JP2003134883A - Dc fan motor driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional DC fan motor driver, wherein abnormality of a DC fan motor being incapable of being detected in the case of pulse driving the DC fan motor. SOLUTION: This DC fan motor driver is equipped with a fan rotation command signal generating means 100, which generates a fan rotation command signal to indicate whether the rotation of the DC fan motor 140 is necessary, an intermittent drive determining means 110 which generates a fan drive command including a continuous drive period and an intermittent drive period, based on the fan rotation drive command signal, a fan drive circuit 120 which drives the DC fan motor by the pulse voltage based on the fan drive command, and a rotation detecting circuit 130 which detects the rotation state of the DC fan motor. Consequently, this DC fan motor driver can detect abnormality of the DC fan motor, even when the DC fan motor is pulse driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims at noise, air volume adjustment, energy saving, DC fan motor life extension, etc.
The present invention relates to a DC fan motor drive device capable of detecting an abnormality such as locking or forgetting to connect the DC fan motor, disconnection of the power supply line of the DC fan motor, and the like even when the DC fan motor is pulsed (PWM or the like).

[0002]

2. Description of the Related Art A conventional DC fan motor driving device will be described with reference to the drawings. FIG. 2 is a diagram showing a partial configuration of a conventional DC fan motor driving device when two DC fan motors shown in Japanese Patent Application No. 12-093796 are serially driven.

In FIG. 2, 1 is a DC power source for supplying a DC fan motor, which will be described later, with a DC voltage of, for example, 48 V, 2 is a drive circuit for receiving a fan drive command, 3
Is a semiconductor switch driven by the drive circuit 2,
4a and 4b are DC fan motors, and 5 is a voltage balance circuit and a fan abnormality detection circuit for balancing the voltages applied across the DC fan motors 4a and 4b connected in series.

In the figure, when the semiconductor switch 3 is turned on, a DC voltage is applied to the DC fan motors 4a and 4b connected in series. The internal circuits of the voltage balance circuit and the fan abnormality detection circuit 5 will be described later with reference to FIGS. 3 and 4.

Further, Japanese Patent Laid-Open No. 8-107697 discloses a DC fan motor drive device for driving one DC fan motor. The operation principle of the abnormality detection circuit is the same as that shown in FIG.

[0006]

Generally, a commercially available DC fan motor has a lock protection function.
When the lock is detected, the operation is automatically stopped and the self power consumption is reduced. If the lock is released after a few seconds, the DC fan motor will rotate again.

Due to the self-protection function of this DC fan motor, if one of the DC fan motors connected in series locks or forgets to connect, and an abnormality such as a power line disconnection occurs, the abnormality detection circuit operates. What is configured to operate is the abnormality detection circuit of FIGS. 2, 3, and 4 described above. FIG. 3 shows an abnormality detection by detecting a flowing current by operating the voltage balance circuit.
FIG. 4 is for detecting an overvoltage due to an unbalanced voltage, that is, a current which starts to flow by the Zener diode 21a or 21b.

In any of the above abnormality detection circuits,
Unless the semiconductor switch 3 in FIG. 2 is in the ON state, that is, the voltage is not applied to the DC fan motors 4a and 4b, the abnormality cannot be detected. Therefore, when the DC fan motor is driven by a pulse voltage for the purpose of adjusting noise and air volume, saving energy, extending the life of the fan, etc.
Since N / OFF is repeated, the input is turned off before the abnormality is detected through the filter circuit.

Therefore, even if the DC fan motor is locked or forgotten to be connected, or an abnormality such as disconnection of the DC fan motor power line occurs, the abnormality cannot be detected and there is a possibility that the abnormality is left unobserved. Therefore, there is a problem that the reliability of the DC fan motor drive device is reduced.

If the DC fan motor is intermittently operated at an interval shorter than the filter circuit time constant of the abnormality detection circuit, the locked state of the DC fan motor cannot be detected.

The present invention has been made to solve the above-mentioned problems. Even when the DC fan motor is pulse-driven, the DC fan motor is locked or the connection is forgotten.
An object of the present invention is to obtain a DC fan motor drive device capable of detecting an abnormality such as a disconnection of a power supply line of a C fan motor.

