JP2001196912A - Timer switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a conventional timer switch that has had a factor leading to cost increase because an expensive microcomputer has been used to grasp a state of an operation switch turning on/off a load and for realization of a timer function and programming is required for the timer mechanism. SOLUTION: The timer switch is provided with a load control switching means that is located between an AC power supply and a load, a boot power supply means that has an operation switch to boot the load control switching means, and a timer means that consists of a conventional IC or a comparator, brings the load control switching means and the boot power supply means into an on-state for a prescribed time when the operation switch for the boot power supply means is turned on and brings the load control switching means into an off-state after a lapse of a prescribed time of the timer means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timer switch for turning on a load such as a ventilation fan and an illuminator and automatically turning off the load after a predetermined time has elapsed.

[0002]

2. Description of the Related Art Conventionally, a timer switch using a microcomputer as a control element has been put into practical use as a timer switch for turning on a load such as a ventilation fan and an illumination lamp for a preset time. . For example, a specific configuration and operation of a timer switch that controls on / off of a ventilation fan will be described with reference to FIG.

In FIG. 9, reference numeral 71 denotes a commercial AC power source. One of the AC power sources 71 is connected to one terminal 7 of a timer switch 73 through an AC motor of a ventilation fan 72.
4 and the other terminal 75 of the timer switch 73 is connected to the other end of the AC power supply 71.

The timer switch 73 has a surge attraction element 76 such as a varistor and a capacitor 77 connected in parallel between the one terminal 74 and the other terminal 75. Further, the one terminal 74 is connected to one AC input terminal of a rectifier circuit 81 configured by a diode bridge connection via a series connection of a line noise suppression coil 78 and a gate resistor 79 of a triac 80.
The other terminal 75 is connected to the other AC input terminal of the rectifier circuit 81. The coil 78 and the gate resistor 7
9 and the other terminal 75, the main electrode T1-T2 of the triac 80 is connected, and the gate G of the triac 80 is connected between the gate resistor 79 and one AC input terminal of the rectifier circuit 81. Connected to a point.

A series circuit of a resistor 82, an operation switch 83, a diode 84 and a constant voltage diode 85 is connected between the positive and negative DC output terminals of the rectifier circuit 81. The input terminal on the light receiving side of the photocoupler 86 is connected to the positive DC output terminal of the rectifier circuit 81. The connection point between the operation switch 83 and the anode of the diode 84 is connected to the base of a transistor 94 for detecting the state of the operation switch 83 via a base resistor 92. The connection point between the cathode of the diode 84 and the cathode of the constant voltage diode 85 is connected to the positive pole of the electrolytic capacitor 87, and the negative pole is connected to the negative DC terminal of the rectifier circuit 81. The positive electrode side of the electrolytic capacitor 87 becomes a positive (+) power supply line, and is connected to a power supply terminal Vdd of the microcomputer 95, an output end on the light receiving side of the photocoupler 86 via a resistor 88, and a collector of the transistor 94. It is connected via a resistor 93. The collector of the transistor 94 is connected to the input terminal r80 of the microcomputer 95. The emitter of the transistor 94 and the power supply terminal Vss of the microcomputer 95 are connected to the negative DC output terminal of the rectifier circuit 81. The light emitting side input terminal of the photocoupler 86 is connected to a positive (+) power supply line, and the light emitting side output terminal is connected to the output terminal r40 of the microcomputer 95 via the resistor 89. Different time selection contacts A1 to A4 of a time selection switch 96 are connected to terminals r51 to r54 of the microcomputer 95, and a common contact c is connected to a negative DC output terminal of the rectifier circuit 81.

The photocoupler 86 and the resistor 89 constitute a switch element 90, and the resistors 92 and 93 and the transistor 94 constitute an operation switch confirmation circuit 91.

The operation switch 83 is a push button type switch in which the movable piece is always in an off state separated from the fixed pieces, and when the movable piece is pressed, the fixed pieces are short-circuited on.

