JPH0556045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a switch circuit for ventilation fans used in bathrooms and toilets.

[Background technology] Traditionally, the light switch and the ventilation fan load switch for bathrooms and toilets were placed separately, and the user operated the switch each time. I was worried that I might forget to turn it off again. Also, conventionally,
There was also a switch circuit for this type of ventilation fan that used a current transformer in a bathroom ventilation switch to turn on the lighting load, turn it off, and drive the ventilation fan load for a certain period of time (delay time), but the current Those that use a transformer have had the problem of malfunctioning due to power outages. In other words, as shown in FIG. 7, a power outage occurs, and when the power is restored, the ventilation fan load malfunctions for a predetermined period of time.

Furthermore, as a switch for this kind of delay,
There are devices that use a mainspring or an oil dart pot as a delay element. However, this type of device is greatly affected by the surrounding environment such as temperature and magnetism, and cannot be delayed in operation after the switch is turned off. In addition, in the case of a spring type, a setting operation of winding the mainspring is required, and there is a problem that an oil dash pot cannot provide a long delay time. There was also a device that used an oil dart pot, and when the switch was turned on, the lighting load and the ventilation fan load started operating at the same time, and when the switch was turned off, only the ventilation fan load was turned off after a delay. However, in such a case, there are problems such as the cold in winter and the noise of the ventilation fan being loaded during use.

[Object of the Invention] The present invention has been provided in view of the above-mentioned points.
When turned off, the ventilation fan load operates for a certain period of time and then automatically stops the ventilation fan load.This ventilation fan is designed to prevent the ventilation fan load from being forgotten to be turned on or turned off, and to prevent the ventilation fan load from malfunctioning when a power outage returns. This provides a switch circuit.

[Disclosure of the Invention] Examples of the present invention will be described below with reference to the drawings.
Figure 2 shows a block diagram, and Figure 1 shows a specific circuit diagram.
A series circuit of lighting load 1 and switch SW is connected to . By turning on the switch SW, the lighting load 1 is turned on, and by turning off the switch SW, the lighting load 1 is turned off. A ventilation fan load 4 is operated after the lighting load 1 is turned off, and the lighting load 1 and the ventilation fan load 4 are installed in a bathroom, a toilet, or the like. 3 is a timer circuit, which includes timer IC 2, capacitors C ₄ , C ₅ , and resistor R ₄
It is composed of etc. This timer circuit 3 creates a certain delay time (time for operating the ventilation fan load 4) after the switch SW is turned off. Note that capacitor C ₄ is for smoothing, and resistor R ₄ ,
Capacitor _C5 is for time constant and determines the oscillation frequency of timer IC2. 5 is a power control circuit connected in series with the ventilation fan load 4;
TRAC, diode bridge DB, capacitor
It consists of C ₁ , resistor R _{1 ,} etc. capacitor
C ₁ and resistor R ₁ are for noise prevention, NL is a neon lamp for position display, and ZNR is a surge absorber. 6 is a switching circuit that turns on the power control circuit 5 for a delay time using a signal from the timer circuit 3, and includes a thyristor SCR, transistors Tr ₁ and Tr ₂ , a Zener diode ZD, a resistor R ₂ ,
It consists of capacitors C ₂ and C ₃ , etc. Capacitors C ₂ and C ₃ are for noise prevention. Reference numeral 16 denotes a lighting detection circuit for detecting whether the lighting load 1 is on or off, and is composed of a transistor Tr ₃ , a resistor R ₆ , a diode D ₁ , capacitors C ₆ and C ₇ , and the like. This lighting detection circuit 16 is a switch SW.
A control signal is output to the switching circuit 6 to drive the ventilation fan load 4 only when the switch is turned off (from on to off), and the transistor Tr ₂ of the switching circuit 6 is not turned on after the power is restored. be. Further, the ground lines of each circuit 3, 5, and 6 are connected to an alternating current power supply AC via an off terminal of a switch SW.