[0012]

According to a first aspect of the present invention, there is provided a DC fan motor driving device, which includes fan rotation command signal generating means for generating a fan rotation command signal indicating whether or not the DC fan motor needs to rotate. An intermittent drive determining means for generating a fan drive command including a continuous drive period and an intermittent drive period based on a fan rotation command signal; a fan drive circuit for driving the DC fan motor with a pulse voltage based on the fan drive command; And a rotation detection circuit for detecting the rotation state of the DC fan motor.

In the DC fan motor drive device according to claim 2 of the present invention, the rotation detection circuit suppresses the voltage applied across the DC fan motor to a voltage equal to or lower than the allowable applied voltage of the DC fan motor. And a fan abnormality detection circuit that outputs a fan abnormality signal when an abnormality of the DC fan motor is detected based on the current flowing through the voltage balance circuit.

According to a third aspect of the present invention, in the DC fan motor drive device, the continuous drive period of the fan drive command is
100% of the first period when the fan rotation command signal is received
The duty is a duty, and the intermittent drive period of the fan drive command is a predetermined duty following the 100% duty.

According to a fourth aspect of the present invention, there is provided a DC fan motor driving device, in which a position where the DC fan motor is installed and a car position are separated by a predetermined distance based on the information on the car position of the elevator. If there is a D
The fan drive area determination means for outputting a signal for permitting the continuous drive of the C fan motor, and the condition input means for instructing the intermittent drive determination means for the drive timing based on the signal for permitting the continuous drive are provided. The intermittent drive determination means outputs the fan drive command based on the drive timing from the condition input means after the fan rotation command is input.

According to a fifth aspect of the present invention, the DC fan motor driving device continuously drives the DC fan motor when it detects an operating condition in which the elevator is not used for a predetermined period based on the operating condition information of the elevator. The fan drive necessity determination means for outputting a permission signal, and condition input means for instructing the drive timing to the intermittent drive determination means based on the signal for permitting continuous drive are further provided, and the intermittent drive determination means is provided. After the fan rotation command is input, the fan drive command is output based on the drive timing from the condition input means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. A DC fan motor drive device according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a DC fan motor drive device according to Embodiments 1 to 3 of the present invention. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 100 is a fan rotation command signal generating means, 110 is an intermittent drive judging means, 120 is a fan drive circuit, 130 is a rotation detection circuit, 140 is a DC fan motor, 150 is an elevator car position (information), 1
Reference numeral 60 is a fan drive area determination means, 170 condition input means,
Reference numeral 180 is an elevator operation status (information), and 190 is a fan drive necessity determination means.

FIG. 2 is a diagram showing a specific configuration of the DC fan motor driving device according to the first to third embodiments of the present invention.

In FIG. 2, 1 is a DC power supply for supplying electric power such as DC voltage of 48V, 2 is a drive circuit for receiving a fan drive command, 3 is a semiconductor switch driven by the drive circuit 2, and 4a and 4b are DC. The fan motors 5 are a voltage balance circuit and a fan abnormality detection circuit.

The drive circuit 2 and the semiconductor switch 3 shown in FIG. 2 correspond to the fan drive circuit 120 shown in FIG. The voltage balance circuit and fan abnormality detection circuit 5 of FIG. 2 correspond to the rotation detection circuit 130 shown in FIG. Further, the DC fan motors 4a and 4b in FIG.
It corresponds to the DC fan motor 140 shown in FIG.

FIG. 3 is a diagram showing the configurations of the voltage balance circuit and the fan abnormality detection circuit of the DC fan motor driving device according to the first to third embodiments of the present invention.

FIG. 4 shows the first to the first embodiments of the present invention.
6 is a diagram showing the configuration of another voltage balance circuit and a fan abnormality detection circuit of the DC fan motor drive device according to FIG.

The voltage balance circuit and fan abnormality detection circuit 5 may be composed of the circuit 5A shown in FIG. 3 or the circuit 5B shown in FIG.

In FIG. 3, 6a and 6b are the midpoint voltage a of the DC power supply 1 (48V) when the semiconductor switch 3 is turned on.
Voltage dividing resistors for producing (24V), 7a and 7b are voltage drive type semiconductor elements for compensating for imbalance of voltage applied to the DC fan motors 4a and 4b, N-type MOSFET and P-type MOSFET , 8a, 8b are low resistances for detecting the currents flowing in the MOSFETs 7a, 7b, respectively.
Current is limited and the voltage balancing capability is reduced.

