JPH0651850A - Controller for electric equipment - Google Patents

Abstract

PURPOSE:To improve functions by improving the resolution of output control, decreasing faults outputted to the outside or facilitating output correction or the like. CONSTITUTION:Phase control is performs by generating a gate signal from a microcomputer 42 as the control signal of a TRIAC 44 for controlling the phase of a heater 1. When the energy consumption of the heater 1 is middle and timing to output the gate signal is close to the peak of a power supply voltage, the gate signal for phase control is delayed and outputted from the microcomputer 42. Thus, the faults outputted to the outside are reduced since the power supply voltage is not turned on near the peak.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for electric equipment such as a dryer.

[0002]

2. Description of the Related Art As an electric device, for example, a dryer uses phase control to vary the power consumption of a heater. Then, in order to improve the functionality of the dryer, various controls are performed by a microcomputer, and a phase control signal that varies the power consumption of the heater is also generated by the microcomputer, and the control signal from this microcomputer causes a control element such as a triac. Are in control.

[0003]

In such a conventional example, the microcomputer can control the output timing (phase angle) of the control signal with high accuracy, but the resolution is poor, so that the microcomputer can control only about 100 W each. Further, when the power consumption of the heater of the dryer is high or low, there are few obstacles (for example, radio wave disturbances) to be output to the outside. However, when the power consumption is medium (when the phase is controlled near the peak of the voltage), there is a problem that the number of failures to be output to the outside increases.

The present invention has been provided in view of the above-mentioned points, and it is possible to improve the resolution of output control, reduce obstacles to the outside, facilitate the correction of output, etc., and achieve high functionality. A control device for an intended electric device is provided.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to an electric device for phase-controlling a control element inserted between an AC power supply and a load, and at a specific timing of the AC power supply to be controlled,
A control means for varying the output timing of the control signal of the control element is provided. In the second aspect, the control signal is not output in the vicinity of the peak of the power supply voltage to be controlled and is delayed from the vicinity of the peak.

In the third aspect of the present invention, the control signal is not output near the peak of the power supply voltage to be controlled, and the output is set to a preset value by advancing or delaying from the peak vicinity. Further, in claim 4, the control signal is output once every several cycles for power supply voltage correction.

According to the present invention, the control signal is output once every several cycles for output correction.

[0008]

Thus, both advantages of the phase control and the zero-cross control can be provided as compared with the method of controlling with the same phase control timing. In the second aspect, since the control signal is not output near the peak of the power supply voltage to be controlled and is delayed from the vicinity of the peak, the phase control near the peak of the power supply voltage is not performed, so that the obstacle to the outside is reduced. It is possible to increase the number of power control variable stages.

In the third aspect of the present invention, the control signal is not output near the peak of the power supply voltage to be controlled, and the output is set to a preset value by advancing or delaying from the peak. Since the phase control in the vicinity of the peak of the power supply voltage is not performed, it is possible to reduce the disturbance to the outside and increase the number of variable stages of power control.

Further, in the present invention, the control signal is output once every several cycles for correcting the power supply voltage. For example, by using a microcomputer as the control means, the control can be changed by the phase control. The number of steps can be increased. Further, in claim 5, the control signal is output once every several cycles for output correction.
For example, by using a microcomputer as the control means, it is possible to increase the number of variable stages of control by phase control.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a case where a dryer is used as an example of the electric device. The fan 3 is rotated by the rotation of the motor 2 to send air. The heater 1 disposed on the discharge side changes the air from the motor 2 and the fan 3 into warm air.

As shown in FIG. 1, the control circuit 4 installed in the grip portion of the dryer has a power supply circuit 41, a microcomputer 42 constituting control means, a triac 43 for controlling the motor 2 and a heater 1 for controlling. Triac 4
It is composed of 4 etc. From the microcomputer 42, a gate signal which is a control signal of the triac 44 is generated to control the phase of the heater 1, and the phase is controlled.

Next, the operation will be described with reference to FIG. FIG. 3A shows the waveform of the power supply voltage of the AC power supply. The motor 2 rotates the fan 3 as described above and sends the wind to the heater 1. Heat is generated according to the power consumption of the heater 1, and hot air is emitted. When the power consumption of the heater 1 is changed, the temperature of warm air changes. The microcomputer 42 generates a gate signal for phase control, and the triac 44 performs a phase with the gate signal to change the power consumption of the heater 1.