The operation of the timer switch 73 having such a configuration will be described. A current does not flow from the AC power supply 71 to the timer switch 73 via the ventilation fan 72 unless the operation switch 83 is turned on. When the operation switch 83 is turned on, the DC power output from the rectifier circuit 81 is switched to the resistor 82, the operation switch 83, and the diode 84.
Is supplied to the electrolytic capacitor 87 through the charging circuit. The electrolytic capacitor 87 is charged to a voltage regulated by the constant voltage diode 85, supplies drive power to a power supply terminal Vdd of the microcomputer 95, and starts up the microcomputer 95. When the microcomputer 95 starts up, the output terminal r40 of the microcomputer 95 becomes low (L) level, turning on the photocoupler 86 of the switch element 90, and the DC power from the rectifier circuit 81 is turned on by the operation switch 83.
Is turned off, DC power is continuously supplied to the electrolytic capacitor 87 and the constant voltage diode 85 via the switch element 90 and the resistor 88.

On the other hand, due to the rectification operation of the rectifier circuit 81, a current I flows through the gate resistor 79, and a gate voltage (current) for turning on the triac 80 is supplied to the gate resistor 79 connected between the terminal T1 and the gate G of the triac 80. I × the resistance value R of the gate resistor 79 is obtained. When the triac 80 is turned on, a predetermined current is supplied from the AC power supply 71 to the motor of the ventilation fan 72, and the ventilation fan 72 is continuously driven to rotate.

The triac 80 and the switch element 90 are turned on and off in conjunction with each other.

When the triac 80 is turned on, there is no AC power input to the rectifier circuit 81, the charging of the electrolytic capacitor 87 is stopped up to the point near the zero cross, and when the triac 80 reaches the point near the zero cross, the triac 80 is turned off, and the electrolytic capacitor 87 is turned off again. The charging of 87 is started. That is,
The charging of the electrolytic capacitor 87 via the switch element 90 is performed only in the period near the zero crossing of the AC power supply,
Most of the AC power is supplied to the ventilation fan 72.

Next, when the operation switch 83 is turned on again, the transistor 94 of the operation switch confirmation circuit 91 is turned on, and the collector changes from high level (H) to low level (L). On the other hand, the microcomputer 95 sets the input terminal r80 to the low level (L) by the built-in program.
, It is determined that the operation switch 83 has been turned on again. When the operation switch 83 is turned on again and a change in the collector of the transistor 94 from high level (H) to low level (L) is input to the input terminal r80 of the microcomputer 95, the output terminal r40 is set to high level ( H) to turn off the switch element 90, open the DC output side of the rectifier circuit 81, eliminate the voltage drop of the gate resistor 79, turn off the triac 80, and turn off the ventilation fan 72.
Stops.

The time of the timer function built in the microcomputer 95 is selected by the time selection switch 96, and a signal for turning off the switch element 90 is supplied from the output terminal r40 of the microcomputer 95 after the lapse of the selected time. The ventilation fan 72 can be automatically stopped after the time selected to turn off the ventilation fan 22 has elapsed.

[0014]

A timer switch of this kind is used for controlling the operation of a ventilation fan or a lamp installed in a toilet room, a bathroom, or the like, alone or in parallel, thereby simplifying installation work and reducing costs. Is required to be reduced. In the conventional timer switch described above, the state of the operation switch for turning on / off the load of the ventilation fan and the lighting is grasped by an expensive microcomputer, and the microcomputer also has a timer function. For this reason, after the operation switch is operated and it is determined that the operation of turning off the load by the microcomputer is performed, the load is continuously driven for several minutes (about 3 to 5 minutes) by the timer function of the microcomputer. In order to sometimes turn off the load, it is necessary to set a timer program for a few minutes in the microcomputer, so that development of the timer program requires a lot of cost, and there is a problem that the cost of the timer switch rises.

On the other hand, timer control for several minutes can be performed by a general-purpose timer IC without using an expensive microcomputer, and a low-cost timer switch can be provided. Therefore, in view of the conventional problems, the present invention provides a timer switch that continuously drives the load for a predetermined time after the user turns on the load, and turns off the load when the time of the predetermined time elapses, without using an expensive microcomputer. , CR
It is an object of the present invention to provide an inexpensive timer switch using a general-purpose logic of a receiving / discharging circuit, an operational amplifier, and a general-purpose timer IC.

[0016]

SUMMARY OF THE INVENTION A timer switch according to the present invention is a start-up switch having a load control switching means disposed between an AC power supply and a load, and an operation switch for starting the load control switching means. Power supply means; and a timer means for turning on the load control switching means and the start-up power supply means for a predetermined time when an operation switch of the start-up power supply means is turned on. .

