JPH02264198A - Air flow controlling device - Google Patents

Abstract

PURPOSE:To easily set an optimum air flow according to a type of an air conditioner by controlling rotational speed of a fan motor through comparing a set rotational speed obtained by means of an A/D converter with an actual value obtained by means of a detecting means. CONSTITUTION:When an electric power source 3 is switched on, a controlling unit 10 rotates a fan motor 1 though a photocoupler 2 on the basis of a signal from a zero crossing detecting circuit 12. On the other hand, an electric source for control is switched on by switching-on of the power source 3, and DC voltage Vdd is divided into a high air flow voltage Vh, a medium air flow voltage Vm and a low air flow voltage Vl through each of resistance networks 21 and 22, 23 and 24, 25 and 26. These voltage are converted to 8 bit digital values respectively by means of A/D converters and are used as data of set rotational speed corresponding to set air flow to be selected by using an operating unit 11. Then, these data are compared with actual rotational speed of the fan motor 1 detected by a Hall element 5. Then, the rotational speed of the fan motor 1 is controlled according to the deviation between the set rotational speed and the actual speed Thus, optimum air flow can be set according to a type of an air conditioner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) This invention relates to an air volume control device used in an air conditioner.

(Prior Art) In general, air volume control in an air conditioner is performed by, for example,
The target rotation speed of the fan motor is stored in memory in advance, a voltage setting means is provided for setting a voltage value for specifying the rotation speed, and the set voltage of this voltage setting means is used as an address specification. There is a device that reads a target rotation speed from a fan motor and controls the fan motor so that the read target rotation speed is obtained.

In other words, the optimal air volume can be set without having to prepare and use separate memories for each type of air conditioner.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned air volume control, a memory for storing the target rotational speed is strictly required, and there is a problem in that it leads to an increase in cost.

This invention was made in view of the above circumstances,
The purpose is to make it possible to set the optimal air volume according to the type of air conditioner, without requiring memory to store the target rotation speed, and thereby increasing costs. An object of the present invention is to provide an air volume control device.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a detection means for detecting the number of rotations of a fan motor, a resistor circuit that generates a voltage at a predetermined level based on a voltage division ratio of the resistors, and a resistor circuit that generates a voltage at a predetermined level based on a voltage division ratio of the resistors. an analog/digital conversion means for converting the generated voltage into a several-bit digital signal corresponding to the target rotation speed; and a comparison means for comparing the target rotation speed obtained by the analog/digital conversion means with the detection value of the detection means. , and control means for controlling the rotation speed of the fan motor according to the comparison result of the comparison means.

(Function) The voltage generated by the resistor circuit is converted into a several-bit digital signal corresponding to the target rotation speed, and the target rotation speed is compared with the detected value of the detection means, and the fan motor is rotated according to the comparison result. Control numbers.

(Example) Hereinafter, a first example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a single-phase fan motor consisting of a main winding M and an auxiliary winding A, which drives, for example, an indoor fan of an air conditioner.

The main winding M of this fan motor 1 is connected to the AC power supply 3 via a photothyristor (bidirectional thyristor) 2b of a photocoupler 2, and the auxiliary winding A is connected to the main winding M via a driving capacitor 4. do.

Then, the fan motor 1 is provided with a Hall cable 5. This Hall element 5 magnetically detects the rotation of the fan motor 1 and emits one pulse signal for each rotation of the fan motor 1.

On the other hand, numeral 10 denotes a control section, which is composed of a microcomputer and its peripheral circuits, takes in DC voltage Vdd as an operating voltage, and performs overall control of air volume control.

This control section 1-0 includes an operation section 11 and a zero cross detection circuit 1.
2. Connect the resistor circuit of resistors 21 and 22, the resistor circuit of resistors 23 and 24, and the resistor circuit of resistors 25 and 26. Further, the anode of the photodiode 2a of the four coupler 2 is connected to the control section]0 via the resistor 13, and the cathode of the photodiode 2a is connected to the application terminal of the DC voltage element 1.

