JP2001157459A - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fully charge a charge pump capacitor when an electric motor starts to be driven and at the same time securely synchronize the capacitor with the electric motor. SOLUTION: When an AC power supply 5 recovers from power failure, a power failure control circuit 52 simultaneously turns on lower arm drive circuits 32-34 and charges capacitors 39-41. A rotary speed detection part 54 samples a phase signal SA, a rotary speed detection end judgment part 56 alternately and periodically executes the charging operation and the detection operation of the rotary speed of the capacitors 39-41. Then, a phase detection part 53 samples phase signals SA and SB, and a phase detection end judgment part 55 alternately and periodically execute the charging operation of the capacitors 39-41 and the detection operation of phase until the edge detection is completed. When the detection of the rotary speed and phase is completed, a motor 28 starts to be driven based on it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an inverter device provided with a drive power supply based on a charge pump circuit system.

[0002]

2. Description of the Related Art FIG. 16 shows an electrical configuration of an inverter device 1 of this type. In FIG. 16, the DC voltage generated by the DC power supply circuit 2 is supplied to the inverter device 1 via the high potential power supply line 3 and the low potential power supply line 4. The DC power supply circuit 2 is connected to each phase bus of an AC power supply 5 which is, for example, a three-phase commercial power supply, and has a rectifier circuit 12 formed by connecting diodes 6 to 11 in a three-phase bridge.
And a smoothing capacitor 13 connected between the high-potential power line 3 and the low-potential power line 4 to smooth the voltage rectified by the rectifier circuit 12.

The inverter device 1 connected to the DC power supply circuit 2 is configured as follows. The inverter circuit 14 includes IGBTs 15 to 20 and these IGBTs 15 to 2
The return diodes 21 to 26 connected in anti-parallel to 0 are connected in a form of a three-phase bridge between the high-potential power line 3 and the low-potential power line 4, and their output terminals 27u, 27v, 27
w indicates the stator windings 28u, 2
8v and 28w are connected. This synchronous motor 28
The motor (hereinafter, referred to as a motor 28) is a so-called permanent magnet motor in which a permanent magnet is provided on a rotor (not shown).
For example, a fan (not shown) is connected to the rotating shaft of the motor 28 as a load.

[0004] Upper arm drive circuits 29 to 31 for outputting gate drive voltages are connected to the gates of the IGBTs 15 to 17 constituting the upper arm, respectively.
Gates of the GBTs 18 to 20 are connected to lower arm drive circuits 32 to 34 for outputting gate drive voltages, respectively.

The lower arm drive circuits 32 to 34 have a common lower arm drive power supply 35, and the upper arm drive circuits 29 to 31 have charge pump type upper arm drive power supplies 36 to 38, respectively. . The upper arm drive power supplies 36 to 38 are respectively provided with charge pump capacitors 39 to 41 and a charge of a polarity shown in the drawing, which is connected between the positive terminal of the lower arm drive power supply 35 and each positive terminal of the capacitors 39 to 41. Diode 42 for pump
~ 44. And IGB of the lower arm
When T18 to T20 turn on, the capacitors 39 to 41 become
Each is charged from the positive terminal of the lower arm drive power supply 35 through the diodes 42 to 44.

An induced voltage detection circuit 45 (see FIGS. 2 and 3)
Inputs the terminal voltages Vu, Vv, Vw of the motor 28,
The IGBTs 15 to 20 are off (that is, the motor 28
Terminal voltage Vu, Vv, V
An approximately sinusoidal induced voltage appearing in w is detected, and the phase signals SA and SB of the rotor of the motor 28 are output. Further, the control circuit 46 includes the induced voltage detection circuit 4
5, the phase signals SA and SB are input to detect the phase, and the driving of the motor 28 is started based on the detected phase.

[0007] In the inverter device 1 provided with the upper arm drive power supplies 36 to 38 of the charge pump type, the charge pump capacitors 39 to 41 are connected to the IGBTs 15 to 41 when the power is turned on or when the power is restored from a power failure.
17 has not been charged sufficiently. Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-15978, the IG
IGBT of the lower arm with BT15-17 turned off
By turning on 18 to 20, the capacitors 39 to 41 are charged.

[0008]

By the way, the motor 28
If the fan attached to the rotating shaft receives wind pressure,
Alternatively, if the AC power supply 5 fails while the inverter device 1 is driving the motor 28, the motor 28 rotates (free-run state) even though all of the IGBTs 15 to 20 are off. In this free-run state, when the operation start command ST is input to the control circuit 46 or the AC power supply 5 is restored, the inverter device 1 starts driving the motor 28.

In this case, the inverter device 1 is provided so that the motor 28 can be brought into a synchronous state immediately after the start of driving.
It is necessary to detect the phase and rotation speed (including the rotation direction) of the rotor of the motor 28 in advance and apply a gate drive voltage synchronized with the motor 28 to the gates of the IGBTs 15 to 20.

However, these phases and rotation speeds are detected by the induced voltage detection circuit 45 by the terminal voltages Vu and Vu.
Since the detection is performed by detecting the induced voltage appearing in v and Vw, all the IGBTs 15 to 20 must be kept off during the detection period. That is, during the detection period, the capacitors 39 to 41 cannot be charged by the charge pump operation described above.

Therefore, the detection of the phase and the rotation speed and the use of the capacitors 39 to
41 had been charged. The first means is a means for detecting the rotation speed and the phase after charging the capacitors 39 to 41 by the charge pump operation. According to this means, by detecting the phase following the detection of the rotational speed, the motor 28 can be driven immediately after the detection of the phase, and the phase error at the start of driving is reduced, so that the pull-in of the motor 28 is relatively easy. It will be easier.

However, the detection of the phase is, for example, 6 electrical degrees.
The detection is performed by detecting edges of the phase signals SA and SB appearing every 0 ° or 120 °.
For example, this is performed by measuring the time of one cycle of the phase signals SA and SB. Therefore, the detection time becomes long especially at a low rotation speed, and there is a possibility that the charges of the capacitors 39 to 41 are discharged from the charging of the capacitors 39 to 41 to the start of driving of the motor 28.

The second means is to charge the capacitors 39 to 41 by the charge pump operation after detecting the rotation speed and the phase. According to this means, since the motor 28 can be driven immediately after the capacitors 39 to 41 are charged, the upper arm IGBTs 15 to 17 can be reliably driven. However, since it takes time from the detection of the rotation speed and the phase to the start of driving of the motor 28,
Due to the rotation of the motor 28, an error occurs in the rotation speed and phase at the start of driving, and there is a problem that it is difficult to pull in the motor 28 synchronously.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a charge pump type driving power supply, in which a charge pump capacitor can be brought into a sufficiently charged state at the start of driving of an electric motor. Another object of the present invention is to provide an inverter device that can reliably synchronize with an electric motor.