The load control switching means of the timer switch according to the present invention includes a triac connected to an AC power supply via a load, a rectifier circuit connected to both ends of the triac, and a dc output terminal of the rectifier circuit. And a switching element.

The power supply means for starting the timer switch of the present invention includes a switch means comprising an operation switch and a latching relay connected to the DC output of the rectifier circuit, and a switch means for turning on the operation switch of the switch means. ,
A low-voltage power supply unit that turns on a latching relay based on a DC output from the rectifier circuit, and generates a low voltage,
After a lapse of a predetermined time set by the timer means, a switching element at a DC output terminal of the rectifier circuit and a control means for turning off the latching relay are provided.

The power supply means for starting the timer switch of the present invention includes a switch means comprising an operation switch connected to the DC output of the rectifier circuit, a transistor switch arranged in parallel with the operation switch, A low-voltage power supply unit that turns on the transistor switch based on the DC output of the rectifier circuit when the operation switch is turned on, and that generates a low voltage; and a predetermined voltage set by the timer unit. After a lapse of time, the switching element at the DC output terminal of the rectifier circuit and the transistor switch are turned off.

A timer switch according to the present invention comprises a triac connected to an AC power supply via a load, a rectifier circuit connected to both ends of the triac via latching relay contacts, and an operation connected to both ends of the triac. A low voltage is generated based on a DC control output of the rectifier circuit of the load control switch means including a switch, a latching relay coil, and a switching element connected to a DC output terminal of the rectifier circuit. Operating the load control switch means, comprising: a power supply means for start-up having low voltage power supply means for performing the operation, and a timer means for starting a timer by starting up the low voltage generated by the power supply means for start-up. When the switch is turned on,
The latching relay contact is turned on, a low voltage is generated by the low-voltage power supply means of the power supply means for starting, the start of the timer is started by the timer means, and the switching element at the DC output terminal of the rectifier circuit is turned on. On and after the predetermined time set by the timer means,
The switching element at the DC output terminal of the rectifier circuit and the latching relay contact of the load control switch means is turned off.

The latching relay coil connected to both ends of the triac of the load control switch means of the timer switch of the present invention turns on / off the latching relay contact.
It has a set coil and a reset coil that are turned off, and the set coil is arranged in series with the operation switch,
The reset coil is arranged in series with a photocoupler, and turns on a relay contact by the set coil by turning on the operation switch, and after a predetermined time set by the timer means has passed, a control signal from the timer means. Wherein the latching relay contact is turned off by the reset coil via the photocoupler.

The timer switch according to the present invention includes a triac connected to an AC power supply via a load, a rectifier circuit connected to both ends of the triac via an operation switch, and a DC output terminal of the rectifier circuit. Switch control means comprising a switching element, a start-up power supply means having low-voltage power supply means for generating a low voltage based on a DC output of a rectifier circuit of the load control switch means, Timer means for starting a timer by starting a low voltage generated by the power supply means, a photocoupler connected in parallel to an operation switch of the load control switch means, and a photocoupler connected from the timer means. Switch means comprising photocoupler control means for performing on / off control based on a control signal; In response to the ON operation of the operation switch of the switch means, a low voltage generation by the low voltage means of the power supply means for starting, the start of the timer by the timer means, the switching element of the DC output terminal of the rectifier circuit, And turning on the switch means, and after a predetermined time set by the timer means elapses, turning off the switch means and the switching element based on a control signal from the timer means.

The off operation of the latching relay provided in either the load control switch means of the timer switch of the present invention or the start-up power supply means is performed based on a time-up signal from the timer means. And control means for controlling the exciting current supplied to the reset coil.

The timer means of the timer switch according to the present invention is characterized by comprising a general-purpose timer integrated device.

The timer means of the timer switch according to the present invention is characterized by comprising a CR charge / discharge circuit and a comparator circuit using an operational amplifier.