Here, the operating section 11 is for performing an operation for setting the air volume, and is incorporated into, for example, an operating section of an air conditioner.

The zero cross detection circuit 12 detects the zero cross point of the voltage of the AC power supply 3.

The resistance circuit of the resistors 21 and 22 takes in the DC voltage Vdd and generates a voltage vh at a level corresponding to the "strong" air volume based on the voltage division ratio of the resistors 21 and 22.

The resistance circuit of the resistors 23 and 24 takes in the DC voltage Vdtl and generates a voltage Vm at a level corresponding to a "weak" air volume based on the voltage division ratio of the resistors 23 and 24.

The resistance circuit of resistors 25 and 26 takes in the DC voltage Vdcl and generates a voltage Vρ at a level corresponding to the "slight" air volume based on the voltage division ratio of the resistors 25 and 26.

The photocoupler 2 triggers the photothyristor 2b by light emission from the four diode 2a.

The control unit 10 includes a detection means for detecting the rotation speed of the fan motor from the output of the Hall element 5 and obtaining rotation speed data corresponding to the detected value, and voltages Vh and V generated by each resistance circuit.
Analog/digital conversion means for converting m and VΩ into several-bit digital signals corresponding to the target rotational speed, and converting one of the digital signals obtained by the analog/digital conversion means according to the air volume setting on the operation unit 11. a selection means for selecting the digital signal selected by the selection means, a calculation means for converting the digital signal selected by the selection means into binary target rotation speed data, and a target rotation speed data obtained by the calculation means (11) and the target rotation speed data obtained by the detection means. A comparison means for comparing the fan motor with the rotation speed data, and a control means for controlling the rotation speed of the fan motor by controlling the energization of the four diode 2a according to the comparison result of the comparison means and the output of the zero cross detection circuit 12. It is equipped with

The main parts of this control section 10 are shown in FIG.

30 is a CPU (central processing unit), and the CPU 30 is equipped with an A/D (analog/digital conversion means).
Analog/digital) conversion section 31゜32.33, RO
M (read only memory) 34, RAM (random access memory) 35, and timer 36 are connected.

The A/D converter 31 inputs an input voltage v corresponding to “strong” air volume.
This converts h into an 8-bit digital signal.

The A/D converter 32 inputs an input voltage V corresponding to “weak” air volume.
This converts rn into an 8-bit digital signal. The A/D converter 33 converts the input voltage VfI corresponding to the "low" air volume into an 8-bit digital signal.

The outputs of these A/D converters 31, 32, and 33 are each taken into CPU10, and are converted into 1
Converted to 1 standard rotation speed data.

The ROM 34 stores a control program for the CPU 30. The RAM 35 is used for storing processing data of the CPU 30, etc. The timer 36 is a photodiode 2a.
Used to determine the timing of energization control.

The operation of the above configuration will be explained with reference to FIG. 4.

First, since the resolution of the A/D converters 31, 32, and 33 is 8 bits, as shown in FIG.
, "Fine"), a maximum of 256 digital signal settings can be made for each.

Then, each digital signal is converted into binary target rotation speed data by the calculation of the CPU 30. This target rotation speed data is 1/1 of the actual rotation speed of the fan motor 1.
This corresponds to a value of 10, which allows the rotation speed of the fan motor to be set in the range of 0 to 2550 (rpm) and 10 (rpm).
pm) steps.

For example, if you use a 4-pole fan motor and have a frequency of 6
When a power supply voltage of 0 Hz is used, the maximum rotational speed of the fan motor is about 1800 (rpm), and it is possible to set the rotational speed sufficiently including this.

On the other hand, when the power supply 3 is turned on, the power supply voltage is applied to the zero cross detection circuit 12, and the zero cross of the power supply voltage is detected.

The CPU 30 starts energizing the four diode 2a after a predetermined time based on 81 o'clock on the timer 36 after the zero cross detection circuit 12 detects the zero cross, and the zero cross detection circuit 12 continues the energization until the next zero cross. Continue until it is detected.