Next, the case where the power consumption of the heater 1 is large will be described. The power supply voltage of the microcomputer 42 is 0
A gate signal for phase control is output near 0V after passing V (FIG. 3B). The gate signal turns on the triac 44, and the heater 1 is energized to generate heat. Since the on-time of the triac 44 is long (Fig. 3 (c)),
The heater 1 consumes a large amount of power and generates a large amount of heat, resulting in a high air temperature.

Next, when the power consumption of the heater 1 is small,
It is as follows. The microcomputer 42 outputs a gate signal for phase control in the vicinity of 0 V before the power supply voltage becomes 0 V (FIG. 3 (d)). The gate signal turns on the triac 44 and the heater 1 is energized to generate heat. Since the on time of the TRIAC 44 is short (Fig. 3
(E)) The power consumption of the heater 1 is small, the amount of heat generation is small, and as a result, the air temperature is low.

When the power consumption is high or low, the triac 44 is turned on when the power supply voltage is low, so that the obstacle to the outside is low. Next, the case where the power consumption of the heater 1 is medium will be described. In this case, as shown in FIG. 3 (f), when the timing of outputting the gate signal is near the peak of the power supply voltage, the microcomputer 42 delays and outputs the gate signal for phase control. Therefore, since the power supply voltage does not turn on near the peak, the disturbance to the outside is low.

(Embodiment 2) The configuration is the same as in the case of FIG. As an operation, when the power consumption is medium, that is, when the power consumption is set to output the gate signal for phase control near the peak of the power supply voltage (when the power consumption is medium), the microcomputer 42 The first cycle outputs the phase control gate signal earlier than the power supply voltage peak, and the second cycle outputs the phase control gate signal delayed from the power supply voltage peak. This is repeated.

FIG. 4 shows an operation waveform diagram in this case. It should be noted that when the power consumption is high or low, it is the same as that of the first embodiment, and therefore the description thereof is omitted and the power consumption is medium. When the timing of outputting the gate signal is near the peak of the power supply voltage, the microcomputer 42
Outputs the phase control gate signal earlier than the peak of the power supply voltage in the first cycle and after the peak of the power supply voltage in the second cycle (FIG. 4).
(B)). Therefore, the average power consumption is the set power consumption.

For example, when the set power consumption is 500 W, 1
The microcomputer 42 outputs the phase control gate signal so that the second time becomes 700 W and the second time becomes 300 W. As a result, the average power consumption becomes 500W. This embodiment repeats this operation. Incidentally, FIG. 4C shows the voltage waveform of the triac 44. Also in this embodiment, since the triac 44 is controlled so as not to be turned on when the power supply voltage is near the peak, the obstacle to the outside is low.

(Embodiment 3) Embodiment 3 is shown in FIG. Power supply reading circuit 45 for inputting and reading the power supply voltage to the control circuit 4
Is equipped with. The microcomputer 42 receives the data from the power supply reading circuit 45, and performs power supply voltage correction once in several cycles of the AC power supply and rated voltage control in the rest.

The phase control gate signal from the microcomputer 42 outputs the power supply voltage correction control signal once in several cycles, and outputs the rated voltage control signal in the remaining cycles. In this power supply voltage correction, when the microcomputer 42 inputs the power supply voltage and determines that it is lower than the rated voltage, the output timing of the control signal is advanced. When it is determined that the voltage is higher than the rated voltage, the output timing of the control signal is delayed. Several cycles including this power supply voltage correction cycle are repeated.

FIG. 6 shows an operation waveform diagram of this embodiment. Set power consumption 500W, power supply voltage AC90V,
The case where the rated voltage control is performed three times and the power supply voltage correction is performed once will be described as an example. During the rated voltage control period (three times), the control signal is output from the microcomputer 42 at a timing of 500 W at 100 V AC. During the power supply voltage correction period (once), the control signal is output from the microcomputer 42 at the timing of 650 W at AC 90 V (FIG. 6B). Average power consumption during these two periods is 50
It becomes 0W.

