JP2005020821A - Fan motor control arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan motor control arrangement capable of precisely controlling the current value of a fan motor without affected by the error caused by variation in characteristics of the fan motor itself. <P>SOLUTION: When a correction value storing command signal is received through a receiving means 10a of a high voltage part 1a, the specific fan motor current whose value is known is supplied to a fan motor FM from a known current supply means 9. If the correction value storing command signal is received through the receiving means 10b of a low voltage part 1b, a control means 2 compares an AD input value from a current detecting means 6 to a logical output voltage stored in an EEPROM8 to acquire a correction data which is stored in the EEPROM8. The control means 2 controls the fan motor FM based on the calibrated voltage data acquired by taking the correction data into account. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fan motor control device that performs drive control of a fan motor used for ventilation of a combustion device, and more particularly to a technique for controlling a fan motor current supplied to the fan motor with high accuracy.
[0002]
[Prior art]
For example, in a DC fan motor control method, a fan motor control instruction signal is transmitted from a microcomputer to a fan motor control circuit, and a voltage corresponding to the instruction signal is applied to the fan motor. At that time, the current flowing through the fan motor is configured such that a signal converted into a voltage by the current detection unit is fed back to the fan motor control circuit in hardware, and a constant current flows (for example, Patent Document 1). reference.).
[0003]
[Patent Document 1]
JP-A-8-266080 [0004]
In addition, when an instruction signal from the microcomputer for controlling the fan motor is transmitted to the control circuit, a fan motor current that is far from the theoretical value stored in the microcomputer may flow due to element variation of the control circuit. Therefore, the fan motor current is corrected in order to absorb variations in the elements of the control circuit. Since this correction is performed during the manufacturing process of the controller equipped with the control circuit, a pseudo resistor is connected instead of the actual fan motor.
[0005]
When the microcomputer receives a command to enter the fan motor current correction mode from an external indicating device such as a personal computer, the microcomputer outputs a specified instruction signal, and the current value flowing through the pseudo resistance at that time is measured with an externally installed measuring instrument. taking measurement. The value is returned to the microcomputer, and the difference from the theoretical value already stored in the microcomputer is stored in the EEPROM as a correction value. By performing this operation with the minimum and maximum values of the microcomputer instruction signal in the fan motor control range, a relational expression is obtained, and fan motor control is performed based on this expression.
[0006]
Also, the fan motor abnormality is detected from the rotational speed of the fan motor, and when the detected rotational speed of the fan motor exceeds the rotational speed determined as the normal range, the rotational speed abnormality is determined and notified. It has become.
[0007]
[Problems to be solved by the invention]
As described above, in the conventional fan motor control, a resistor is used as a substitute for the fan motor for correction. However, this method does not take into account variations in the current value due to variations in the characteristics of the fan motor itself. The current value flowing through the actual fan motor does not match the correction value, and the accuracy of fan motor control is reduced.
[0008]
Further, the current detected by the fan motor current detection unit is fed back only to the fan motor control circuit, and the microcomputer does not grasp the current value. Therefore, there is a problem that the fan motor cannot be stopped even if an overcurrent flows.
[0009]
The present invention has been proposed in view of the above, and enables high-precision control of the fan motor current value without being affected by errors caused by variations in the characteristics of the fan motor itself, and also enables accurate abnormal fan motor current. The purpose is to detect.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 is directed to a current detection means (6) for detecting a fan motor current supplied to the fan motor (FM) and an analog output voltage of the current detection means. A fan motor control device (1) having a control means (2) for converting this into digital data and performing various fan motor controls, when a specific fan motor current is given to the current detection means First non-volatile storage means (for example, EEPROM 8) for storing a theoretical output voltage to be obtained as an output of the current detection means, and second non-volatile storage means (for example, an electrically writable storage area) For example, when the control means receives a correction value storage command signal issued by a correction value storage command signal generation means that can be arbitrarily operated, the current detection means is provided. The correction data is obtained by comparing the actual output voltage appearing at the output of the current detection means when the specific fan motor current is supplied to the theoretical output voltage stored in the first nonvolatile storage means. The correction data is stored in the storage area of the second nonvolatile storage means, and when the fan motor is controlled, the second nonvolatile memory is used with respect to the actual output voltage obtained as the output of the current detection means. Calibration voltage data is obtained by adding the correction data stored in the characteristic storage means, and the fan motor is controlled based on the calibration voltage data.