When the photodiode 2a is energized, the four ziristor 2b becomes conductive while the photodiode 2a is energized, and a power supply voltage is applied to the fan motor.

In this way, the fan motor is energized at a predetermined conduction angle every half cycle of the power supply voltage.
The fan motor rotates and blows air.

In addition, when the power supply 3 is turned on, the control power supply is also turned on, and the DC voltage Vdd is divided by each resistor circuit. ” is generated.

These voltages Vl-1, Vm, VΩ are applied to the A/D converter 3.
1, 32, and 33 into digital signals (steps S 1 a, S 1 b, S 1 c).

The CPU 30 selects and reads one of the converted digital signals that corresponds to the air volume setting of one operation unit.
Step S2), the read digital signal is converted into binary target rotation speed data Ns by calculation (Step S2).
3).

In other words, when the air volume is set to "strong" on the operation unit 11, the CP
U30 selects and reads the digital signal converted from the voltage vh, and converts it into target rotation speed data Ns. When the air volume is set to "low" with the operation unit 11, the CPU 30 selects and reads the digital signal converted from the voltage Vm, and converts it into target rotation speed data Ns. When the air volume is set to "fine" using the operation unit 11, the CPU 30 selects and reads the digital signal converted from the voltage VrI, and converts it into date mark rotation speed data Ns.

When the fan motor 1 rotates, a pulse signal is emitted from the Hall cable 5 every time the fan motor 1 rotates.

The CPU 30 detects the rotation period T of the fan motor 1 by receiving the pulse signal from the Hall element 5 (step S4), and calculates rotation speed data corresponding to the rotation speed of the fan motor from the detected rotation period T and the following formula. Calculate Na (step 55) Na = (60/T)
(1/10) Here, 60 is a coefficient for converting the number of revolutions per second to the number of revolutions per minute, and (60/T)
The value of is the number of rotations of the fan motor tacho for one minute. By multiplying this rotation speed by (1/10), correspondence with the target rotation speed data Ns is established.

Then, the CPU 30 compares the target rotation speed data Ns obtained in step S3 with the rotation speed data Na (step S6).

In this comparison, if the rotation speed data Na is smaller than the target rotation speed data Ns, the CPU 30 calculates a predetermined time t from when the zero cross detection circuit 12 starts energizing the photodiode 2a while detecting a zero cross. (step 57a).

When the predetermined time t becomes shorter, the conduction angle of the photothyristor 2b of the photocoupler 2 becomes larger, the time during which the fan motor 1 is energized increases, and the rotation speed of the fan motor 1 increases.

Further, in the above comparison, if the rotation speed data Na is larger than the target rotation speed data Ns, the CPU 30 determines that the predetermined time t from when the zero cross detection circuit 12 detects the zero cross to when the photodiode 2a starts to be energized. (Step 57b) When the predetermined time t becomes longer, the conduction angle of the photothyristor 2b of the photocoupler 2 becomes smaller, and the time during which the fan motor 1 is energized is reduced.
rotation speed decreases.

Further, in the above comparison, when the rotation speed data Na is equal to the target rotation speed data Ns, the CPU 30 does not change the predetermined time t.

In this way, by controlling the rotation speed of the fan motor based also on the target number data Ns, indoor air volumes corresponding to the set air volumes of "strong", "weak", and "slight" are ensured.

In this way, the voltage generated by the resistor circuit is converted into a several-bit digital signal corresponding to the target rotation speed, and the target rotation speed data is used to control the rotation speed of the fan motor 1. It is possible to set the optimal air volume according to the type of air conditioner without requiring a memory to store the target number of eye rolls, and therefore without causing an increase in cost.

Next, regarding the second embodiment of the present invention, FIGS.
This will be explained using figures.