[0015]

According to a first aspect of the present invention, there is provided an inverter apparatus comprising: an upper arm switching element and a lower arm switching element connected in series between DC power supply lines; Inverter circuit, an upper arm drive circuit for driving the upper arm switching element, a lower arm drive circuit for driving the lower arm switching element, and a lower arm drive for supplying a driving DC voltage to the lower arm drive circuit A power supply; and a charge pump capacitor for supplying a drive DC voltage to the upper arm drive circuit. When the lower arm switching element is turned on, the lower arm drive power supply charges the charge pump capacitor. The upper arm drive power supply and the upper arm drive circuit and the lower arm drive circuit. Composed of a control means for outputting a degree.

The control means includes at least a phase detection means for detecting a phase of a rotor of the motor before the motor is driven, and a control means for determining that the phase detection by the phase detection means is completed. Phase detection end determination means for causing the phase detection means to periodically perform a detection operation, and drive start control for starting driving of the electric motor in response to the phase detection end determination means determining that phase detection has ended. Means, the charging operation of the charge pump capacitor is periodically performed until the phase detection end determination means determines that the phase detection has been completed, and the phase detection means does not execute the phase detection operation. Charging control means for generating the drive signal so as to be performed.

According to this configuration, when the control means outputs an ON drive signal to the lower arm drive circuit to turn on the lower arm switching element, the lower arm drive power supply is switched to the upper arm drive power supply via the lower arm switching element. Is charged to the charge pump capacitor, and the upper arm drive circuit can drive the upper arm switching element by the charged charge.

Further, even before the driving of the electric motor is started,
When the load receives an external force (such as wind pressure) or when a power failure occurs during rotational driving, the load is in a rotating state. Even in this case, the control means detects the phase of the rotor before the start of driving of the electric motor, and therefore, based on the phase and, for example, the rotational speed of the electric motor detected before that, at the start of driving the electric motor, Can be synchronized with

The phase detecting means periodically executes the phase detecting operation until the phase detection is completed, and the drive start control means starts driving the motor in response to the completion of the phase detection. The time from the end of the phase detection to the start of driving of the motor is shortened, the phase error at the start of driving is reduced, and synchronization with the motor is facilitated.

Further, the charging control means executes the charging operation of the charge pump capacitor so as not to be performed simultaneously with the phase detecting operation by the phase detecting means, so that the charge pump capacitor can be charged without hindering the phase detecting operation. Moreover, since the charging operation is performed periodically,
The time from the charging of the charge pump capacitor to the start of driving of the motor is shortened, and sufficient charge is accumulated in the charge pump capacitor at the start of driving. Thereby, the upper arm drive circuit can drive the upper arm switching element reliably.

According to a second aspect of the present invention, the control means of the inverter device completes the detection of the rotation speed by the rotation speed detection means for detecting the rotation speed of the motor at least before the driving of the motor. A rotation speed detection end determining means for causing the rotation speed detecting means to periodically perform a detection operation until the rotation speed detection means determines that the rotation speed detection has been completed. The drive operation of the charge pump capacitor is periodically and periodically performed until the start of the motor is started and the rotation speed detection end determination unit determines that the detection of the rotation speed is completed. Charge control means for generating the drive signal so as to be performed while the rotation speed detection operation by the rotation speed detection means is not performed. And said that you are.

According to this configuration, for example, when driving is started from a state in which the motor is rotating, the control means detects the rotation speed of the rotor before the driving of the motor is started. Synchronization with the motor at the start of driving can be achieved based on the phase of the rotor of the motor detected before that.

The rotation speed detecting means periodically executes the rotation speed detection operation until the rotation speed detection is completed, and the drive start control means controls the driving of the motor in response to the completion of the rotation speed detection. Since the start is started, the time from the end of the rotation speed detection to the start of the driving of the electric motor is shortened, the rotation speed error at the start of the driving is reduced, and it is easy to synchronize with the electric motor.

Further, the charging control means executes the charging operation of the charge pump capacitor so as not to be performed simultaneously with the rotation speed detecting operation, so that the charge pump capacitor can be charged without hindering the rotation speed detecting operation. In addition, since the charging operation is performed periodically, the time from charging the charge pump capacitor to starting driving of the motor is shortened.

According to a third aspect of the present invention, in addition to the phase detecting means, the rotational speed detecting means, the phase detecting end determining means, and the rotational speed detecting end determining means, the phase detecting end determining means includes a phase detecting means. Drive start control means for starting driving of the electric motor in response to the determination that the detection of the rotation speed has ended and the rotation speed detection end determination means determining that the detection of the rotation speed has ended, and the phase detection end determination means The charging operation of the charge pump capacitor is periodically performed until the rotation speed detection is completed by the rotation speed detection completion determination unit and the phase detection unit determines that the detection of the phase is completed. Charging that generates the drive signal so as to be performed during the non-execution of the phase detection operation by the rotation speed detection operation by the rotation speed detection unit. Characterized in that it is constituted by a control means.

According to this configuration, for example, when driving is started from a state in which the motor is rotating, the control means detects the phase and the rotation speed of the rotor before the driving of the motor is started. Sometimes it can be synchronized with the motor. Further, the phase detection operation and the rotation speed detection operation are periodically executed, and the motor starts to be driven in response to the completion of the detection of the phase and the rotation speed. It becomes smaller and it becomes easier to synchronize with the motor.

Further, the charge pump capacitor can be charged without hindering the phase detection operation and the rotation speed detection operation. In addition, since the charging operation is performed periodically, the time from charging the charge pump capacitor to starting driving of the motor is shortened.

In the case where a phase detecting means is provided, the controlling means comprises:
It is preferable to include a phase correction unit that corrects the phase of the rotor of the electric motor detected by the phase detection unit. According to this configuration, it is possible to correct a phase error generated due to a time delay from the phase detection to the start of energization of the winding of the motor, and it is possible to more reliably synchronize with the motor at the start of driving. .

The phase detection end determining means determines that the phase detection has been completed when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the phase detection by the phase detecting means ends. (Claim 5). According to this configuration, the time required until the start of driving is limited, and the start of driving is not extremely delayed even when the motor is stopped before starting driving or when the motor is rotating at a low rotation speed. .

When the rotation speed detecting means is provided, the control means preferably includes a rotation speed correction means for correcting the rotation speed of the motor detected by the rotation speed detection means. According to this configuration, it is possible to correct a rotation speed error generated due to a time delay from the detection of the rotation speed to the start of energization to the windings of the motor, and to more reliably synchronize with the motor at the start of driving. it can.

Further, the rotation speed detection termination determining means terminates the detection of the rotation speed when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the rotation speed detection by the rotation speed detection means is completed. It is preferable to determine that (claim 7). According to this configuration,
There is a limit on the time required to start driving, so that even if the motor is stopped before starting driving or rotating at a low rotation speed, starting of driving will not be extremely delayed.

Further, in the case where the control means includes the phase detecting means and the rotational speed detecting means, it is preferable that the control means includes the phase correcting means and the rotational speed correcting means.
According to this configuration, both the phase error and the rotation speed error can be corrected, and the synchronization with the electric motor can be more reliably achieved.

In this case as well, the phase detection end determination means and the rotation speed detection end determination means each terminate the detection when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the detection ends. It is preferable to determine (claim 9). According to this configuration,
There is a limit on the time required to start driving.