Further, in FIG. 3, 9a and 9b are an NPN transistor 12a and a PNP transistor 1, respectively.
When the voltage drop across the resistors 8a and 8b is equal to or higher than the threshold voltage (about 0.6V), the transistors 12a and 12b are turned on and the limiting resistor 10
A current flows through the photocouplers 11a and 11b through a and 10b.

Further, in FIG. 3, 13 is a power supply for the logic of the abnormality detection circuit, 14 is a pull-up resistor of the photocouplers 11a and 11b connected in a wired OR connection, 15 is a reverse blocking diode, and 16 is a filter capacitor. Reference numeral 17 is a base resistance of the transistor 18, and 19 is a pull-up resistance.

Further, in the voltage balance circuit and fan abnormality detection circuit 5B shown in FIG. 4, resistors 20a and 20b are connected in parallel to the DC fan motors 4a and 4b, respectively, and the resistance value is that of the DC fan motors 4a and 4b. It is set smaller than the impedance and has the function of voltage balance. When the DC fan motors 4a and 4b are unbalanced and an overvoltage is applied to the zener diodes 21a and 21b, a current flows, and the photocouplers 11a and 11b are operated through the limiting resistors 10a and 10b. The power supply 13 to the pull-up resistor 19 are the same as those in FIG. 3 described above.

Next, the operation of the DC fan motor drive device according to the first embodiment will be described with reference to the drawings.

FIG. 5 shows D according to the first embodiment of the present invention.
It is a flowchart which shows operation | movement of the intermittent drive determination means of a C fan motor drive device.

In FIG. 5, P is a flag indicating permission of continuous drive, and when "0", continuous drive is executed and "1".
At the time of, continuous driving is not performed and intermittent driving is performed.

Further, in FIG. 5, T is a counter for counting the duration of continuous driving, and the counter value is "S".
Then, continuous driving is stopped. That is, count time ”
That is, continuous driving is continued for S ″ (= T1).

In FIG. 1, first, the DC fan motor 1
In order to rotate 40, the fan rotation command signal generation means 100 outputs a fan rotation command. Next, when this fan rotation command is transmitted to the intermittent drive determination means 110,
The intermittent drive determination unit 110 determines the drive content of the DC fan motor 140 based on the drive condition by the condition input unit 170, for example, the drive timing or drive method instruction, or the fan abnormality signal from the rotation detection circuit 130, and determines the fan content. Output a drive command (step 200 in FIG. 5)
~ 207). Then, the fan drive circuit 120 drives the DC fan motor 140 with the drive content instructed by the intermittent drive determination means 110.

Further, the rotation detection circuit 130 monitors the rotation status of the DC fan motor 140. Based on the detection result of the rotation detection circuit 130, a fan abnormality signal is used to notify the occurrence of an abnormality, and the intermittent drive determination means 110 outputs a DC signal.
The drive of the fan motor 140 is stopped (steps 200, 230 to 231 in FIG. 5).

Next, the operation of the fan abnormality detection circuit of the DC fan motor driving device according to the first embodiment will be described with reference to the drawings.

FIG. 6 shows a D according to the first embodiment of the present invention.
6 is a timing chart showing an operation of a fan abnormality detection circuit of a C fan motor drive device.

As an example, a case where the DC fan motor 4a is locked and the DC fan motors 4a and 4b are driven will be described.

In FIG. 6, (a) is a fan drive command, which is an L level signal during drive. (B) is the voltage applied to the DC fan motor 4b, (c) is the potential at point c of the fan abnormality detection circuit, (d) is the potential at point d of the fan abnormality detection circuit, and (e) is e of the fan abnormality detection circuit. It is a potential of a point, that is, a fan abnormal signal, which is an H level signal at the time of abnormality.

First, when the DC fan motors 4a and 4b are stopped, the fan drive command is at the H level, as shown in FIG. 6 (a). As shown in FIG. 6 (e),
The fan abnormality signal at point e of the fan abnormality detection circuit also indicates normality at the L level.