Next, the operation will be briefly explained using the block diagram of FIG. First, in order to light up the lighting load 1, when the switch SW is turned on from off, the lighting load 1 is turned on. At this time, each terminal of the lighting detection circuit 16
The voltages of I ₀ , I ₁ , and I ₂ become V ₁₀ > V ₁₁ = V ₁₂ for a half cycle period for each cycle of the AC power supply AC due to the presence of the rectifying diode D, and this condition is satisfied by the lighting detection circuit 16. is determined and an H level signal is output from terminal _F0 . This allows the capacitor to
C ₇ will be in a charged state. Next, lighting load 1
When the switch SW is turned from on to off to turn off the light, V ₁₀ = V ₁₂ > V ₁₁ and the condition of V ₁₀ > V ₁₁ = V ₁₂ is violated, so an L level signal is output from F ₀ . However, at this time, the charge stored in the capacitor _C7 turns on the switching circuit 6.
The switching circuit 6 turns on the power control circuit 5 to operate the ventilation fan load 4. At the same time, power is supplied to the timer circuit 3 through A→B→C→D, and the timer circuit 3 enters the timer function after being reset. At this time, the timer circuit 3 issues an output signal to keep the switching circuit 6 on. When a certain period of time (delay time of the timer circuit 3) has elapsed, the timer circuit 3 stops outputting the signal, the switching circuit 6 and the power control circuit 5 are turned off, and the ventilation fan load 4 is stopped. At this time too, V ₁₀ = V ₁₂
>V ₁₁ , F ₀ remains at L level. Since the condition of V ₁₀ > V ₁₁ = V ₁₂ is not satisfied even when the power is restored, the switching circuit 6 does not turn on. Incidentally, when the ventilation fan load 4 is on, the timer IC 2 of the timer circuit 3 is powered by using a small voltage remaining between N and S by controlling the phase of the power control circuit 5.

Incidentally, a block diagram of the timer IC 2 used in the timer circuit 3 is shown in FIG. The output of the oscillation circuit 7 is counted by the counter circuit 8, and the output of the counter circuit 8 is input to the output circuit 9.
The output circuit 9 outputs an H level output while the counter circuit 8 is counting the oscillation output of the oscillation circuit 7. Here, OS1, OS2, and OS3 are terminals that connect a resistor and a capacitor that determine the oscillation frequency. The oscillation frequency is determined by the resistance R ₄ shown in Figure 1,
Determined by capacitor _C5 . A reset circuit 10 stops the oscillation circuit 7 and clears the counter circuit 8 by inputting a reset signal. For the delay operation time of the timer circuit 3, the number of pulses counted by the counter circuit 8 is set in advance, and when the set number of pulses is counted, an L level signal is output from the output terminal OUT of the timer IC2. Therefore, the delay time of the timer circuit 3 is determined by the resistance R ₄ and the capacitor connected to the oscillation circuit 7.
This can be adjusted using _C5 . Note that for timer ICs that do not have an auto-reset circuit that resets when the power is turned on, a reset signal is input to the reset input pin when the power is turned on.

When the power is turned on to the timer IC2 as shown in FIG. 4b, the timer IC2 is reset and the oscillation circuit 7 outputs a pulse as shown in FIG. 4a, and the output terminal OUT outputs a pulse. 4
As shown in Figure c, an H level signal is output. When a predetermined number of pulses are counted, the oscillation operation of the oscillation circuit 7 is stopped, the counter circuit 8 is cleared, and an L level signal is output from the output terminal OUT via the output circuit 9.

Next, the operation of the circuit shown in FIG. 1 will be explained.
Now, in order to turn on the lighting load 1, when the switch SW is turned on from off, the lighting load 1 is turned on. At this time, V ₁₀ >V ₁₁ =V ₁₂ and the base current of transistor Tr ₃ that had been flowing through resistor R ₆ no longer flows, so transistor Tr ₃ is turned off. Therefore, capacitor _C7 is charged through resistor _R5 and diode _D1 . Next, when the switch SW is turned from on to off, V ₁₀ = V ₁₂ > V ₁₁ and the resistance R ₆
The base current of the transistor Tr ₃ is now supplied through the transistor Tr 3, and the collector potential of the transistor Tr ₃ becomes the ground potential. The charge stored in the capacitor _C7 becomes the base current of the transistor _Tr2 and is discharged, turning on the transistors _Tr2 and _Tr1 . By turning on the transistor Tr ₁ , it supplies power to the timer IC 2 and also
Trigger the thyristor SCR through the Zener diode ZD, resistor R ₂ . When the thyristor SCR is turned on, the triax TRAC is also turned on, and the ventilation fan load 4 is activated. Furthermore, by controlling the phase of the thyristor SCR, the power supply voltage to the timer IC2 utilizes the low voltage remaining between the anode and cathode of the thyristor SCR.

When timer IC2 is supplied with power supply voltage, it is reset and then enters the timer function (delay operation). At this time, the output terminal OUT of the timer IC2 outputs an H level signal to keep the transistor _Tr2 on. After a certain period of time, timer IC2
has counted the predetermined number of counts and the output terminal
Outputs an L level signal from OUT. Then,
Transistors Tr ₂ and Tr ₁ turn off, and at the next zero-crossing point of AC, thyristor SCR,
Triax TRAC is turned off and ventilation fan load 4 is stopped. In other words, switch SW
The ventilation fan load 4 operates for a certain period of time (delayed operation time) after the ventilation fan is turned off. Therefore, when the user turns off the switch SW to leave the bathroom, the ventilation fan load 4 operates for a certain fixed period of time. In this way, forgetting to turn on or turning off the ventilation fan load 4 can be prevented, and damage to the bathroom or mold growth in the bathroom due to forgetting to turn on the ventilation fan load 4 can be prevented. FIG. 5 shows the above-mentioned timing chart. FIG. 5a shows the operation of the switch SW, FIG. 5b shows the lighting load 1, and FIG. 5c shows the ventilation fan load 4. In addition, by using a pulse count IC to set the delay time, it has high time accuracy and can be miniaturized, and even with a long timer, the delay time can be checked in a short time. .