In each of the above means, it is preferable that the control means determines the charging operation time of the charge pump capacitor based on a time interval for executing the charging operation of the charge pump capacitor. According to this configuration, even when the interval of the charging operation of the charge pump capacitor changes, the charge of the charge pump capacitor does not run short.

In each of the above means, there is provided a charging voltage detecting means for detecting a charging voltage of the charge pump capacitor, and the charging control means is configured to detect the charging voltage based on the charging voltage detected by the charging voltage detecting means. It is preferable to determine the charging operation time of the capacitor (claim 11).

According to this configuration, for example, when the charge voltage of the charge pump capacitor is high, the charge operation time is short, and when the charge voltage of the charge pump capacitor is low, the charge operation time is long. As a result, the charge voltage of the charge pump capacitor is maintained at a value sufficient for driving.

Preferably, the charging control means generates the drive signal by PWM control. According to this configuration, the drive signal has a repetitive waveform of an ON pulse and an OFF pulse having a short time width. On the other hand, when the lower arm switching element is switched from on to off while the motor is rotating, the current flowing through the lower arm switching element at the time of on returns to the upper arm switching element to flow into the DC power supply, and Increase the voltage between lines (step-up action). According to the above configuration, since the on-pulse width is narrow, this boosting action can be suppressed, and the occurrence of overvoltage of the DC voltage can be prevented.

In this case, it is preferable that the charging control means determines the duty ratio of the drive signal based on the rotation speed of the electric motor. Thus, regardless of the rotation speed of the electric motor, the charge pump capacitor can be charged while suppressing the boosting action.

It is preferable that the charge control means determines the PWM frequency of the drive signal based on the rotation speed of the electric motor. Thus, the charge pump capacitor can be charged while suppressing the boosting action regardless of the rotation speed of the electric motor.

Further, when the drive signal has a PWM waveform, it is preferable that the charging control means determines the time width of the drive signal based on the rotation speed of the motor. According to this configuration, the time width of the drive signal is determined according to the variable setting of the duty ratio and the PWM frequency of the drive signal, so that the charge pump capacitor can be prevented from being undercharged.

In each of the means described above, it is preferable that the charge control means suspends the execution of the detection operation for a predetermined period after executing the charge operation of the charge pump capacitor. According to this configuration, since the detection operation is performed after the lower arm switching element is completely turned off and the boosting action has disappeared, erroneous detection of the phase and the rotation speed is eliminated.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment (corresponding to claim 3) of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 shows an inverter device 51.
The same components as those in FIG. 16 are denoted by the same reference numerals. Here, the high-potential power line 3 and the low-potential power line 4 correspond to a DC power line in the present invention,
IGBTs 15 to 17 are upper arm switching elements, IG
The BTs 18 to 20 correspond to lower arm switching elements.

The control circuit 52 corresponding to the control means is mainly composed of a microcomputer, and its main functions are shown as functional blocks in FIG. The high-level or low-level phase signals SA and SB output from the induced voltage detection circuit 45, which will be described in detail later, are both input to the phase detection unit 53 and the rotation speed detection unit 54 in the control circuit 52.

The phase detecting section 53 as a phase detecting means includes:
At predetermined sampling intervals, the levels of the phase signals SA and SB are sampled, and the levels are sampled by the phase detection end determination unit 5.
5 is output. The rotation speed detection unit 54 as a rotation speed detection unit samples the levels of the phase signals SA and SB at a predetermined sampling interval,
The level is output to the rotation speed detection end determination unit 56.

The phase detection end determination unit 55 as the phase detection end determination unit and the charge control unit determines whether or not the level of the phase signals SA and SB input from the phase detection unit 53 has changed, that is, whether or not the phase detection has ended. The determination is made, and the determination result is output to the drive start control unit 57. Prior to the end of the phase detection, the phase detection end determination unit 55 performs a charge pump operation on the drive control unit 58 when the phase detection unit 53 and the rotation speed detection unit 54 do not sample the phase signals SA and SB. A drive signal for performing the operation is output, and when the phase detection is completed, the detected phase is output to the drive control unit 58.

The rotation speed detection end determination unit 56 serving as the rotation speed detection end determination unit and the charge control unit detects the change in the level of the phase signals SA and SB input from the rotation speed detection unit 54, thereby completing the rotation speed detection. It is determined whether or not the operation has been performed, and the result of the determination is output to the drive start control unit 57. Before the rotation speed detection ends, the rotation speed detection end determination unit 56 sends a charge pump signal to the drive control unit 58 when the phase detection unit 53 and the rotation speed detection unit 54 do not sample the phase signals SA and SB. A drive signal for performing the operation is output, and when the detection of the rotation speed is completed, the detected rotation speed is used as the drive control unit 58.
Output.

The drive start control unit 57 as drive start control means receives the determination results of the phase detection end and the rotation speed detection end from the phase detection end determination unit 55 and the rotation speed detection end determination unit 56, respectively. A drive start command is output to the controller 58.

Before the drive control unit 58 inputs a drive start command from the drive start control unit 57, the phase detection end determination unit 5
5 and a drive signal to the drive circuits 29 to 34 in accordance with the drive signals from the rotation speed detection end determination section 56. Further, after inputting the drive start command from the drive start control unit 57, the drive control unit 58 generates a drive signal using the detected phase and the rotation speed, and thereafter until the drive start command ST stops or Until a power failure occurs, a drive signal is continuously generated by V / F control or the like.

The inverter device 51 includes a power failure detection circuit 59 for detecting a power failure (including an instantaneous power failure) of the AC power supply 5.
Is provided. The power failure detection circuit 59 outputs a power failure detection signal to the control circuit 52 upon detecting a power failure.

FIG. 2 shows the electrical configuration of the induced voltage detection circuit 45. Divided terminal voltages Vu, Vv, Vw
Are input to the terminals Tu, Tv, Tw, and the power supply line VP, diodes Dup, Dvp, Dwp are connected with the power supply line VP side as a cathode.
v, Tw and the ground lines GND, the diodes Dun, D
vn and Dwn are connected. Also, terminals Tu, T
Capacitors Cu, Cv, Cw are connected between v, Tw and the ground line GND, respectively.

A resistor R1 is connected between the output terminal of the comparator CMP1 and the non-inverting input terminal. The output terminal is connected to the terminal T1 (output terminal of the phase signal SA) and connected to the power supply line via the resistor R2. Connected to VP.
The non-inverting input terminal and the inverting input terminal of the comparator CMP1 are connected to terminals Tv and Tu, respectively.
Similarly, a resistor R3 is connected between the output terminal of the comparator CMP2 and the non-inverting input terminal, and the output terminal is connected to a terminal T2 (output terminal of the phase signal SB) and a power supply line via the resistor R4. Connected to VP. The non-inverting input terminal and the inverting input terminal of the comparator CMP2 are connected to terminals Tv and Tw, respectively. The power terminals of the comparators CMP1 and CMP2 are connected to the power line VP and the ground line GND.

Next, an operation when the inverter device 51 starts driving the motor 28 when the motor 28 is rotating in a free-run state, that is, in a non-driving state, will be described with reference to FIGS. .