In this embodiment, the resistance circuits connected to the control unit 0 are a resistance circuit with a resistance of 40.41 for "strong" air flow, a resistance circuit of resistance 40.42 for "weak" air flow, and a resistance circuit of resistance 40.42 for "weak" air flow. A resistor circuit having a resistance of 40.43 is adopted, and these resistor circuits are sequentially selected and turned on by the switch circuit 50 of the control section 10].

The switch circuit 50 includes transistors 51, 52, and 53 that control conduction of each resistance circuit.

Further, the control section 10 has only one A/D conversion section 31, and the A/D conversion section 31 for the input terminals Vh, VmVΩ from each resistance circuit
/D conversion processing is performed only by the A/D conversion section 3].

Then, the CPU 30 selectively turns on the transistors 5152 and 53 of the switch circuit 50 in accordance with the air volume setting of the operation unit 11, captures the digital signal of the input voltage corresponding to the air volume setting based on this selection, and converts the captured digital signal is calculated and converted into target rotation speed data.

Other configurations and operations are the same as in the first embodiment.

In this case, in addition to the effects of the first embodiment, there is an advantage that the number of A/D converters is reduced and the configuration is simplified.

In each of the embodiments described above, the number of steps for setting the air volume is three, but the number of steps is not limited and can be set as appropriate.

Also, find the sum of the voltage V h corresponding to the air volume "strong" and the voltage V [11] corresponding to the air volume "weak", and calculate the sum of the sum]/2
By performing A/D conversion on the value of , it is possible to set an air volume that is between "strong" and "weak". Similarly, if we find the difference between the voltage Vm corresponding to the air flow "weak" and the voltage vf! corresponding to the wind m "weak" and convert the value of 1/2 of the sum into A/D, , it is possible to set an air volume between "weak" and "slight" air volume.

Furthermore, although fixed resistances are used in each resistance circuit, variable resistances may also be used.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist. For example, a one-chip microcomputer having a built-in A/D conversion section without providing an external A/D conversion section may be used.

[Effects of the Invention] As described above, according to the present invention, there is provided a detection means for detecting the number of rotations of a fan motor, a resistance circuit that generates a voltage at a predetermined level based on a resistance]5 pressure ratio, and a resistance circuit that generates a voltage at a predetermined level based on the resistance. An analog/digital conversion means for converting the voltage generated by the circuit into a several-bit digital signal corresponding to the target rotation speed, and a comparison for comparing the target rotation speed obtained by the analog/digital conversion means with the detection value of the detection means. and a control means for controlling the rotation speed of the fan motor according to the comparison result of the comparison means, so there is no need for a memory to store the target rotation speed, which increases costs. It is possible to provide an air volume control device that can set an optimal air volume according to the type of air conditioner without causing problems.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the main part of the control section in the same embodiment, and FIG.
The figure shows the relationship between the voltage generated by the resistance circuit and the target rotational speed data and the rotational speed in the same embodiment, FIG. 4 is a flowchart for explaining the operation of the same embodiment, and FIG. 6 is a diagram showing the configuration of the second embodiment, and FIG. 6 is a diagram showing the configuration of the main part of the control section in the same embodiment. ]...Fan motor, 2.Photocoupler, 5.Hall element, 10.Control unit, 21.22.Resistor (
Resistance circuit), 23.24...Resistance (resistance circuit), 25
゜26...Resistance (resistance circuit), 30...CPU, 3
1. . 32.33...A/D conversion section. Applicant's agent: Takehiko Suzue, Vh, Vm,
Vz diagram

Claims (1)

[Claims] A detection means for detecting the rotation speed of the fan motor, a resistance circuit that generates a voltage at a predetermined level based on the voltage division ratio of the resistors, and an analog converter that converts the voltage generated by this resistance circuit into a several-bit digital signal corresponding to the target rotation speed. /Digital conversion means, comparison means for comparing the target rotation speed obtained by the analog/digital conversion means and the detection value of the detection means, and controlling the rotation speed of the fan motor according to the comparison result of the comparison means. What is claimed is: 1. An air volume control device characterized by comprising a control means for controlling