Incidentally, the operation upon recovery from a power outage is as follows. That is, when the lighting load 1 is turned on as described above, the base current of the transistor Tr ₃ does not flow, so the capacitor C ₇ is charged through the resistor R ₅ and the diode D ₁ to the capacitor C ₅ , and the switch is turned on. When the SW is turned off, the charge stored in the capacitor _C7 turns on the transistor _Tr2 , and enters the delay operation. During a power outage, capacitor _C7 is not charged, and even if the power is restored with the switch SW turned off, the capacitor C7 will not be charged.
Since C ₇ has no charge, the transistor Tr ₂ is not turned on, and the ventilation fan load 4 does not operate.

FIG. 6 shows a perspective view of a switch body using this circuit, in which a body 11 housing each of the circuits described above and a cover 12 placed over the top surface of this body 11 are assembled using an assembly frame 13. A switch operation plate 14 for turning on and off a switch SW is swingably provided on the cover 12.

[Effects of the Invention] As described above, the present invention includes a switch that turns on and off a lighting load connected to an AC power source, a lighting detection circuit that detects whether the lighting load is lit or not, and a switch that turns on and off a ventilation fan load. A power control circuit consisting of a driving and switching element, a timer circuit consisting of a timer IC that creates a certain delay time by an off signal from when the switch is turned from an on state to an off state, and a timer circuit consisting of a timer IC that creates a certain delay time when the switch is turned from an on state to an off state. The control signal from the lighting detection circuit that occurs only when the lighting is turned on controls the power control circuit to turn on and drive the ventilation fan load, and the power control circuit is turned off by being driven by the time-up signal after the delay time of the timer circuit has elapsed. Since the device is equipped with a switching circuit that turns off the ventilation fan load, when the switch that turns on the lighting load is turned from the on state to the off state, a signal from the timer circuit that operates for a certain delay time is used. The power control circuit is controlled via the switching circuit to drive the ventilation fan load. Therefore, it is possible to appropriately operate the lighting load and the ventilation fan load in, for example, a bathroom or toilet using one switch. It is effective. In addition, since semiconductor elements such as timer ICs and switching elements are used instead of current transformers as in the past, there is no mechanical noise, making it easy to reduce costs and downsize. Since the ventilation fan load is not driven while the toilet is in use, there is no need to worry about the cold in winter or the noise caused by the ventilation fan load. Furthermore, the power control circuit is turned on by the control signal from the lighting detection circuit that is generated only when the switch is turned from the on state to the off state, and the ventilation fan load is turned on, so that the ventilation fan load is activated. This occurs only when the switch is turned from on to off, and when the lighting load is off, such as after a power outage, the power control circuit cannot be turned on depending on the signal from the lighting detection circuit. Therefore, there is an effect that the ventilation fan load will not be operated by mistake after the power is restored.

[Brief explanation of the drawing]

Fig. 1 is a specific circuit diagram of the present invention, Fig. 2 is a block diagram of the above, Fig. 3 is a block diagram of the timer IC shown above, Fig. 4 is a timing chart of the above, and Fig. 5 is a usage state of the same. 6 is a perspective view of the same switch body as above,
FIG. 7 is an explanatory diagram of the operation of the conventional example. 1 is a lighting load, 2 is a timer IC, 3 is a timer circuit, 4 is a ventilation fan load, 5 is a power control circuit, 6
is a switching circuit, 16 is a lighting detection circuit,
SW indicates a switch, and AC indicates an alternating current power supply.

Claims (1)

[Claims] 1. A switch that turns on and off a lighting load connected to an AC power supply, a lighting detection circuit that detects whether the lighting load is on or off, a power control circuit that turns on and off a ventilation fan load and consists of a switching element, and the above-mentioned A timer circuit consisting of a timer IC that creates a certain delay time by an off signal from when a switch is turned from an on state to an off state;
The control signal from the lighting detection circuit that is generated only when the switch is turned from the on state to the off state controls the power control circuit to turn on and drive the ventilation fan load, and the time-up signal after the delay time of the timer circuit elapses A ventilation fan switch circuit comprising a switching circuit that is driven to turn off a power control circuit to turn off a ventilation fan load.