Next, the elevator control circuit (CPU)
When the fan drive command (L level) is sent from the intermittent drive determination means 110 to the drive circuit 2 of FIG. 2, the semiconductor switch 3 is turned on and the voltage is applied to the DC fan motors 4a and 4b.

If the DC fan motor 4a is in the locked state, a large starting current will momentarily occur in the DC fan motor 4a.
a, the impedance of the DC fan motor 4a becomes smaller than the impedance of the other DC fan motor 4b, and due to the partial pressure, the impedance of the point b shown in FIG. The potential will be higher than 24V.

On the other hand, point a shown in FIG. 3 is the voltage dividing resistors 6a, 6
It is kept at half of the DC power supply 1 by b, and is constant at 24V. Now, the potential difference between the points a and b is the MOSFET 7
When the voltage exceeds the threshold voltage of b (about 2V), the voltage balance circuit operates so that the potential difference between the points a and b does not exceed the above threshold voltage because the MOSFET 7b is turned on and current flows. Become.

Further, the MOSFET 7b shown in FIG. 3 is turned on.
By doing so, the transistor 12b operates, a current also flows through the photocoupler 11b, and the potential at point c, which was at the H level until then, becomes the L level.

Next, the locked DC fan motor 4a
When a large start-up current flows, the internal protection circuit recognizes the abnormality, and this time, it starts to operate to limit the current.

As a result, the impedance of the DC fan motor 4a becomes equivalent to that of the DC fan motor 4a.
It becomes larger than b, and the potential at the point b becomes smaller than 24V. As a result, this time, the MOSFET 7a and the transistor 12a are turned on, so that a current flows through the photocoupler 11a. As a result, the potential at the point c momentarily becomes H level but is kept at L level.

Therefore, the potential at the point d, which was kept at the H level until then, is reduced by the discharge time constant determined by the capacitor 16, the resistor 17, and the base-emitter resistance of the transistor 18, and the transistor 18 is kept ON. When it is lowered to such an extent that it cannot be operated, the transistor 18 is turned off, and FIG.
As shown in (e), the fan abnormality signal at point e changes to H level. Thereby, the failure of the DC fan motor 4a is detected.

Here, when the operation time from the change of the fan drive command of the DC fan motor to the L level to the change of the fan abnormality signal at the point e to the H level is T2, the operation time is earlier than this operation time T2. When the fan drive command is stopped (H level), the fan abnormality signal at point e does not change to H level. That is, even if the DC fan motor 4a has an abnormality such as a lock, it cannot be detected. The operation time T2 is determined by the discharge time constant.

When it is desired to pulse drive the DC fan motor for the purpose of noise, air volume adjustment, energy saving, extending the life of the DC fan motor, etc., the fan drive command repeats the H / L level, so the operation of the transistor 18 is performed. The potential at point d does not drop to the level, and the fan abnormality signal at point e does not change to H level.

In addition, DC is performed at a cycle longer than the operating time T2.
Abnormalities can be detected by pulse-driving the fan motor, but since the fan pulsates and rotates, pulse-driving is meaningless and not practical.

In the first embodiment, as shown in FIG. 6 (a), the fan drive command is continued at the T1 and L levels for a time sufficiently longer than the operation time T2 at the beginning of each drive of the DC fan motor. The signal having a desired pulse duty is obtained after time T1.

Thus, even if the DC fan motor is locked, the connection is forgotten, or the DC fan power supply line is disconnected, an abnormality can be detected every time it is started. The rotation detection circuit (voltage balance circuit or the like) 1 is made to be recognized by the intermittent drive determination means 110 or the like in the control circuit (CPU) of the elevator that the fan abnormality signal has continued for a predetermined time, and the semiconductor switch 3 is turned off.
It is possible to easily disconnect the DC power supply 1 before damaging the DC fan motor 140 or the DC fan motor 140, and to provide a highly reliable DC.
A fan motor drive device can be provided.

In the circuit configuration of FIG. 4, the photocoupler 11 is affected by the overvoltage generated by the voltage imbalance.
Although there is a difference in the operation of a and 11b, the operation of the fan abnormality detection circuit in the subsequent stage is the same as that described in FIG.

In the DC fan motor drive device according to the first embodiment, when the DC fan motor 140 is driven by applying a pulse voltage for the purpose of noise reduction and air volume adjustment, the fan drive command is output for each drive. First 100
After outputting the duty (% voltage applied state) for the time T1, the duty is switched to a desired value.