(Embodiment 4) As shown in FIGS. 7 and 8,
In this embodiment, an air temperature sensor 5 for inputting the hot air output from the dryer is provided. The microcomputer 42 inputs the output air temperature of the dryer and performs the following control. Air temperature correction is performed once in several cycles and constant output control is performed for the rest. Triac 44 from microcomputer 42
As the control signal to, the control signal for air temperature correction is output once in several cycles, and the control signal for constant output is output in the remaining cycles.

In this air temperature correction, when the microcomputer 42 inputs the output air temperature and determines that it is lower than the set warm air, the output timing of the control signal is advanced. When it is determined that the temperature is higher than the set temperature, the microcomputer 42
Delays the output timing of the control signal. Several cycles including this output correction cycle are repeated. Next, a specific embodiment will be described with reference to FIG. The setting output air temperature is 70 ° C., the output air temperature from the dryer is 60 ° C., constant output control is performed three times, and air temperature correction is performed once.

During the constant output control period (three times), the control signal from the microcomputer 42 for controlling the triac 44 is output at standard timing. External factors,
For example, the output air temperature changes due to a decrease in the power supply voltage. For example, when the output air temperature from the dryer drops to 60 ℃,
The microcomputer 42 inputs the decrease in the output air temperature from the air temperature sensor 5 to accelerate the output timing of the control signal (FIG. 9 (b)). Then, the power consumption of the heater 1 increases and the output air temperature rises. As a result, the output air temperature from the dryer becomes the set output air temperature.

[0026]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in the electric equipment for controlling the phase of the control element inserted between the AC power source and the load, the control signal of the control element is controlled at a specific timing of the AC power source to be controlled. Since the control means for varying the output timing is provided, it has an effect of having both advantages of the phase control and the zero-cross control as compared with the method of controlling with the same phase control timing.

In the second aspect, since the control signal is not output near the peak of the power supply voltage to be controlled and is delayed from the vicinity of the peak, the phase control is not performed near the peak of the power supply voltage, so that a failure to be output to the outside. Can be reduced, and the number of variable stages of power control can be increased. Further, in claim 3, a control signal is not output in the vicinity of the peak of the power supply voltage to be controlled, and the voltage is advanced from the vicinity of the peak,
By delaying or setting the output to a preset value, the phase control near the peak of the power supply voltage is not performed, so it is possible to reduce the obstacles that go out to the outside, and the variable power control. The number of steps can be increased.

Further, in the present invention, the control signal is output once every several cycles for correcting the power supply voltage. For example, by using a microcomputer as the control means, the control can be changed by the phase control. The number of steps can be increased. Further, in claim 5, the control signal is output once every several cycles for output correction.
For example, by using a microcomputer as the control means, it is possible to increase the number of variable stages of control by phase control.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing the above-mentioned dryer.

FIG. 3 is an operation waveform diagram of the same as above.

FIG. 4 is an operation waveform diagram of the second embodiment of the above.

FIG. 5 is a circuit diagram of Embodiment 3 of the above.

FIG. 6 is an operation waveform diagram of the above.

FIG. 7 is a diagram showing a dryer of Example 4 of the above.

FIG. 8 is a circuit diagram of the same as above.

FIG. 9 is an operation waveform diagram of the above.

[Explanation of symbols]

 1 Heater 2 Motor 4 Control Circuit 5 Air Temperature Sensor 42 Microcomputer 44 Triac

Claims (5)

[Claims] 1. An electric device for phase-controlling a control element inserted between an AC power supply and a load, wherein a control for varying the output timing of a control signal of the control element at a specific timing of the AC power supply to be controlled. A control device for an electric device, which is provided with means. 2. The control device for an electric device according to claim 1, wherein the control signal is not output near the peak of the power supply voltage to be controlled and is delayed from near the peak. 3. The control signal is not output near the peak of the power supply voltage to be controlled, and the output is set to a preset value by advancing or delaying from near the peak. Control device for electrical equipment. 4. The control device for an electric device according to claim 1, wherein the control signal is output once every several cycles for correcting the power supply voltage. 5. The control signal is output once every several cycles for output correction.
A control device for the electric device described.