JPH0785675B2 - Ventilation fan operation switching device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a ventilation fan that requires remote switching of operating conditions.

2. Description of the Related Art Conventionally, in order to remotely switch the operation of a ventilation fan, as shown in FIG. 5, a required number of lines are switched from the motor of the ventilation fan (for example, a ventilation fan having one motor can be speed-adjusted in three stages In this case, four wires were wired between the ventilation fan body 101 and the hand switch 102.

Problems to be Solved by the Invention In such a conventional configuration, it is necessary to provide the number of wirings corresponding to the switching amount of the motor, and a ventilation fan having a large number of speed adjustment stages or a heat exchange type using a plurality of motors, etc. In the ventilation fan of
There was a problem that the wiring between the ventilation fan main body 101 and the hand switch 102 becomes complicated.

The present invention solves such a problem, and an object of the present invention is to provide a device for performing remote operation switching of a ventilation fan with simple wiring.

Means for Solving the Problems In order to solve this problem, the present invention provides an AC power supply, a ventilation fan driven by the AC power supply, the rotation speed of the ventilation fan, or a case where a plurality of ventilation fans are installed. And a hand switch for generating an intermittent AC waveform signal for instructing the operation of the control unit.The hand switch is a zero-cross point detection circuit of the AC power supply and this zero-cross point detection circuit. A pulse generation circuit that generates a pulse train in synchronization with the signal of the point detection circuit, a switch that switches the type of this pulse train, and an AC switch that intermittently conducts the AC power supply according to the pulse train to generate an intermittent AC waveform signal. According to the intermittent AC waveform signal, the control unit is configured to switch the rotation speed of the ventilation fan or the operation / stop of a plurality of ventilation fans.

Operation With this configuration, power is supplied from the main body of the ventilation fan to the hand switch with simple wiring, and different signals of multiple types of pulse trains are switched and sent from the hand switch, and the ventilation fan main body side discriminates the operation of the fan. It will be.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, reference numeral 1 denotes a ceiling-embedded ventilation fan, and control units 3 and 3 connected to a hand switch 2 mounted on a wall surface in a room.
It is composed of a motor 4 having windings for speed adjustment of stages (strong notch, middle notch, weak notch). The hand switch 2 is, for example, an AC-DC conversion circuit 2-as shown in FIG.
1, a zero-cross point detection circuit 2-2, an AC switch 2-
3, a pulse generation circuit 2-4, a switch 2-5, and an operation display lamp 2-6. The zero-cross point detection circuit 2-2 is connected to the AC / DC conversion circuit 2-1 and the pulse generation circuit 2-4. This pulse generation circuit 2-
An AC switch 2-3 and an operation display lamp 2-6 are also connected to the switch 4. The AC-DC conversion circuit 2
The AC side of -1, the AC switch 2-3, and the resistor 3-1 of the control unit 3 are connected in series to the AC power supply. The control unit 3 includes a resistor 3-1, a pulse conversion circuit 3-2, a determination circuit 3-3 and a motor connection switching circuit 3-4.

In the operation switching device of the ventilation fan configured as described above, the AC-DC conversion circuit 2-1 includes the hand switch 2
It is a DC power source in the above, and the effective value of the voltage value on the AC side is controlled by switching the AC switch 2-3, and the voltage on the DC side can be adjusted. For example, as shown in Fig. 4a, by controlling the waveform of a sine wave alternating current,
Consider the four types of waveforms. In the figure, four kinds of waveforms are continuously shown, but when only one actual section is continuously realized, the effective values are made equal to each other, and as a DC power source in the hand switch 2. I am working. Now, assuming that a weak notch switch is pressed by the switch 2-5, the pulse generating circuit 2-4 lights up the operation display lamp 2-6 to indicate that the weak notch is present and also detects the zero cross point. In synchronization with the zero-cross signal detected by the circuit 2-2 (Fig. 4d), the AC switch 2-3 is switched as in the section of Fig. 4c to control the waveform of the sine wave AC as a. To do. At this time, the waveform at both ends of the resistor 3-1 of the control unit 3 also becomes like "a" and is converted by the pulse conversion circuit 3-2 into a pulse train as shown in FIG. The discrimination circuit 3-3 discriminates this pulse train, switches the relay contact of the motor wire connection switching circuit 3-4, and operates the ventilation fan with a weak notch.