First, when the inverter device 51 is driving the motor 28, the phase detection end determination unit 55 and the rotation speed detection end determination unit 56 provide a drive signal for performing a charge pump operation to the drive control unit 58. Stop output of Upon receiving a drive start command from drive start control unit 57, drive control unit 58 performs V / F control according to a speed command signal (not shown), and performs PW control on drive circuits 29 to 34.
The M-controlled drive signal is output. And the driving circuit 2
9 to 31 output gate drive voltages to the IGBTs 15 to 17 using the voltages charged in the capacitors 39 to 41 as power supply voltages, and drive circuits 32 to 34 use the lower arm drive power supply 35 as an operation power supply to the IGBTs 18 to 20. Outputs the gate drive voltage. As a result, the motor 28 rotates in synchronization with the AC voltage output from the inverter device 51.

In this drive state, when the lower arm IGBTs 18 to 20 are turned on in accordance with the PWM-controlled drive signal, the capacitors 39 to 41 are charged from the positive terminal of the lower arm drive power supply 35 through the diodes 42 to 44, respectively. Is done.

If, for example, the AC power supply 5 loses power while the motor 28 is being driven, the control circuit 52 and the power failure detection circuit 59 continue to operate for a while until the control power supply voltage drops. Then, the power failure detection circuit 59 outputs a power failure detection signal to the control circuit 52. The control circuit 52 outputs the off drive signal to the drive circuits 29 to 34 when the power failure detection signal is input, and brings the motor 28 into a free-run state. During this free-run state, the lower arm side IGBT 1
Since 8 to 20 are kept off, the upper arm drive power supply 36 to
38 stops the charge pump operation. Therefore, the voltage of the capacitors 39 to 41 gradually decreases, and eventually becomes an insufficient voltage for the operation of the drive circuits 29 to 31.

Thereafter, when the AC power supply 5 is restored, the inverter device 51 resumes the driving of the motor 28 rotating in the free-run state according to the flowchart shown in FIG. That is, when the power failure detection signal from the power failure detection circuit 59 is stopped due to the power recovery, the control circuit 52 simultaneously outputs an ON drive signal to the lower arm drive circuits 32 to 34 and charges the upper arm drive power supplies 36 to 38. A pump operation is performed to charge (main charge) the capacitors 39 to 41 (step S1). After this charging, the control circuit 52 simultaneously outputs an off drive signal to the lower arm drive circuits 32 to 34 to turn off all the IGBTs 15 to 20.

Subsequently, the control circuit 52 (specifically, the rotation speed detection unit 54 shown in FIG. 1) samples the levels of the phase signals SA and SB from the induced voltage detection circuit 45 in order to detect the rotation speed. (Step S2).

FIG. 3 shows the induced voltage and phase signals SA, S
4 shows the waveform of B. The level of each of the phase signals SA and SB is inverted every 180 ° in electrical angle, and the level inversion occurs in any of the phase signals SA and SB at intervals of 60 ° or 120 ° in electrical angle. Therefore, the rotation speed can be obtained by detecting an edge of one of the phase signals SA and SB (hereinafter, referred to as a phase signal SA) and measuring the edge interval.

Now, the control circuit 52 (specifically, the rotation speed detection end determination unit 56 shown in FIG. 1) performs the processing in step S in FIG.
In step 3, the presence or absence of a level change (that is, an edge) of the phase signal SA is detected, and if an edge is detected, it is determined whether the time measurement of the edge interval has been completed, that is, whether the rotation speed has been detected. Rotation speed detection end determination unit 56
Determines that the detection has not been completed ("NO"), the process proceeds to step S4, and provides a drive signal for performing the charge pump operation to the drive control unit 58. The drive control unit 58 controls the lower arm drive circuit 3 similarly to the main charge.
An ON drive signal is output to all of the capacitors 2 to 34 at the same time, and the capacitors 39 to 41 are charged for a predetermined time. After charging,
The control circuit 52 proceeds to Step S2.

On the other hand, if the control circuit 52 determines in step S3 that the detection has been completed ("YES"), it proceeds to step S5.
Then, the rotation speed is obtained from the measured edge interval.
Then, in step S6, the control circuit 52 performs an operation based on the V / F control using the obtained rotation speed to obtain a voltage to be output from the inverter device 51.

The time required to detect the rotation speed, that is, the execution time of steps S2 and S3,
41 are set so as to be shorter than the time required for discharging the electric charges of .about.41 to a voltage or less sufficient to drive the IGBTs 15 to 17.

Subsequently, the control circuit 52 determines the phase (motor 28
Of the rotor). The control circuit 52 (specifically, the phase detection unit 53 shown in FIG. 1) detects a phase signal SA from the induced voltage detection circuit 45 to detect a phase.
The SB level is sampled (step S7).

The control circuit 52 (specifically, the phase detection end determination section 55 shown in FIG. 1) determines whether or not a level change (that is, an edge) of the phase signal SA or SB has been detected in step S8. As shown in FIG. 3, the edges are such that the rotor has an electrical angle of 90 °, 150 °, 270 °, 330 °.
Occurs when the phase of

When the phase detection end determination section 55 determines that the phase detection has not been completed ("NO"), the process shifts to step S9, and supplies a drive signal for performing a charge pump operation to the drive control section 58. . The drive control unit 58 charges the capacitors 39 to 41 for a predetermined time in the same manner as in step S4. After the charging is completed, the control circuit 52 proceeds to Step S7.

On the other hand, the control circuit 52 (the phase detection end determination section 55) has completed the detection in step S8 (“YE
S ”), the process proceeds to step S10, and the phase is obtained based on the detected edge. This phase is output to the drive control unit 58. Then, in step S11,
The control circuit 52 (specifically, the drive start control unit 5 shown in FIG. 1)
7) outputs a drive start command to the drive control unit 58. The drive control unit 58 outputs a drive signal synchronized with the motor 28 to the drive circuits 29 to 34 based on the detected rotation speed, phase, and output voltage. Accordingly, the inverter device 51 can re-drive the motor 28 that is rotating in the free-run state due to the power failure from the rotation state. After the start of driving, detection of the phase and rotation speed of the rotor may be appropriately executed (not detected in the present embodiment).

The time required for detecting the phase, that is, the execution time of steps S7 and S8 is determined by the capacitors 39-4.
It is set to be shorter than the time required for one charge to discharge below a voltage sufficient to drive the IGBTs 15-17.

As described above, according to the inverter device 51 of this embodiment, the control circuit 52 detects the edges of the phase signals SA and SB output from the induced voltage detection circuit 45 before the start of driving. , The rotational speed of the motor 28 and the phase of the rotor are detected. Then, since the drive signal of the motor 28 is generated using the detection results, the motor 28 rotating in the free-run state can be operated synchronously from the start of the drive.

Therefore, as shown in this embodiment, when the power is restored from the power failure state that occurred during driving, or when the load (the fan in this embodiment) is applied with wind pressure and the motor 28 is rotated by the wind pressure. Etc., the motor 28
Can be immediately driven from its rotating state without being temporarily stopped.