When the DC fan motor 140 has an abnormality such as a lock or disconnection, the abnormality can be surely detected. Further, since the DC fan motor 140 is driven at 100% duty only for a predetermined time in the initial stage of rotation, problems such as noise can be minimized.

Embodiment 2. A DC fan motor drive device according to Embodiment 2 of the present invention will be described with reference to the drawings.

In the second embodiment, the elevator control circuit (CPU) constantly recognizes the position of the elevator car.
The fan drive command of the above-described first embodiment is applied only when the C fan motor is separated by a certain distance or more from the mounted position.

The motor for raising and lowering the elevator car is controlled at a variable speed by an inverter device, and a cooling fan for cooling the inverter device is housed in a control panel (elevator control circuit) together with the inverter device. In recent years, machine room-less elevators that do not require a machine room have become the mainstream in the industry, and the control panel is installed in the hoistway.Therefore, the number of cases where the rotation noise of the reject fan becomes a problem inside the car or at the landing is increasing. ing.

Basically, the inverter device generates heat because
The elevator is only running, and the cooling fan is driven only during that time, but when the car position is far from the control panel mounting position as in the second embodiment (for example, a floor separated from the control panel). If the fan drive command is set to 100% duty only for the first time T1 and then driven at a desired duty only at the time of starting), noise inside the car can be reduced at least.

As long as the car is a predetermined distance from the installation position of the DC fan motor, it is not the beginning of fan drive,
A 100% duty interval may be provided in the middle of time T1 (T2 or more).

By using the fan drive command as described above, it is possible to check the abnormality of the DC fan motor almost every time the elevator is started, the problem of noise in the car is solved, and the DC fan motor is driven. The reliability of the device can be increased.

Next, the detailed operation of the DC fan motor driving device according to the second embodiment will be described with reference to FIGS. 1 and 5.

Referring to FIG. 1, in the elevator control panel, the fan drive area determination means 160 determines DC in the hoistway from information (data) 150 on the elevator car position.
Only when the position where the fan motor 140 is installed and the car of the elevator are sufficiently distant from each other, a signal that permits continuous driving is output to the condition input unit 170.

Next, after inputting the fan rotation command, the intermittent drive determining means 110 is based on the drive condition by the condition input means 170, for example, the instruction of the drive timing or the drive method, that is, the signal for permitting the above continuous drive. And outputs a fan drive command (steps 200 to 201 in FIG. 5,
220-222, 202-207). Then, the fan drive circuit 120 drives the DC fan motor 140 with the drive content instructed by the intermittent drive determination means 110.

The DC fan motor drive device according to the second embodiment is applied to drive a DC fan motor by applying a pulse voltage for the purpose of noise reduction and air volume adjustment.
Only when the elevator car is located a predetermined distance away from the position where the DC fan motor 140 is mounted (for example, a control panel incorporating an inverter), the fan drive command is first issued. After outputting a 100% duty (a state in which all voltages are applied) for a time T1, the duty is switched to a desired duty. In addition to the above cases, a fan drive command with a desired duty is applied from the beginning.

D by the first 100% duty drive
When the noise inside the car becomes a problem due to the high rotation of the C fan motor 140, the noise inside the car can be reduced.

Third Embodiment A DC fan motor drive device according to Embodiment 3 of the present invention will be described with reference to the drawings.

In the third embodiment, the abnormality of the DC fan motor 140 is checked only when the elevator is automatically turned off, that is, when the passenger is not in the car and a predetermined time has passed without being used. A 100% duty fan drive command is output for time T1 (T2 or more). During normal traveling of the elevator, the DC fan motor 140 is driven with a desired duty from the beginning.

As described above, the problem of noise in the car and the hall can be completely solved. However, since the number of times the DC fan motor 140 is checked for abnormalities is reduced, the reliability is slightly inferior to the first and second embodiments, but it is an effective means when it is desired to emphasize noise countermeasures.

Next, the detailed operation of the DC fan motor drive device according to the third embodiment will be described with reference to FIGS. 1 and 5.