[0011]
According to a second aspect of the present invention, in the fan motor control device according to the first aspect, the detection of the current detection means when an abnormal fan motor current serving as a reference for determining the abnormality of the fan motor current flows. The value is stored in advance in the second nonvolatile storage means, and the control means performs the fan motor control based on the calibration voltage data, and the fan motor current actually detected by the current detection means is The fan motor control is stopped when the current value is equal to or higher than the abnormal fan motor current value stored in the second nonvolatile storage means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a schematic configuration of a fan motor control device of the present invention.
[0013]
The fan motor control device 1 includes a high voltage unit 1a and a low voltage unit 1b. Since the high voltage unit 1a and the low voltage unit 1b are separated from each other by a GND line, the fan motor control device 1 is used to drive the fan motor FM. The PWM signal from the control means 2 is transmitted to the switch driving means 3 by the first photocoupler PC1, and the SW drive means 3 that receives this PWM signal and the SW unit 4 are operated by the signal, thereby commercial AC. It is configured to control on / off of a DC 140 V power source generated from the power source and to apply an arbitrary AC voltage to the fan motor FM.
[0014]
The fan motor current supplied to the fan motor FM as described above flows through the current detection resistor 5, and the voltage is amplified by the current detection means 6. In order to transmit the voltage amplified by the current detecting means 6 from the high voltage unit 1a to the low voltage unit 1b, the ON duty is changed to a pulse waveform and transmitted through the second photocoupler PC2. In the low voltage unit 1b, The signal is sufficiently integrated and used as an AD input to the control means 2.
[0015]
The rotational speed of the fan motor FM is detected by the rotational speed detection means 7, and this rotational speed is supplied to the control means 2 via the third photocoupler PC3. Thus, the rotation speed input to the control means 2 is used for the well-known existing fan motor control method. Note that the control means 2 of the low-pressure unit 1b also performs control such as forced stop of the fan motor due to an abnormality in the rotational speed of the fan motor FM.
[0016]
Control information such as a PWM signal output from the control means 2 to the SW drive means 3 in accordance with an output voltage for fan motor control is stored in an EEPROM 8 which is an electrically writable nonvolatile storage means. The control means 2 reads out necessary control data from the EEPROM 8 and writes data into the EEPROM 8 as necessary. In other words, in the present embodiment, the EEPROM 8 is “a first non-volatile memory that stores a theoretical output voltage to be obtained as an output of the current detection means 6 when a specific fan motor current is applied to the current detection means 6. Means "and" second non-volatile storage means having an electrically writable storage area ".
[0017]
As described above, when only the detection current signal is transmitted to the control means 2 by the second photocoupler PC2, the control means 2 is caused by the constant variation of the current detection means 6 and the current transmission ratio of the second photocoupler PC2. The recognition value of is not constant. In order to absorb these variations, if a known current is supplied to the fan motor FM and the AD input value received by the control means 2 at that time is compared with the theoretical output voltage stored in the EEPROM 8, the detection by the current detection means 6 is detected. The error between the value and the actual value can be corrected.
[0018]
Therefore, in the fan motor control device 1 according to the present embodiment, the known current supply unit 9 is provided in the high voltage unit 1a, and a current having a known value is supplied to the fan motor FM, which can be detected by the current detection unit 6. I did it. That is, when a specific fan motor current is given to the current detection means 6 from the known current supply means 9, the actual output voltage appearing at the output of the current detection means 6 and the theoretical output voltage stored in the EEPROM 8 If the correction data is stored in the storage area of the EEPROM 8, the actual actual data obtained as the output of the current detection means 6 at the time of fan motor control performed by the control means 2 is obtained. Calibration voltage data can be obtained by adding the correction data stored in the EEPROM 8 to the output voltage, and the fan motor can be controlled based on the calibration voltage data.
[0019]
The method for starting the correction value storing operation for acquiring the correction data is not particularly limited, but in the present embodiment, it functions as a correction value storing command signal generating means that can be arbitrarily operated. The correction value storage command signal is transmitted to the fan motor control device 1 when the user operates the remote control.
[0020]
Then, the correction value storage command signal from the remote controller is received by the receiving unit 10a of the high voltage unit 1a and the receiving unit 10b of the low voltage unit 1b, respectively, and the known current supply unit 9 supplies a specific fan motor current to the fan motor FM, The control means 2 compares the AD input value from the current detection means 6 with the logic output voltage stored in the EEPROM 8 to obtain correction data, and stores it in the EEPROM 8. The correction value storage command signal uttering means is not limited to a command issued from the outside with a remote controller, but may be a device that issues a correction value storage command signal when a switch provided in the fan motor control device 1 is operated. Further, the known current supply means 9 is not limited to being provided in the fan motor control device 1, and an external power source may be connected when the correction value storing operation is performed.