The rectifier circuit is operated by turning on the operation switch by the timer switch of the present invention, or closing the relay contact by exciting the set coil of the latching relay in conjunction with the operation switch. Is supplied to the startup power supply means to generate a low potential. The low potential causes the timer means to operate, and based on a control signal from the timer means, turns on a switch element that closes the DC output side of the rectifier circuit, thereby setting a predetermined value set in the timer means. AC power is supplied to the time load, and the power supply means for start-up and the timer means can also be operated continuously. When a predetermined time set in the timer means elapses, based on a time-up signal from the timer means, the switch element that closes the DC output side of the rectifier circuit is turned off, and the latching is performed. Energize the reset coil of the relay to release the relay contact. As a result, the supply of AC power to the load is stopped, and the supply of drive power to the timer switch itself can be stopped.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a connection block diagram showing a circuit configuration of a first embodiment of the timer switch according to the present invention, and FIG. 2 is an explanatory diagram for explaining the operation of the timer switch shown in FIG. In FIG. 1, the same parts as those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

A commercial AC power supply 71 and a ventilation fan 72 are connected between the terminals 74 and 75 as in FIG. In addition,
A coil 78 and a gate resistor 79 are connected and arranged between the terminal 75 and the AC input terminal of the rectifier circuit 81, but are substantially the same as FIG.

The difference between the first embodiment shown in FIG. 1 and the prior art shown in FIG. 9 is that the anode of the thyristor 11 is connected to the positive terminal of the DC output of the rectifier circuit 81 and the cathode of the thyristor 11 is connected to the negative terminal of the DC output. It is connected. The gate of the thyristor 11 is connected to the rectifier circuit 8 through the resistor 12 and the capacitor 13.
1 is connected to the negative terminal of the DC output. Between the positive terminal and the negative terminal of the DC output of the rectifier circuit 81, a set coil 1 of a latching relay that attracts a resistor 14, an operation switch 15, and a relay contact 16 of a latching relay described later.
7 series circuits are connected. Operation switch 15
Is a push button type switch in which the movable piece is always in an off state apart from both fixed contact pieces, and when the movable piece is pressed, the fixed contact pieces are short-circuited on.

The positive terminal of the DC output of the rectifier circuit 81 has:
The collector of the transistor 18 is connected via the relay contact 16. A collector resistor 19 is connected between the collector and base of the transistor 18, and the base is connected to the negative terminal of the DC output of the rectifier circuit 81 via a constant voltage diode 20. Also, this transistor 1
8 and the negative terminal of the DC output of the rectifier circuit 81, an electrolytic capacitor 21 and the relay contact 16
Are connected in parallel with a series circuit of the reset coil 22 for releasing the current and the collector / emitter of the transistor 23.

When the operation switch 15 is turned on, the DC output current of the rectifier circuit 81 excites the set coil 17 to attract on the relay contact 16. When the relay contact 16 is turned on, the transistor 18 is also turned on,
The DC output of the rectifier circuit 81 allows the electrolytic capacitor 2
1 is charged to the potential + V regulated by the constant voltage diode 20. By the charging potential of the electrolytic capacitor 21, +
The pole side is a + V potential line, and the-pole side is a reference (E) potential line.

The base of the transistor 23 is a resistor 24
Is connected to the output terminal of the AND gate circuit 25,
The input terminal 1 of the AND gate circuit 25 is connected to the + V potential line via a resistor 26 and to the E potential line via an electrolytic capacitor 27. Further, the input terminal 2 of the AND gate circuit 25 is connected to the output terminal of the inverter circuit 36.

A timer section 28 is connected between the + V potential line and the E potential line. The timer unit 28 includes a general-purpose timer IC 31 such as a BU 230
2 (manufactured by ROHM). This timer IC
The Vdd terminal 31 is connected to the + V potential line,
The ND terminal is connected to the E potential line. The OUT terminal of the timer IC 31 is connected to the base of a transistor 29. The emitter of the transistor 29 is connected to the + V potential line, and a resistor 30 is connected between the emitter and the base. Further, the SET terminal of the timer IC 31 is connected via a capacitor 35,
It is connected to the E potential line. The timer IC 31
Resistor 32 to OSC1 terminal and capacitor 3 to OSC2
3. A resistor 34 is connected to the OSC3 terminal.
2, 34 and one end of the capacitor 33 are connected to each other. The collector of the transistor 29 is connected to the gate of the thyristor 11 via a resistor 37 and to the input terminal of the inverter 36.

The operation of the timer switch having such a configuration will be described with reference to FIG. Operation switch 1
When the switch 5 is turned on, the set coil 17 is excited by the DC output rectified by the rectifier circuit 81, the relay contact 16 is closed, and the DC output of the rectifier circuit 81 is supplied to the transistor 18 as a switching element to be turned on. When the transistor 18 is turned on, the electrolytic capacitor 21 is charged, and the + V potential line rises to the voltage + V regulated by the constant voltage diode 20. The rising of the voltage of the + V potential line causes the timer IC of the timer unit 28 to operate.
When the capacitor 35 of the SET terminal 31 is charged, SE
The T terminal becomes high (H) level and the timer starts, the OUT terminal of the timer IC 31 becomes low (L) level, the transistor 29 is turned on, and the gate of the thyristor 11 is set to the H level via the gate resistor 37. Turn on.