Until the detection of the rotational speed is completed, the operation of detecting the rotational speed and the operation of charging the charge pump capacitors 39 to 41 are alternately and periodically performed. The capacitors 39 to 41 can be charged without hindering the operation. Further, after that, until the phase detection is completed, the phase detection operation and the charging operation of the charge pump capacitors 39 to 41 are performed alternately and periodically, so that the phase detection operation is prevented. And the capacitors 39 to 41 can be charged.

The drive of the motor 28 is started immediately after the phase detection is completed.
The time from the charging operation 1 to the start of driving is shortened, so that the capacitors 39 to 41 can be sufficiently charged at the start of driving. In this embodiment, the rotation speed is detected first, and then the phase is detected. In the free-run state, the rotation speed changes relatively slowly, while the phase changes every moment according to the rotation speed at that time. The phase error at the time can be reduced, and synchronization with the motor 28 can be easily achieved.

(Second Embodiment) Next, a second embodiment (corresponding to claim 1) of the present invention will be described with reference to FIGS. FIG. 5 shows an electrical configuration of the inverter device 60. The inverter device 60 is different from the inverter device 51 shown in FIG. 1 in the configuration of a control circuit 61, specifically, a rotation speed detection end determination unit 62 and a drive start control unit 63.

The rotation speed detection end determination unit 62 measures the edge interval of the phase signal SA or SB input from the rotation speed detection unit 54 until it determines that the detection of the rotation speed has ended. Unlike the rotation speed detection end determination unit 56, the rotation speed detection end determination unit 62 does not execute the charge pump operation during the detection operation. The drive start control unit 6
Numeral 3 receives a determination result from the phase detection end determination section 55 and gives a drive start command to the drive control section 58.

FIG. 6 is a flowchart showing the operation of detecting the rotation speed and phase performed by the control circuit 61. In the following, the contents of control performed when the inverter device 60 starts driving the motor 28 that has entered the free-run state due to a power failure or the like will be described with reference to FIG.

The control circuit 61 (specifically, the rotation speed detection unit 54 and the rotation speed detection end determination unit 62 shown in FIG. 5) detects the rotation speed in step S21. During this detection, the control circuit 61 does not perform the charge pump operation.
Thereafter, the control circuit 61 calculates the rotation speed from the edge interval measured in step S21 (step S22), and calculates the output voltage (step S23). Thereafter, the control circuit 61 performs charging (main charging) of the capacitors 39 to 41 (step S24).

Subsequently, the control circuit 61 executes steps S25 to S25.
In S27, the phase detection operation and the charging operation of the capacitors 39 to 41 are alternately and periodically executed until the phase detection ends. Then, in step S29, the control circuit 61 (specifically, the drive start control unit 63 shown in FIG. 5) outputs a drive start command to the drive control unit 58.

Also in this embodiment, the rotation speed and the phase are detected before the driving is started, and the motor 2
Since the drive signal of No. 8 is generated, the motor 28 in the free-run state from the start of driving can be operated synchronously. In this case, the control circuit 61 executes the main charge after detecting the rotation speed that changes relatively slowly, and then alternately and periodically executes the phase detection operation and the charging operation of the capacitors 39 to 41. Therefore, at the start of driving, a rotation speed and an accurate phase with relatively few errors can be obtained, and the charging voltage of the capacitors 39 to 41 is reduced.
To 17 are sufficient.

Third Embodiment Next, a third embodiment (corresponding to claim 2) of the present invention will be described with reference to FIGS. FIG. 6 shows an electrical configuration of the inverter device 64. The inverter device 64 differs from the inverter device 51 shown in FIG. 1 in the configuration of the control circuit 65, specifically, the configuration of the phase detection end determination unit 66 and the drive start control unit 67.

The phase detection end determination section 66 changes the levels (edges) of the phase signals SA and SB input from the phase degree detection section 53 until it determines that the phase detection has been completed.
Is detected. Unlike the phase detection end determination section 55, the phase detection end determination section 66 does not execute the charge pump operation during the detection operation. Further, the drive start control section 67 receives the detection determination result from the rotation speed detection end determination section 56 and gives a drive start command to the drive control section 58.

FIG. 8 is a flowchart showing the operation of detecting the rotation speed and phase performed by the control circuit 65. Hereinafter, the contents of control in the case where the inverter device 64 starts driving the motor 28 in the free-run state due to a power failure or the like will be described with reference to FIG.

The control circuit 65 (specifically, the phase detection section 53 and the phase detection end determination section 66 shown in FIG. 7)
At 31 the phase of the rotor is detected. During this detection,
The control circuit 65 does not perform the charge pump operation. Thereafter, the control circuit 65 obtains a phase based on the edge detected in step S31 (step S32). afterwards,
The control circuit 65 charges the capacitors 39 to 41 (main charge) (step S33).

Subsequently, the control circuit 65 executes steps S34 to S34.
In S38, until the detection of the rotation speed ends,
The operation of detecting the rotation speed and the operation of charging the capacitors 39 to 41 are alternately and periodically executed. And step S
At 39, the control circuit 65 (specifically, the drive start control unit 67 shown in FIG. 5) outputs a drive start command to the drive control unit 58.

Also in this embodiment, the phase and the rotation speed are detected before the start of driving, and the motor 2
Since the drive signal of No. 8 is generated, the motor 28 in the free-run state can be operated synchronously immediately after the start of driving. In this case, the control circuit 65 executes the main charge after detecting the phase, and thereafter performs the rotation speed detection operation and the capacitor 3.
9 to 41 are alternately and periodically executed.
Therefore, at the start of driving, a phase and an accurate rotation speed can be obtained, and the charging voltage of the capacitors 39 to 41 is a voltage sufficient for driving the IGBTs 15 to 17.

(Fourth Embodiment) Next, a fourth embodiment (corresponding to claim 9) of the present invention will be described with reference to FIG. 9 showing an electrical configuration of an inverter device. The inverter device 68 shown in FIG. 9 is different from the inverter device 5 shown in FIG.
1, the configuration of the control circuit 69, specifically, the configuration of the phase detection end determination unit 70 and the rotation speed detection end determination unit 71 is different.

The phase detection end determination section 70 (corresponding to the phase detection end determination section and the charge control section)
At the same time, the phase detecting operation and the charging operation of the capacitors 39 to 41 are alternately and periodically executed (see steps S7 to S9 in FIG. 4). In this case, the phase detection end determination unit 7
0 (specifically, the limiter 70a shown in FIG. 9) counts the number of charging operations of the capacitors 39 to 41 (the number of executions of step S9 in FIG. 4), and detects a level change of the phase signal SA or SB. Even if not
When the counted number of charging operations reaches a predetermined value, it is determined that the phase detecting operation has been completed (corresponding to step S8).

The rotation speed detection end determination unit 71 (corresponding to the rotation speed detection end determination unit and the charging control unit), together with the rotation speed detection unit 54, alternately performs the rotation speed detection operation and the charging operation of the capacitors 39 to 41. It is executed periodically (see steps S2 to S4 in FIG. 4). In this case, the rotation speed detection end determination unit 71 (specifically, the limiter 71a shown in FIG. 9) counts the number of charging operations of the capacitors 39 to 41 (the number of executions of step S4 in FIG. 4). Phase signal SA (or S
Even if the edge interval of B) is not measured,
When the counted number of charging operations reaches a predetermined value, it is determined that the rotation speed detection operation has been completed (step S
3).