[0021]
Further, when the known current supply means 9 changes the fan motor current value, and the control means 2 obtains correction data for each current value and stores it in the EEPROM 8, the high-precision fan motor current and the AD input value are calculated. A correction relational expression can be acquired, and by performing feedback control so that the fan motor current value becomes a target current value based on this correction relational expression, not only the variation of the fan motor FM but also the constant variation of the current detection means 6 can be obtained. In addition, the fan motor can be controlled with extremely high accuracy without being affected by variations in the current transmission ratio of the second photocoupler PC2. Even when correction data obtained when a specific fan motor current is supplied, high-precision fan motor control can be performed within a certain current range.
[0022]
Further, the EEPROM 8 stores in advance the detection value (AD input value) of the current detection means 6 when an abnormal fan motor current serving as a reference for determining abnormality of the fan motor current is caused to flow by the known current supply means 9. In addition, when the control means 2 performs the fan motor control based on the correction data or the correction relational expression, the fan motor current actually detected by the current detection means 6 is an abnormality stored in the EEPROM 8. When the current is equal to or greater than the fan motor current value, the control unit 2 stops the PWM motor signal output and stops the fan motor control.
[0023]
As described above, the control means 2 determines the abnormality of the fan motor current by using the detection value that the current detection means 6 actually detects when the current corresponding to the abnormal fan motor current value flows to the fan motor. It is possible to accurately determine the state of overcurrent flowing through the motor, and to stop the fan motor operation before the fan motor fails. In addition, as control of the fan motor control apparatus 1 when the abnormality of the fan motor current is determined, not only the fan motor FM is stopped, but also an appropriate alarm display or an abnormality is notified by sound output. good. Further, an abnormality notification signal may be transmitted to the external device so that the abnormality notification is performed by the external device.
[0024]
【The invention's effect】
As described above, according to the fan motor control device according to claim 1 of the present application, when a specific fan motor current is given to the current detection means, the theoretical output voltage to be obtained as the output of the current detection means is the first. The non-volatile storage means stores the actual output voltage that appears in the output of the current detection means when the control means receiving the correction value storage command signal gives the specific fan motor current to the current detection means. And the theoretical output voltage stored in the first non-volatile storage means to obtain correction data, store the correction data in the storage area of the second non-volatile storage means, and control the fan motor At this time, the calibration voltage data is obtained by adding the correction data stored in the second nonvolatile storage means to the actual output voltage obtained as the output of the current detection means. Seeking data, since the control of the fan motor based on the calibration voltage data, there is no error due to the variation of the fan motor and current detection means, it is possible to perform extremely high precision of the fan motor control.
[0025]
According to the fan motor control device of the second aspect, the detection value of the current detection means when the abnormal fan motor current flows is stored in advance in the second nonvolatile storage means, and is based on the calibration voltage data. When the fan motor control is performed, if the fan motor current actually detected by the current detection means is greater than or equal to the abnormal fan motor current value stored in the second nonvolatile storage means, the control means Since the fan motor control is stopped, it is possible to effectively prevent the fan motor itself from being damaged by an overcurrent.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a fan motor control device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fan motor control apparatus 2 Control means 6 Current detection means 8 EEPROM
FM fan motor

Claims (2)

A fan having current detection means for detecting a fan motor current supplied to the fan motor, and control means for receiving the analog output voltage of the current detection means and converting it into digital data to perform various fan motor controls A motor control device,
A first nonvolatile storage means for storing a theoretical output voltage to be obtained as an output of the current detection means when a specific fan motor current is given to the current detection means;
Second non-volatile storage means having an electrically writable storage area;
With
The control means includes
When the correction value storage command signal generated by the arbitrarily operable correction value storage command signal generating means is received, the actual output appearing in the output of the current detection means when the specific fan motor current is supplied to the current detection means The correction data is obtained by comparing the voltage with the theoretical output voltage stored in the first non-volatile storage means, the correction data is stored in the storage area of the second non-volatile storage means, and the fan motor At the time of control, calibration voltage data is obtained by adding the correction data stored in the second non-volatile storage means to the actual output voltage obtained as the output of the current detection means, and the calibration voltage data is obtained. A fan motor control device configured to control a fan motor based on voltage data. In the fan motor control device according to claim 1,
The detection value of the current detection means when an abnormal fan motor current that is a reference for determining an abnormality of the fan motor current flows is stored in advance in the second nonvolatile storage means,
When the control means performs fan motor control based on the calibration voltage data, the fan motor current actually detected by the current detection means is an abnormal fan motor current stored in the second nonvolatile storage means. A fan motor control device characterized in that the fan motor control is stopped when the value is equal to or greater than the value.

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