether or not if the predetermined number of times or more, the operation display means notifies the details of the abnormality and prohibits the driving. By notifying the user of the abnormality and prohibiting use, it is possible to prevent the inverter circuit and the motor from being overheated or damaged.

According to the fourth aspect of the present invention, the control means can delete the abnormal contents stored in the storage means by operating the operation display means by a specific operation which is not normally used. Therefore, when the repair is completed, the contents of the abnormality can be cleared and the operation can be restarted, and the control means can be reused without being discarded or replaced.

According to the fifth aspect of the present invention, there is provided a position detecting means for detecting a rotor position of the motor, wherein the control means uses an output control signal of an inverter control circuit and an output signal of the position detecting means. Since the abnormal rotation of the motor is detected and the operation is prohibited when the abnormal rotation is stored in the storage means a predetermined number of times or more, it is possible to prevent abnormal overheating or the like caused by repeated operation due to the abnormality of the motor. It is possible to prevent the progress of abnormal overheating and the generation of fire and smoke.

According to the invention described in claim 6, the control means detects the abnormal current of the inverter circuit based on the output signal of the overcurrent detecting means, and stores the abnormal current in the storage means a predetermined number of times or more. The operation is prohibited when it is performed, so that it is possible to prevent abnormal overheating or short-circuit failure caused by repeated operation due to the abnormality of the power semiconductor that constitutes the inverter circuit. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an inverter device according to one embodiment of the present invention.

FIG. 2 is a flowchart of an abnormality protection program of the inverter device.

FIG. 3 is a flowchart of a subroutine program for abnormality determination of the inverter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 3 Power supply switching means 4 Rectifier circuit 5 Inverter circuit 6 Overcurrent detection means 7 Motor 12 Control means 12a Inverter control circuit 12b Inverter drive circuit 12c Opening / closing means drive circuit 12d Storage means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 AA01 AA06 BA12 BA13 BB04 CB06 HB10 JB06 KA40 LA04 LA11 LB24 LC15 LC30 LC33 LC34 LC35 5H007 AA05 AA06 AA17 BB06 CA01 DA05 DB03 DB12 DB13 DC02 EA02 FA03 GA01 GA05 GA07 BB05 DA03 DA19 EB01 GG04 JJ02 JJ06 RR10 SS07 TT13 TT15 UA02 XA12 XB10 5H570 AA13 BB09 CC06 DD04 DD08 HA05 HA06 HB07 LL15 LL31 MM01 MM02 MM05

Claims (6)

[Claims] 1. An AC power supply, a power supply opening / closing means for controlling opening / closing of a power supply, a rectifier circuit connected in series with the power supply opening / closing means and the AC power supply, and an inverter for converting DC power of the rectification circuit into AC power. Circuit, overcurrent detection means for detecting an overcurrent of the inverter circuit, a motor driven by the inverter circuit, and control means for controlling the inverter circuit, wherein the control means, the power switching means An inverter control circuit that controls the inverter circuit and determines an abnormality content of the inverter circuit or the motor; an inverter drive circuit that drives the inverter circuit by an output signal of the inverter control circuit;
An opening / closing means driving circuit for driving the power supply opening / closing means; and a storage means comprising a non-volatile memory for storing the contents of the abnormality, wherein the operation is prohibited when a specific abnormality content stored in the storage means exceeds a predetermined number of times. Inverter device to be used. 2. An operation display means capable of informing operation setting of an operation content of an inverter circuit, wherein the control means controls the operation display means when the specific abnormality content stored in the storage means becomes a predetermined number of times or more. The inverter device according to claim 1, wherein the operation is notified to prohibit the operation. 3. The control means determines whether the content of the specific abnormality stored in the storage means is equal to or more than a predetermined number of times immediately after the power supply opening / closing means is closed or immediately before the start of the inverter operation. 3. The inverter device according to claim 2, wherein the abnormality is notified by means to prohibit operation. 4. The apparatus according to claim 2, wherein the control means operates the operation display means by a specific operation which is not normally used, so that the contents of the abnormality stored in the storage means can be erased.
The inverter device as described. 5. A motor control apparatus comprising: a position detecting means for detecting a rotor position of a motor, wherein the control means detects an abnormal rotation of the motor based on an output control signal of an inverter control circuit and an output signal of the position detecting means. 2. The inverter device according to claim 1, wherein the operation is prohibited when the rotation abnormality is stored in the storage means a predetermined number of times or more. 6. The control means detects an abnormal current in the inverter circuit based on an output signal of the overcurrent detection means,
2. The inverter device according to claim 1, wherein the operation is prohibited when the current abnormality is stored in the storage means a predetermined number of times or more.