When the thyristor 11 is turned on, the AC power supply 71 is supplied via a terminal 74, a rectifier circuit 81, a thyristor 11, a rectifier circuit 81, a gate resistor 79, a coil 78, a terminal 75, and a ventilation fan 72 as a load. When the triac 80 is turned on by the gate voltage of the gate resistor 79 and the ventilation fan 72 continues to be driven, and the triac 80 is turned off near the zero cross, the electrolytic capacitor 21 is charged and the + V potential is continuously generated. Is done.

On the other hand, when the transistor 29 of the timer section 28 is turned on, the collector of the output is at the H level. This output is input to the input terminal 2 of the AND gate circuit 25 via the inverter 36. The input terminal 2 of the AND gate circuit 25 goes low. The input terminal 1 of the AND gate circuit 25 is supplied with the + V potential from the + V potential line via the resistor 26, stays at the L level until the capacitor 27 is charged, and goes to the H level when the capacitor 27 is charged. On the other hand, in the timer IC 31, the AND gate circuit 25 is temporarily at the H level until the capacitor 35 is charged and the timer is started. Therefore, the output of the AND gate circuit 25 is at the logical product L level, and the transistor 23 is kept off.

Next, when a predetermined time has elapsed from the start of the timer IC31, the timer IC31 is started.
Sets the OUT terminal to the H level to turn off the transistor 29. When the transistor 29 is turned off, the thyristor 11 is turned off, and the DC output side of the rectifier circuit 81 is opened, so that the triac 80 is also turned off.
The supply of the AC power supply 71 stops, and the ventilation fan 72 stops.

On the other hand, when the transistor 29 of the timer section 28 is turned off, the collector output becomes L level, and the input terminal 2 of the AND gate circuit 25 is set to H level via the inverter 36, and this AND gate circuit 25 Becomes the logical product H level, the transistor 23 is turned on, the reset coil 22 of the latching relay is excited, and the relay contact 16 is opened.
As a result, the operation of the timer switch itself is stopped.

That is, when the switch button for instructing the on / off of the AC power supply to the load is pressed, the contact pieces come into contact between the contacts and turn on, and when the switch button is released, the contact pieces separate from the contacts and turn off. The operation switch 15 is used, and a general-purpose timer IC 31 is used for the timer section 28. When the operation switch 15 is turned on, the set coil 17 of the latching relay is excited to keep the relay contact 16 on. ,
By turning on the relay contact 16, the transistor 18 as a switching element is turned on, and a low potential + V is generated by a low voltage power supply unit composed of an electrolytic capacitor 21 and a constant voltage diode 20, and a timer is generated by the low potential + V. The thyristor 11 and the triac 80 are controlled to be on based on the output of the timer unit 28, and the AC power supply 71 is supplied to the ventilation fan 72, which is a load, regardless of whether the operation switch 15 is off. And the driving of the timer switch is continuously maintained.

On the other hand, when the time set in the timer section 28 elapses, the thyristor 11 is turned off and the triac 80 is turned off based on the output of the timer IC 31, so that the triac 80 is turned on. Is stopped, the output level of the timer section 28 is determined by the AND gate circuit 25, and the reset coil 22 of the latching relay is excited at + V potential to turn off the relay contact piece 16. Then, the driving of the timer switch is also stopped.

Thus, while the timer switch is operated by using a general-purpose inexpensive timer IC, most of the AC power is used as power for driving the load, and the timer switch is used for a small amount near the zero cross. The driving power is supplied to the load within the time set in the timer section, while the driving power is continuously supplied to the load. When the time set in the timer section elapses, the power supply to the load and the timer switch can be automatically turned off. By changing the constants of the resistors 32 and 34 and the capacitor 33 connected to OSC1 to OSC3 of the timer IC 31,
The driving time of the timer switch 31 can be changed as needed.

Next, a modification of the first embodiment of the present invention will be described with reference to FIG. FIG. 3 shows the timer section 28.
Instead of the general-purpose timer IC 31 used in the first embodiment, a timer unit including a charge / discharge circuit using a capacitor and a resistor and a comparator using an operational amplifier is used.

