JPS63206185A - Rotation control device of blower - Google Patents

Abstract

PURPOSE:To change amplitude easily, by producing multiple patterns different only in average revolution under the condition where the capacity is low in the section to share the storage function of a revolution setting signal generation section. CONSTITUTION:A rotation control device of a blower is composed of the number of revolutions detecting element 2 of a DC motor 1, a DC power source section 3, a rotation control section 4, a drive section 5, a modulation signal generation section 6 to change the number of revolutions of the motor 1, a revolution setting signal generation section 9, etc. The device controls the number of revolutions of the motor 1. The revolution setting signal generation section 9 is to add, for example, the offset voltage being an average number of revolutions for temporal revolution change pattern obtained by changing the division ratio of a resistance group 13 with the output signal of a microcomputer 10 and the voltage of change portion being an amplitude of this pattern obtained by a D/A converter 11. The capacity of the portion to share the storage function of the abovementioned generation section 9 will do only for the data to make the voltage of change portion, so that it can be reduced to this extent.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a method of rotating a blower that is effective for creating a specific wind speed pattern such as a natural wind by changing the rotation speed of a fan of a blower such as an electric fan or a hot air blower. This relates to a control device.

2. Description of the Related Art Conventionally, a rotation control device for a blower of this type has a configuration as shown in FIG. In FIG. 3, 1 is a DC motor, which is generally equipped with a rotation speed detection element 2 such as a Hall element or a Hall IC. Power for this DC motor 1 is supplied from a DC power supply section 3 that employs a switching method or the like.
The rotation is driven by an output signal from a rotation control unit 4 that generates a time-series firing signal in accordance with the number of poles of the DC motor 1.
This is done by amplifying the power in the drive section 5. The details of the rotational operation of the DC motor 1 are already well known, so the explanation will be omitted. Reference numeral 6 denotes a modulation signal generation section for changing the output voltage of the DC power supply section 3 using output signals having different pulse widths and changing the rotation speed of the DC motor 1. An oscillation section 7 for generating a steady triangular wave signal or a sawtooth wave signal. A pulse width modulation signal is created by comparing the output signal of the reference signal generator 8 with the output signal of the reference signal generator 8 having information for determining the rotation speed of the DC motor 1. Reference numeral 9 denotes a rotation speed setting signal generator whose output voltage can be changed according to a desired rotation speed, and a D/A conversion circuit 11 is often used to convert a digital signal from the microcomputer 1o into an analog signal. Since the modulation signal generator 8 has a control function such that the fixed divided voltage of the output of the DC power supply unit 3 becomes equal to the output signal of the rotation speed setting signal generation unit 9, the rotation speed of the DC motor 1 can be set to an arbitrary value. It can be set to Note that 12 is the DC motor 1
This is a low-voltage power supply section that supplies power to other parts.

Problems to be Solved by the Invention In such a conventional configuration, for example, an attempt is made to blow air in a plurality of patterns having different average rotational speeds in a pattern that changes the rotational speed over time as shown in FIG. case,
The rotation speed setting signal generation section 9 must prepare time-series rotation speed data for all patterns to create each pattern. For example, when using the microcomputer 1o, the capacity of its storage section is limited. The problem was that it became a big thing.

The present invention solves these problems, and is capable of generating a plurality of patterns that differ only in average rotational speed with a small capacity of the portion of the rotational speed setting signal generating section 9 that shares the storage function. Moreover, it is an object of the present invention to provide a rotation control device for a blower that can easily change the amplitude of an operating pattern without changing its average rotation speed.

Means for solving the problem In order to solve this problem, the present invention provides a direct current motor,
a DC power supply unit that supplies power to the DC motor; a rotation control unit that generates a time-series firing signal for rotating the DC motor; and a rotation control unit that receives output signals from the rotation control unit and operates the DC motor. 1; a modulation signal generation section that generates a pulse width modulation signal for changing the output voltage of the DC power supply section; and a rotation speed setting signal generation section that generates a signal that specifies the rotation speed of the DC motor. and a reference signal generating section for changing the pulse width of the modulation signal generating section based on the signal from the rotation speed setting signal generating section and the output signal of the DC power supply section, and generating the rotation speed setting signal. The signal of the section is created by the sum of the offset voltage and the voltage change.

Further, the magnitude of this voltage change can also be changed.

Effect When using this configuration to create multiple temporal rotational speed change patterns with different average rotational speeds, it is best to give the average rotational speed using an offset voltage. The capacitance is reduced because only the data is needed to create the voltage for the change.

Embodiment FIG. 1 is a circuit diagram of a blower rotation control device according to an embodiment of the present invention. Compared to the conventional example shown in FIG. 3, the configuration shown in FIG. 1 is only the rotational speed setting signal generating section 9 that has been improved according to the present invention, so the explanation of the other parts will be omitted. Rotation speed setting signal generation unit 9 according to the present invention
is the offset voltage that is the average rotation speed of the temporal rotation speed change pattern created by changing the division ratio of the resistor group 13 according to the output signal of the microcomputer 10, for example, and D
The voltage changes resulting from the amplitude of this pattern created by the /A converter 11 are added via the diode 14. Further, in order to change the amplitude of the temporal rotation speed change pattern by changing the magnitude of the voltage change, a switch 15 is provided so that the effective voltage applied to the D/A converter can be increased or decreased. In this embodiment, the resistor group 13 that generates the offset voltage and the D/A converter 11 have a common ground side potential. By preparing a low voltage power supply unit 12 that can be lower than the ground side potential of the resistor group 13, it is possible to prevent fluctuations in the average rotational speed of the temporal rotational speed change pattern when changing the voltage by the amount of change, more ideal.

Figure 2 is an explanatory diagram to make the above operation easier to understand, and shows the offset voltage and change voltage necessary to realize the three temporal rotation speed change patterns shown in Figure 4. It is something. The pattern shown in FIG. 4 is obtained by adding the variation voltage V to the offset voltage 01° offset voltage o2 and offset voltage Q3 shown in FIG.

Effects of the Invention As described above, according to the present invention, a plurality of temporal rotation speed change patterns that differ only in average rotation speed can be stored in a rotation speed of a blower that requires less capacity of the portion that performs the storage function of the rotation speed setting signal generation section. A control device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a rotation control device for a blower according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the same operation, FIG. 3 is a circuit configuration diagram of a conventional rotation control device for a blower, and FIG. It is an explanatory diagram of the same operation. DESCRIPTION OF SYMBOLS 1...DC motor, 3...DC power supply unit, 4...Rotation control unit, 6...Drive unit,
6...Modulation signal generation section, 8...Reference signal generation section, 9...Rotation speed setting signal generation section. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Seki (SEC)

Claims (2)

[Claims] (1) A DC motor, a DC power supply unit that supplies power to the DC motor, a rotation control unit that generates a time-series firing signal to rotate the DC motor, and an output signal of the rotation control unit a drive unit that receives the signal and drives the DC motor; a modulation signal generation unit that generates a pulse width modulation signal for changing the output voltage of the DC power supply unit; and a signal that generates a signal that specifies the rotational speed of the DC motor. a reference signal generation section for changing the pulse width of the modulation signal generation section based on the signal from the rotation speed setting signal generation section and the output signal of the DC power supply section; A rotation control device for a blower, wherein a signal of the rotation speed setting signal generating section is generated by the sum of an offset voltage and a voltage change. (2) The rotation control device for a blower according to claim 1, wherein the magnitude of the voltage can be changed by the amount of change in the rotation speed setting signal generating section.