The state where the level change of the phase signal SA or SB is not detected while the charging operation is repeated a predetermined number of times is a state where the motor 28 is stopped or is rotating at an extremely low rotation speed. According to the inverter device 68 of the present embodiment, it is not necessary to keep waiting for the level change of the phase signal SA or SB. Therefore, particularly in the stop state or the low rotation speed state, when the operation start command ST is input or the power is restored from the power failure. Sometimes, the time until the motor 28 is actually started to drive can be reduced. Even in this case, since the charging operation of the capacitors 39 to 41 is performed a predetermined number of times, the charging voltage at the start of driving becomes a voltage sufficient for driving the IGBTs 15 to 17.

If the control circuit 69 cannot detect a change in the level of the phase signal SA or SB, the control circuit 69 determines that the motor 28 is in the stop state or the low rotation speed state, and changes the frequency of the output voltage from the low frequency. Control to increase gradually. Therefore, even if the phase and the rotation speed cannot be detected, the motor 28 can be brought into the synchronous state.

(Fifth Embodiment) Next, a fifth embodiment (corresponding to claims 10 and 11) of the present invention will be described with reference to FIGS.
1 will be described. FIG. 10 shows an inverter device 7.
2 shows the electrical configuration of the inverter device 51 (see FIG. 1), and differs from the inverter device 51 (see FIG. 1) in the configuration of the control circuit 73, specifically, the configuration of the phase detection end determination unit 74 and the rotation speed detection end determination unit 75. Although not shown, the capacitor 39 is provided with a charging voltage detector for detecting its charging voltage, and the detected charging voltage is supplied to the control circuit 73.

The charging operation time control section 74a of the phase detection end determination section 74 (corresponding to the phase detection end determination section and the charging control section) determines the charging operation time of the capacitors 39 to 41 (the execution time of step S9 in FIG. 4). The time interval between the charging operations, that is, the time from the end of the execution of step S9 to the start of the next step S9 is determined according to the charging voltage.

The charging operation time control unit 75a of the rotation speed detection completion determination unit 75 (corresponding to the rotation speed detection completion determination unit and the charging control unit) also includes a charging operation time control unit 74a.
The charging time is determined in the same manner as described above.

FIG. 11 shows the charging operation time control units 74a, 74a.
5 shows a control characteristic of the charging operation time according to 5a. FIG.
1 (a) shows the relationship between the charging operation time interval (horizontal axis) and the charging operation time (vertical axis), and FIG. 11 (b) shows the charging voltage (horizontal axis) and the charging operation time (vertical axis). The relationship is shown.

That is, since the voltage drop of the capacitors 39 to 41 increases as the charging operation time interval increases, the charging operation time control units 74a and 75a control the charging operation to increase in proportion to the time interval. I do. The charging operation time control units 74a and 75a perform control such that the lower the detected value of the charging voltage, the longer the charging operation. This makes it possible to set the charging voltage of the capacitors 39 to 41 to a voltage sufficient for driving at the start of driving.

Although the control circuit 73 is configured to control the charging operation time based on the charging time interval and the charging voltage, the control circuit 73 is configured to control the charging operation time based on only one of them. You may. Further, the phase detection end determination unit 74 and the rotation speed detection end determination unit 75 may include the above-described limiter.

(Sixth Embodiment) Next, a sixth embodiment (corresponding to claims 12 to 15) of the present invention will be described with reference to FIGS. FIG. 12 shows the electrical configuration of the inverter device 76, and the inverter device 51
The configuration of the control circuit 77, specifically, the configuration of the phase detection end determination section 78 and the rotation speed detection end determination section 79 are different from those of FIG.

The PWM control unit 78 of the phase detection end determination unit 78 (corresponding to the phase detection end determination unit and the charge control unit)
a is a PWM signal corresponding to the drive signal output to the drive control unit 58.
It is a circuit that performs control. Similarly, the PWM control unit 79a of the rotation speed detection end determination unit 79 (corresponding to the rotation speed detection end determination unit and the charge control unit) is a circuit that performs PWM control on the drive signal output to the drive control unit 58.

The PWM control units 78a and 79a control the PWM frequency, duty ratio and time width (time corresponding to the charging operation time in the fifth embodiment) of the PWM drive signal according to the rotation speed of the motor 28. It has become. FIG. 13 shows this control characteristic.
The control units 78a and 79a set the PWM frequency higher, set the duty ratio smaller, and set the time width longer as the rotation speed of the motor 28 increases.

At the end of the charge pump operation, that is, when the IGBTs 18 to 20 of the lower arm are switched from on to off, the IGBTs 18 to 20 are induced by the induced voltage of the motor 28.
The current flowing through the upper arm diode 2
It returns to 1 to 23 and flows into the smoothing capacitor 13. As a result, the DC voltage between the high-potential power line 3 and the low-potential power line 4 is boosted. This boosting action increases as the rotation speed of the motor 28 increases and the induced voltage increases. Further, as the rotation speed of the motor 28 increases, the current flowing through the IGBTs 18 to 20 during the charge pump operation increases.

According to this embodiment, the drive signal has a PWM waveform, and the higher the rotation speed of the motor 28, the more the PWM signal becomes.
Since the on-pulse width of the drive signal is reduced, the boosting action can be suppressed and the current flowing through the IGBTs 18 to 20 can be limited. Further, as the on-pulse width of the PWM drive signal becomes narrower, the PWM drive signal length becomes longer, so that the charging voltage of the capacitors 39 to 41 does not decrease.

(Seventh Embodiment) Next, a seventh embodiment (corresponding to claim 16) of the present invention will be described with reference to FIG. The inverter device according to the present embodiment has substantially the same configuration as the inverter device 51 shown in FIG. FIG.
4 is a flowchart showing the drive start processing of the motor 28 executed by the control circuit, which is different from the flowchart shown in FIG. 4 in that steps S41 and S91 are added.

In step S4, the control circuit ends the charging operation of the capacitors 39 to 41 by turning off the IGBTs 18 to 20 of the lower arm from ON to OFF. Thereafter, the control circuit does not immediately proceed to the rotation speed detection in step S2, but waits for a predetermined time in step S41 (delay operation). The same applies to steps S9 and S91.

Even if the IGBTs 18 to 20 are turned off from on and the charge pump operation is completed, the above-described boosting action occurs. Until this boosting action is extinguished, current flows back to the diodes 21 to 26, and the terminal voltages VU and VU
V and VW have the same potential as the high potential power supply line 3 or the low potential power supply line 4, respectively. In this state, the induced voltage detection circuit 4
5 does not output the correct phase signals SA and SB.

According to the present embodiment, the control means shifts to the detection operation after a predetermined time, that is, until the transient phenomenon such as the boosting action disappears after the end of the charge pump operation. Accurate phase signal S
A and SB can be obtained. As a result, an accurate rotation speed and phase can be obtained, and there is no failure in starting the drive and no step-out after the start of the drive.