In the timer section of this modification, a series circuit of a capacitor 40 and a resistor 41 and a series circuit of a collector / emitter of a transistor 42, a resistor 43 and a capacitor 44 are provided between the + V potential line and the E potential line. They are connected in parallel. The connection point between the capacitor 40 and the resistor 41 is connected to the base of the transistor 42.
A resistor 43 connected to the emitter of the transistor 42
The connection point of the capacitor 44 is connected to the E potential line via a sliding resistor 45 and the collector and emitter of a transistor 46, and is connected to a negative input terminal of a first comparator 48 generated by an operational amplifier. 47 are connected. The output terminal of the first comparator 48 is connected to the negative input terminal of the second comparator 50 and the base of the transistor 46 via a resistor 49. The + input terminals of the first and second comparators 48 and 50 are connected to a connection point of voltage dividing resistors 51 and 52 connected between the + V potential line and the E potential line. The output terminal of the second comparator 50 is connected to a gate resistor 37 to which the output of the timer section 28 is supplied.
And an input terminal of the inverter 36 (see FIG. 1).

Next, the operation of this modified example will be described in conjunction with FIG. 1 described above. When the operation switch 15 is pressed and turned on, the relay contact 16 is turned on and the + V potential line is set to +
When the potential rises to the V potential, the base of the transistor 42 is connected to the + V potential line via the capacitor 40. Therefore, until the capacitor 40 is charged, the transistor 42 is turned on and the capacitor 44 is substantially connected to the + V potential line. It is charged to the same potential. When the capacitor 40 is completely charged, the transistor 42 is turned off, the charging operation of the capacitor 44 is stopped, and the electric charge charged in the capacitor 44 is discharged via the sliding resistor 45.

The first and second comparators 48 and 50
A voltage obtained by dividing the potential + V by the resistors 51 and 52 is supplied to both + input terminals as dark values. The capacitor 4
Due to the charge of 4, the input voltage of the first comparator 48 becomes the + terminal <1 terminal, and the output thereof becomes the L level.
The input voltage of the second comparator 50 becomes -terminal <+ terminal, and its output becomes H level. The thyristor 11 is turned on by the output of the second comparator 50 via the gate resistor 37, whereby the triac 80 is turned on and the AC power is continuously supplied to the load. further,
Due to the H level output of the second comparator 50, the output of the inverter 36 becomes L level, and the output of the AND gate circuit 25 maintains L level. The capacitor 4
4 is charged by the first and second comparators 48 and 5
The output of the second comparator 50 remains at H until the threshold value of 0 is divided.
Maintain levels. That is, the ventilation fan 72 which is the load
, And the potential of the + V potential line for driving the timer unit 28 is also maintained and generated.

The charge of the capacitor 44 is discharged via a sliding resistor 45, and the first and second comparators 4
When the value is equal to or less than the threshold value of the positive terminal of 8,50, that is, the first
When the comparator 48 has a negative terminal <+ terminal, the output thereof becomes H level, and the transistor 46 is turned on. When the transistor 46 is turned on, the capacitor 4
4 are short-circuited at both ends, and the electric charge is discharged at once. As a result, the second comparator 50 has a relationship of −terminal> + terminal, and its output (timer output) becomes L level,
The thyristor 11 is turned off, the triac 80 is also turned off, and the power supply to the load is stopped.

On the other hand, in the AND gate circuit 25, the L level of the output of the second comparator 50 is set to the H level by the inverter 36, the output thereof is set to the logical product H level, and the transistor 23 is turned on. Then, the reset coil 22 is excited to open the relay contact 16. As a result, the timer switch itself is turned off.