In FIG. 1, in the elevator control panel, the fan drive necessity determination means 190 only detects from the elevator operation status information 180 that the elevator is not used for a predetermined period of time, such as when the elevator is not used. Condition input means 170 outputs a signal for permitting continuous driving.
Output to.

Next, the intermittent drive judging means 110, after inputting the fan rotation command, is based on the drive condition by the condition input means 170, for example, the instruction of the drive timing or the drive method, that is, the signal for permitting the above continuous drive. And outputs a fan drive command (steps 200 to 201 in FIG. 5,
220-222, 202-207). Then, the fan drive circuit 120 drives the DC fan motor 140 with the drive content instructed by the intermittent drive determination means 110.

As an example, D
The continuous drive of the C fan motor 140 is executed, and the presence / absence of abnormality of the DC fan motor 140 is detected by the rotation detection circuit 130 by the continuous drive operation.

When the elevator is operated at a high operating rate, the cooling effect of the fan can be increased by operating the DC fan motor 140 in the continuous operation mode.

The DC fan motor drive apparatus according to the third embodiment is applied to drive a DC fan motor by applying a pulse voltage for the purpose of noise reduction and air volume adjustment.
During normal service, a fan drive command with a desired duty is applied from the beginning for each drive, and only when the elevator is automatically turned off, that is, when there are no passengers in the car, DC
10 for checking the abnormality of the fan motor 140
A fan drive command with 0% duty is output for a predetermined time.

When the elevator is not used at all, D
In order to check the abnormality of the C fan motor 140, that is, the DC fan motor 140 is checked when the elevator is not in operation and there is no passenger, a complete noise countermeasure is provided.

[0076]

As described above, the DC fan motor driving device according to the first aspect of the present invention includes fan rotation command signal generating means for generating a fan rotation command signal indicating whether or not the DC fan motor needs to rotate. An intermittent drive determining means for generating a fan drive command including a continuous drive period and an intermittent drive period based on the fan rotation command signal; and a fan drive circuit for driving the DC fan motor with a pulse voltage based on the fan drive command. Since the rotation detection circuit for detecting the rotation state of the DC fan motor is provided,
Even when the C fan motor is pulse-driven, it is possible to detect an abnormality in the DC fan motor.

As described above, in the DC fan motor drive device according to the second aspect of the present invention, the rotation detection circuit sets the voltage applied to both ends of the DC fan motor to the allowable applied voltage of the DC fan motor or less. When the DC fan motor is pulse-driven, since it has a voltage balance circuit that suppresses the above and a fan abnormality detection circuit that outputs a fan abnormality signal when the abnormality of the DC fan motor is detected based on the current flowing in the voltage balance circuit. But DC
It is possible to detect an abnormality in the fan motor.

As described above, in the DC fan motor drive device according to the third aspect of the present invention, the continuous drive period of the fan drive command is set to 100% duty of the first period when the fan rotation command signal is received, Since the intermittent drive period of the fan drive command is set to a predetermined duty following the 100% duty, it is possible to detect an abnormality in the DC fan motor even when the DC fan motor is pulse-driven.

As described above, the DC fan motor drive device according to the fourth aspect of the present invention determines a predetermined distance between the position where the DC fan motor is installed and the car position based on the information about the car position of the elevator. When the distance is distant from the DC fan motor, a fan drive area determination unit that outputs a signal that permits continuous driving of the DC fan motor, and a drive timing to the intermittent drive determination unit based on the signal that permits continuous driving Since the intermittent drive determination means outputs the fan drive command based on the drive timing from the condition input means after the fan rotation command is input, the intermittent drive determination means outputs the fan drive command. In addition to being able to check for abnormalities, the problem of noise inside the car can be solved, and the DC fan motor drive device An effect that it is possible to increase the dependability.

As described above, the DC fan motor driving device according to the fifth aspect of the present invention, when the elevator detects an operating condition in which the elevator is not used for a predetermined period of time, based on the operating condition information of the elevator, the DC fan motor drive device. The intermittent drive further comprises: a fan drive necessity determination means for outputting a signal for permitting continuous drive of the motor; and a condition input means for instructing the intermittent drive determination means of drive timing based on the signal for permitting continuous drive. Since the drive determination means outputs the fan drive instruction based on the drive timing from the condition input means after the fan rotation instruction is input, it is possible to completely eliminate noise.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a DC fan motor drive device according to first to third embodiments of the present invention.