(Eighth Embodiment) Next, an eighth embodiment (corresponding to claim 8) of the present invention will be described with reference to FIG. 15, which shows an electrical configuration of an inverter device. In the inverter device 80 in the present embodiment, the control circuit 81 includes a phase correction unit 82 (corresponding to a phase correction unit) and a rotation speed correction unit 8.
3 (corresponding to rotation speed correction means).

The control circuit 81 executes the drive start processing according to the flowchart shown in FIG. In this case, there is a slight time delay from the execution of step S5 for obtaining the rotation speed to the start of energization to the stator windings 28u, 28v, 28w of the motor 28. Further, there is a smaller time delay (for example, several milliseconds) from the time of execution of step S10 for obtaining the phase to the start of energization.
Therefore, when the rotation speed is high, an error may occur in the rotation speed and phase at the start of driving due to the time delay.

Therefore, the phase correction section 82 determines in step S1
When obtaining a phase at 0, a phase correction value is obtained by multiplying a rotational speed by a delay time assumed in advance,
The phase correction value is added to the detected phase. Accordingly, the phase correction unit 82 can more accurately determine the phase at the start of driving. Further, the phase correction unit 82 may include a phase correction value tabulated in advance and read the phase correction value from the table.

On the other hand, the rotation speed correction unit 83 determines in step S
The rotation speed is detected twice in steps S2 to S4, and a change rate of the rotation speed is obtained from the rotation speed detected first and the rotation speed detected second. Then, the rotation speed correction unit 83
In step S5, a rotation speed correction value is obtained based on the change rate and a delay time that is assumed in advance, and the rotation speed correction value is added to the detected rotation speed. This allows
The rotation speed correction unit 83 can more accurately determine the rotation speed at the start of driving. Also, the rotation speed correction unit 83
May be provided with a rotation speed correction value tabulated in advance, and the rotation speed correction value may be read from the table.

(Other Embodiments) The present invention is not limited to the embodiments described above and shown in the drawings, and the following expansions or modifications are possible. When an error is allowed in the phase and the rotation speed at the start of driving, the phase detection end determination unit and the rotation speed detection end determination unit output the phase signal S output from the induced voltage detection circuit 45.
Instead of detecting the level change (edge) of A and SB, the level itself may be detected to obtain the phase and the rotation speed.

The induced voltage detection circuit 45 compares the terminal voltages Vu and Vv to obtain the phase signal SA,
Although the phase signal SB is obtained by comparing v with Vw, the phase signal SC may be obtained by further comparing the terminal voltages Vu and Vw. As a result, an edge occurs every 60 °, so that the time until the start of driving can be reduced.

In the first embodiment and the fourth to eighth embodiments, the rotation speed may be detected after the phase is detected. Further, the phase detection and the rotation speed detection may be performed in parallel.

In the second embodiment, the phase detection end determining section 5
5 may be provided with a limiter. In the third embodiment, a limiter may be provided in the rotation speed detection end determination unit 56. Further, the control circuit 61 is provided with a control circuit phase correction unit in the second embodiment, and the control circuit 6 in the third embodiment.
5 may be provided with a rotation speed correction unit.

In each of the above embodiments, a permanent magnet motor was driven as the motor 28, but other motors can be applied. For example, in an induction motor, an induced voltage due to a small residual magnetic field is generated in the stator winding, and the rotation speed and the phase can be detected based on the induced voltage.

The switching elements are not limited to IGBTs.
For example, an FET or a bipolar transistor may be used. Further, the inverter circuit may have a single-phase bridge configuration or a multi-phase bridge configuration.

Although the lower arm drive circuits 32 to 34 have one lower arm drive power supply 35 in common, separate lower arm drive power supplies may be provided individually. In addition, capacitors 39 to
When charging 41, the IGBTs 18 to 20 of the lower arm are turned on and off all at once, but they may be turned on and off at timing independent for each phase.

[0114]

As described above, the inverter device of the present invention is provided with the upper arm drive power source for charging the charge pump capacitor from the lower arm drive power source by the charge pump operation, and periodically at least before driving the motor. The operation of detecting the phase of the rotor is performed, and the drive of the electric motor is started in response to the completion of the detection of the phase.
The configuration is such that the charging operation of the charge pump capacitor is performed periodically and during the non-operation of the phase detection operation until it is determined that the phase detection has been completed. Even with this, synchronization with the electric motor can be achieved using the detected phase.

The phase detection operation and the charging operation of the charge pump capacitor are periodically performed and not performed simultaneously, so that accurate phase detection can be performed.
In addition, the time from when the phase detection operation and the charge pump capacitor charging operation are performed to the start of driving of the motor is shortened, so that the phase error is small at the start of driving and the charge voltage of the charge pump capacitor is increased. Thus, the driving of the electric motor can be started more reliably.

Even when the rotation speed is detected in place of the phase detection, the rotation speed error becomes small at the start of driving, and the charge pump capacitor is fully charged. In this state, the driving can be started reliably.

The phase detection operation and the rotation speed detection operation are periodically performed, and the charging operation of the charge pump capacitor is performed periodically and while the phase and rotation speed detection operations are not performed. As a result, the phase error and the rotational speed error at the start of driving are reduced, and synchronization with the electric motor is further facilitated.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram of an inverter device according to a first embodiment of the present invention.

FIG. 2 is an electrical configuration diagram of an induced voltage detection circuit.

FIG. 3 is a waveform diagram of an induced voltage and phase signals SA and SB.

FIG. 4 is a flowchart showing a rotation speed and phase detection operation;

FIG. 5 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 4;

FIG. 7 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 8 is a flowchart showing a phase and rotation speed detection operation;

FIG. 9 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

11A is a diagram illustrating a relationship between a charging operation time interval and a charging operation time, and FIG. 11B is a diagram illustrating a relationship between a charging voltage and a charging operation time.

FIG. 12 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention.

FIG. 13 shows the rotation speed of the electric motor and the PWM of the PWM drive signal.
Diagram showing the relationship between frequency, duty ratio, and time width

FIG. 14 is a view corresponding to FIG. 4, showing a seventh embodiment of the present invention;

FIG. 15 is a view corresponding to FIG. 1, showing an eighth embodiment of the present invention.

FIG. 16 is a diagram corresponding to FIG. 1 showing a conventional technique.

[Explanation of symbols]

3 is a high-potential power supply line (DC power supply line), 4 is a low-potential power supply line (DC power supply line), 14 is an inverter circuit, 15 to 17 are IGBTs (upper arm switching elements), and 18 to 20 are IGBTs (lower arm switching lines). Elements), 29 to 31 are upper arm drive circuits, 32 to 34 are lower arm drive circuits, 3
5 is a lower arm drive power supply, 36 to 38 are upper arm drive power supplies, 39 to 41 are capacitors (charge pump capacitors), 51, 60, 64, 68, 72, 76, and 80 are inverter devices, 52, 61, 65, 69, 73, 77,
81 is a control circuit (control means), 53 is a phase detection unit (phase detection means), 54 is a rotation speed detection unit (rotation speed detection means), 55, 70, 74, and 78 are phase detection end determination units (phase detection end Determination means, charge control means), 56, 7
Reference numerals 1, 75, and 79 denote rotation speed detection end determination units (rotation speed detection end determination means, charging control means), and reference numerals 57, 63, and 67 denote drive start control units (drive start control means).