Since the discharge time constant of the capacitor 44 can be variably selected by selecting a resistance value of the sliding piece of the sliding resistor 45, the supply time of the AC power supply to the load can be set.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the timer switch of FIG. 4 of the second embodiment and the timer switch of FIG. 1 of the first embodiment is that the operation switch 15, the set coil 17 of the latching relay, the reset coil 22, and the relay contact 16 Is arranged on the DC output side of the rectifier circuit 81, but in the second embodiment, it is provided on the AC input side of the rectifier circuit. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

The same operation switch 1 as the operation switch 15 is connected between a terminal 74 which is an input terminal and a connection point between the line noise suppression coil 78 and the gate resistor 79 on the terminal 75 side.
A series circuit of the set coil 5a and the set coil 17a of the latching relay, and a series circuit of the light receiving side of the photocoupler 53 and the reset coil 22a of the latching relay are connected in parallel. Further, between the terminal 74 and the AC input terminal of the rectifier circuit 81, the relay contact 16 of the latching relay is provided.
a is connected. Thereby, the positive terminal of the DC output of the rectifier circuit 81 is directly connected to the collector of the transistor 18 as the switching element. The output terminal of the AND gate circuit 25 is connected to the base of a transistor 54 via a resistor 55. The collector of the transistor 54 is connected to the output terminal on the light emitting side of the photocoupler 53. The emitter is an E potential line. It is connected to the. The light-emitting side input terminal of the photocoupler 53 is connected to the + V potential line via a resistor 56.

The operation of the timer switch having such a configuration will be described with reference to FIG. Operation switch 15
When a is turned on, the set coil 17a is excited by an AC power supply, the relay contact 16a is kept on, and the AC power supply is supplied to the rectifier circuit 81 via the load. With the DC output rectified by the rectifier circuit 81, the transistor 18 is turned on, the electrolytic capacitor 21 is charged to the potential + V regulated by the constant voltage diode 20, and the + V potential line rises. When the + V potential line rises, the timer section 28 operates as described above to start the timer, and at the same time, the thyristor 11 is turned on. When the thyristor 11 is turned on, the DC output circuit of the rectifier circuit 81 is closed. Even when the triac 80 is turned on and the operation switch 15a is turned off, AC power is continuously supplied to the load.

Next, at the time-up when the timer count of the timer section 28 ends, the timer IC 31
Under the control from the T terminal, the transistor 29 is turned off, and the thyristor 11 is turned off. When the thyristor 11 is turned off, the triac 80 is also turned off, and the supply of AC power to the load is stopped. On the other hand, the input terminal 2 of the AND gate circuit 25 becomes H level by the output of the timer section 28, and the transistor 54 is turned on by the logical product H level of the output. This transistor 5
4 is turned on, the photocoupler 53 is also turned on,
The reset coil 22 is excited by the AC power supply,
The relay contact 16a is opened and turned off. Thus, the supply of AC power to the load and the driving of the timer switch itself are stopped.

It should be noted that the timer section 2 of the second embodiment
It is also possible to replace 8 with a timer unit comprising a comparator using general-purpose logic such as a resistor / capacitor and an operational amplifier shown in FIG.

Next, a third embodiment of the present invention will be described with reference to FIG. The difference between the timer switch shown in FIG. 6 of the third embodiment and the timer switch shown in FIG. 1 is that the switching section 57 composed of an operation switch and a transistor is used instead of the latching relay of the first embodiment. Has been established. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

The switching section 57 is connected between the positive terminal of the DC output of the rectifier circuit 81 and the + V potential line.
An operation switch 59 of the same type as the operation switch 15 is connected in series via a resistor 58, and an emitter / collector of a transistor 60 is connected between an input terminal of the resistor 58 and an output terminal of the operation switch 59. It is connected.
A resistor 6 is connected between the emitter and the base of the transistor 60.
1 is connected, and the base is connected to the E potential line via the resistor 62 and the collector / emitter of the transistor 63. The constant voltage diode 20 and the electrolytic capacitor 21 are provided between the + V potential line and the E potential line.
Are connected in parallel. The base of the transistor 63 is connected to the output collector of the transistor 29 of the timer section 28 via a resistor 64.

Next, the operation of the timer switch according to the third embodiment will be described with reference to FIG. When the operation switch 59 is turned on, the DC output of the rectifier circuit 81 is supplied to the electrolytic capacitor 2 via the resistor 58 and the operation switch 59.
Charge 1. The electrolytic capacitor 21 is charged to the potential + V regulated by the constant voltage diode 20, and raises the potential + V on the + V potential line. The rising of the + V potential line drives the timer section 28 and starts the timer. By the driving of the timer section 28, the transistor 29 is turned on under the control of the timer IC 31, and the collector output becomes H level,
The thyristor 11 is turned on via the gate resistor 37, and the base of the transistor 63 of the switching section 57 is turned on at H level via the resistor 64.
By turning on the thyristor 11, the rectifier circuit 8 is turned on.
1 performs a rectifying operation based on an AC input supplied from an AC power supply, a gate current flows through a gate resistor 79 to turn on a triac 80, and AC power supply to a load is maintained and the switching unit 57 is switched. When the transistor 63 is turned on, the transistor 60 is also turned on, and the DC output from the rectifier circuit 81 is continuously supplied to the electrolytic capacitor 21 even though the operation switch 59 is turned off. The generation of the potential + V is continuously maintained.