FIG. 2 is a diagram showing a configuration of a fan drive circuit and a rotation detection circuit of a DC fan motor drive device according to the first to third embodiments of the present invention and in the related art.

FIG. 3 is a diagram showing configurations of a voltage balance circuit and a fan abnormality detection circuit of a rotation detection circuit of a DC fan motor driving device according to the first to third embodiments of the present invention and in the related art.

FIG. 4 is a diagram showing configurations of another voltage balance circuit and a fan abnormality detection circuit of the rotation detection circuit of the DC fan motor driving device according to the first to third embodiments of the present invention and in the related art.

FIG. 5 is a flowchart showing an operation of the DC fan motor drive device according to the first to third embodiments of the present invention.

FIG. 6 is a timing chart showing an operation of the DC fan motor driving device according to the first to third embodiments of the present invention.

[Explanation of symbols]

1 DC power supply, 2 drive circuit, 3 semiconductor switch, 4a, 4b DC fan motor, 5, 5A, 5B
Voltage balance circuit and fan abnormality detection circuit, 100 fan rotation command signal generation means, 110 intermittent drive determination means, 120 fan drive circuit, 130 rotation detection circuit,
140 DC fan motor, 150 elevator car position (information), 160 fan drive area determination means, 17
0 condition input means, 180 elevator operation status (information), 190 fan drive necessity determination means.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3F002 CA03 GA02 GA08                 5H571 AA09 AA10 BB04 BB07 CC02                       EE01 FF07 GG07 HA08 HA09                       HA16 HB01 HC02 HD02 JJ03                       JJ13 JJ18 KK05 KK08 LL02                       LL22 LL23 LL33 LL43 LL44                       PP04                 5H572 AA09 AA10 BB04 BB07 CC02                       DD07 EE03 EE08 GG07 HA08                       HA09 HB12 HC02 HC05 HC08                       JJ03 JJ13 KK04 LL02 LL22                       LL24 LL33 LL46 LL47 PP03

Claims (5)

[Claims] 1. A fan rotation command signal generating means for generating a fan rotation command signal indicating whether or not a DC fan motor needs to rotate, and a fan drive command including a continuous drive period and an intermittent drive period based on the fan rotation command signal. Intermittent drive determination means for generating the DC voltage, and the DC voltage based on the pulse voltage based on the fan drive command.
A DC fan motor drive device comprising: a fan drive circuit that drives a fan motor; and a rotation detection circuit that detects a rotation state of the DC fan motor. 2. The rotation detection circuit applies the voltage applied across the DC fan motor to the D
A voltage balance circuit that suppresses the voltage to be lower than the allowable applied voltage of the C fan motor, and the DC based on the current that flows in the voltage balance circuit.
The DC fan motor drive device according to claim 1, further comprising a fan abnormality detection circuit that outputs a fan abnormality signal when an abnormality of the fan motor is detected. 3. The continuous drive period of the fan drive command is:
100% of the first period when the fan rotation command signal is received
3. The DC fan motor drive device according to claim 1, wherein the DC fan motor drive device is a duty, and the intermittent drive period of the fan drive command is a predetermined duty following the 100% duty. 4. When the distance between the position where the DC fan motor is installed and the position of the car is a predetermined distance based on the information of the position of the car of the elevator, the D
Further comprising a fan drive area determination means for outputting a signal for permitting continuous drive of the C fan motor, and a condition input means for instructing the intermittent drive determination means of drive timing based on the signal for permitting continuous drive. 4. The DC fan motor according to claim 1, 2 or 3, wherein the intermittent drive determination means outputs the fan drive command based on the drive timing from the condition input means after inputting the fan rotation command. Drive. 5. A fan drive necessity determination means for outputting a signal for permitting continuous drive of the DC fan motor, when the elevator detects an operation state in which the elevator is not used for a predetermined period based on the operation state information of the elevator. Further comprising: a condition input means for instructing a drive timing to the intermittent drive determination means based on a signal for permitting the continuous drive, wherein the intermittent drive determination means inputs the fan rotation command and then the condition input means. The DC fan motor drive device according to claim 1, 2 or 3, wherein the fan drive command is output based on a drive timing from.