Next, assuming that the switch of the middle notch is pressed by the switch 2-5, the pulse generating circuit 2-4 similarly lights the operation display lamp 2-6 to indicate that the middle notch is displayed, and the zero cross point is also displayed. In synchronization with the zero-cross signal detected by the detection circuit 2-2, the AC switch 2-3 is switched as in the section of FIG. 11C to control the sine wave AC waveform as shown by a. At this time, the waveform at both ends of the resistor 3-1 of the control unit 3 also becomes like "a" and is converted by the pulse conversion circuit 3-2 into a pulse train as shown in FIG. The discriminating circuit 3-3 discriminates the pulse train, switches the relay contact of the motor wire connection switching circuit 3-4, and operates the ventilation fan at the middle notch.

The same applies to the case of a strong notch and stop, so the description is omitted. The switch 2-5 generates four kinds of pulse trains of sections ,,, and performs waveform control so that the effective values of the power supplies become equal to adjust the voltage of the DC power supply in the hand switch 2, and also to the control unit 3 the four kinds of signals. The pulse train of the signal is discriminated by the discriminating circuit 3-3, the relay contact of the motor wire connection switching circuit 3-4 is switched, and the speed of the ventilation fan is adjusted.

As described above, according to the present embodiment, it is possible to adjust the speed in three stages with two wires, supply power to the hand switch 2 from the ventilation fan main body side, and the wiring becomes complicated. It can be prevented.

In the embodiment, the ventilation fan 1 is of a ceiling-embedded type, but needless to say, it is not limited to this type of product and can be applied to those requiring remote operation switching.

Further, the speed adjustment is not limited to three steps, and the operation switching of a plurality of motors may be performed.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the present invention, the hand switch of the ventilation fan requiring remote operation is provided with the zero cross point detection circuit of the AC power supply and the signal of the zero cross point detection circuit. A pulse generation circuit that generates a pulse train in synchronization with, a switch that switches the type of this pulse train, and an AC switch that intermittently conducts the AC power supply according to the pulse train to generate an intermittent AC waveform signal, By providing a control unit that switches the rotation speed of the ventilation fan or the operation / stop of multiple ventilation fans according to the intermittent AC waveform signal, speed adjustment and operation commands of multiple ventilation fans can be sent to the ventilation fan main unit using simple wiring. While you can
Power can be supplied from the ventilation fan main unit side to the hand switch side, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a wiring diagram of a ventilation fan operation switching device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the same switch, FIG. 3 is a circuit diagram of the same control unit, and FIG. Fig. 4b is a signal waveform diagram of the control circuit, Fig. 4c is a switching signal diagram of the AC switch, Fig. 4d is a zero crossing signal diagram, and Fig. 5 is It is a wiring diagram of the operation changeover switch of the conventional ventilation fan. 1 ... Ventilation fan, 2 ... Hand switch, 2-2 ... Zero cross point detection circuit, 2-3 ... AC switch, 2-4 ... Pulse generation circuit, 2-5 ... Switch, 3 ... Control Department.

Claims (1)

[Claims] 1. An AC power supply, a ventilation fan driven by the AC power supply, a rotation speed of the ventilation fan, or a control unit for controlling operation / stop when a plurality of the ventilation fans are installed.
The hand switch is configured to generate a continuous AC waveform signal for instructing the operation of the control unit, and the hand switch generates a pulse train in synchronization with the zero cross point detection circuit of the AC power supply and the signal of the zero cross point detection circuit. A pulse generation circuit for generating and a switch for switching the type of this pulse train, and an AC switch for intermittently conducting the AC power supply in accordance with the pulse train to generate an intermittent AC waveform signal, the control unit, the intermittent AC A ventilation fan operation switching device configured to switch the rotation speed of the ventilation fan or the operation / stop of multiple ventilation fans according to the waveform signal.