Continuing on the front page (72) Inventor Hisanori Shibata 2121, Nao, Nao, Asahi-machi, Mie-gun, Mie Prefecture Inside the Toshiba Mie Plant (72) Inventor Takayuki Ishii 2121, Nagoya, Asahi-machi, Mie-gun, Mie Prefecture, Japan F-term in Toshiba Mie Plant (reference) 5H007 BB06 CA01 CB05 CC07 DB03 DB09 DB12 DC04 DC05 EA02 FA02

Claims (16)

[Claims] An inverter circuit for driving a motor, comprising an upper arm switching element and a lower arm switching element connected in series between DC power supply lines; an upper arm drive circuit for driving the upper arm switching element; A lower arm drive circuit for driving the lower arm switching element; a lower arm drive power supply for supplying a drive DC voltage to the lower arm drive circuit; and a charge pump capacitor for supplying a drive DC voltage to the upper arm drive circuit An upper-arm drive power supply for charging the charge pump capacitor from the lower-arm drive power supply when the lower-arm switching element is in an on state; and driving the upper-arm drive circuit and the lower-arm drive circuit. Control means for outputting a signal. And a phase detecting means for detecting a phase of a rotor of the electric motor before driving the motor, and a detecting operation is periodically performed on the phase detecting means until it is determined that the phase detection by the phase detecting means is completed. Phase detection end determining means for causing the motor to start driving the electric motor in response to the phase detection end determining means determining that phase detection has been completed; and Until it is determined that the detection is completed, charging control for generating the drive signal such that the charging operation of the charge pump capacitor is performed periodically and during the non-execution of the phase detecting operation by the phase detecting means. And an inverter device. 2. An inverter circuit for driving a motor, comprising an upper arm switching element and a lower arm switching element connected in series between DC power supply lines, an upper arm driving circuit for driving the upper arm switching element, A lower arm drive circuit for driving the lower arm switching element; a lower arm drive power supply for supplying a drive DC voltage to the lower arm drive circuit; and a charge pump capacitor for supplying a drive DC voltage to the upper arm drive circuit An upper-arm drive power supply for charging the charge pump capacitor from the lower-arm drive power supply when the lower-arm switching element is in an on state; and driving the upper-arm drive circuit and the lower-arm drive circuit. Control means for outputting a signal. Rotation speed detection means for detecting the rotation speed of the electric motor before the machine is driven; and periodically detecting operation of the rotation speed detection means until it is determined that the detection of the rotation speed by the rotation speed detection means is completed. A rotation speed detection end determination unit for performing the rotation speed detection; a rotation start detection unit that starts driving the electric motor in response to the rotation speed detection end determination unit determining that the detection of the rotation speed has ended; Until the end determination unit determines that the detection of the rotation speed is completed, the charging operation of the charge pump capacitor is performed periodically and while the rotation speed detection unit is not performing the rotation speed detection operation. And a charge control means for generating the drive signal. 3. An inverter circuit for driving a motor, comprising an upper arm switching element and a lower arm switching element connected in series between DC power supply lines, an upper arm driving circuit for driving the upper arm switching element, A lower arm drive circuit for driving the lower arm switching element; a lower arm drive power supply for supplying a drive DC voltage to the lower arm drive circuit; and a charge pump capacitor for supplying a drive DC voltage to the upper arm drive circuit An upper-arm drive power supply for charging the charge pump capacitor from the lower-arm drive power supply when the lower-arm switching element is in an on state; and driving the upper-arm drive circuit and the lower-arm drive circuit. Control means for outputting a signal. Phase detection means for detecting a phase of a rotor of the electric motor before driving of the motor, rotation speed detection means for detecting a rotation speed of the electric motor at least before driving of the electric motor, and phase detection by the phase detection means. Until it is determined that the rotation has been completed, the phase detection completion determination means for causing the phase detection means to periodically perform a detection operation, and until the rotation speed detection means determines that the rotation speed detection has been completed, A rotation speed detection end determining unit for causing the rotation speed detecting unit to periodically perform a detecting operation; and the phase detection end determining unit determines that the phase detection has been completed, and the rotation speed detection end determining unit detects the rotation speed. Drive start control means for starting driving of the electric motor in response to the determination that the detection has been completed, and that the phase detection has been completed by the phase detection end determination means. The charging operation of the charge pump capacitor is periodically performed until the rotation speed has been detected and the rotation speed detection end determination unit determines that the detection of the rotation speed has been completed. An inverter device comprising: charge control means for generating the drive signal so that the drive signal is generated while the rotation speed detection operation by the speed detection means is not performed. 4. The inverter device according to claim 1, wherein the control means includes phase correction means for correcting the phase of the rotor of the electric motor detected by the phase detection means. 5. The phase detection end determining means determines that the phase detection has been completed when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the phase detection by the phase detecting means ends. The inverter device according to any one of claims 1, 3, and 4, wherein: 6. The inverter device according to claim 2, wherein the control means includes a rotation speed correction means for correcting the rotation speed of the electric motor detected by the rotation speed detection means. 7. The rotation speed detection completion determination means terminates the detection of the rotation speed when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the rotation speed detection by the rotation speed detection means ends. The inverter device according to any one of claims 2, 3, and 6, wherein the inverter device is determined to be one. 8. The control means includes: phase correction means for correcting the phase of the rotor of the electric motor detected by the phase detection means;
4. The inverter device according to claim 3, further comprising: a rotation speed correction unit configured to correct the rotation speed of the electric motor detected by the rotation speed detection unit. 9. The phase detection end determination means determines that the phase detection has been completed when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the phase detection by the phase detection means is completed. The rotation speed detection end determination means determines that the detection of the rotation speed has ended when the number of executions of the charging operation of the charge pump capacitor reaches a predetermined number before the rotation speed detection by the rotation speed detection means ends. The inverter device according to claim 3, wherein: 10. The charge control unit according to claim 1, wherein the charge control unit determines the charge operation time of the charge pump capacitor based on a time interval at which the charge pump capacitor is charged. The inverter device as described. 11. Charging voltage detecting means for detecting a charging voltage of a charge pump capacitor, wherein charging control means determines a charging operation time of the charge pump capacitor based on the charging voltage detected by the charging voltage detecting means. The inverter device according to claim 1, wherein the inverter device is determined. 12. The charge control unit according to claim 1, wherein the drive signal is generated by PWM control.
The inverter device according to any one of the above. 13. The inverter device according to claim 12, wherein the charge control means determines a duty ratio of the drive signal based on a rotation speed of the electric motor. 14. The inverter device according to claim 12, wherein the charging control means determines a PWM frequency of the drive signal based on a rotation speed of the electric motor. 15. The inverter device according to claim 12, wherein the charging control means determines a time width of the drive signal based on a rotation speed of the electric motor. 16. The inverter device according to claim 1, wherein the charging control unit stops performing the detecting operation for a predetermined period after performing the charging operation of the charge pump capacitor.