Next, the timer IC of the timer unit 28
A time count is performed at 31 and when a predetermined time has elapsed, the OUT terminal goes high, the transistor 29 turns off, and the collector output of the transistor 29 goes low. As a result, the thyristor 11 is turned off, the triac 80 is turned off, and the base of the transistor 63 of the switching unit 57 is also at the L level. This transistor 63 is turned off, and the transistor 60 is also turned off. The supply of the DC output from the rectifier circuit 81 to the capacitor 21 is stopped. As a result, the operation of the timer switch of the load connected to the AC power supply is stopped.

Note that the timer unit 3 of the third embodiment
It is also possible to replace 8 with a timer section comprising a comparator composed of general-purpose logic such as a resistor / capacitor and an operational amplifier shown in FIG.

Next, a fourth embodiment of the present invention will be described with reference to FIG. As in the above-described second embodiment, an operation switch is provided on the AC input side of the rectification output circuit 81, and a photocoupler is used instead of the latching relay. 1 to 6 are denoted by the same reference numerals, and detailed description is omitted.

An operation switch 65 of the same type as the switch 59 is connected between a terminal 74 connected to the AC power supply and an AC input terminal of the rectifier circuit 81. , The two ends on the light receiving side of the photocoupler 66 are connected. A + V potential line is connected to an input terminal on the light emission side of the photocoupler 66 via a resistor 67, and an output terminal on the light emission side is connected to the E potential line via a collector / emitter of a transistor 68. I have. The base of the transistor 68 is connected to the collector of the transistor 29 of the timer section 28 via a resistor 69.

The operation of the timer switch having such a configuration will be described with reference to FIG. When the operation switch 65 is turned on, an AC input is supplied from the AC power supply to the rectifier circuit 81 to perform a rectification operation. The DC output of this rectifier circuit 81 is
When the transistor 18 is turned on, the electrolytic capacitor 2
1 is charged to the potential + V regulated by the constant voltage diode 20, and the potential + V rises on the + V potential line. The rise of the + V potential line causes the timer section 28
Starts, the timer IC 31 starts the timer, and the OUT terminal is set to the L level. The transistor 29 is turned on by the L level of the OUT terminal, and
The thyristor 11 is turned on via the gate resistor 37, and the base of the transistor 68 is also at the H level, so that the transistor 68 is turned on. When the transistor 68 is turned on, operating power is supplied to the light emitting side of the photocoupler 66 from the + V potential line, and the photocoupler 66 is also turned on. Thereby, the photocoupler 66, the rectifier circuit 81, the thyristor 1
1, supplied to the load via the rectifier circuit 81, the gate resistor 79, and the coil 78, the triac 80 is turned on, and the load is continuously driven. Further, the transistor 1
8 also maintains the ON operation, and the potential + V is generated and maintained on the + V potential line.

Next, the timer IC of the timer section 28
At the time-up when the timer count of the timer 31 ends, the OUT terminal of the timer IC 31 becomes H level,
The transistor 29 is turned off. This transistor 29
Is turned off, the collector output goes low, the gate of the thyristor 11 and the base of the transistor 68 go low through the gate resistors 37 and 69, and both the thyristor 11 and the transistor 68 are turned off. And Triac 80 are both turned off,
The AC power supply to the load is stopped, and the operation of the timer switch is also stopped.

In the fourth embodiment, the timer section 28 can be replaced with a timer section including a comparator using general-purpose logic such as the resistor / capacitor and the operational amplifier described with reference to FIG. is there.

In each of the above-described embodiments of the present invention,
Although a ventilating fan is used as an example of the load connected to the AC power supply, it can be replaced with an illumination lamp.

As described above, the timer switch of the present invention uses an operation switch that turns on the switch contact when the switch button is pressed, and turns off the switch contact when the switch button is released. After driving the connected load, the drive of the load is continued until a predetermined time elapses, and after the time-up, the AC power supply to the load is stopped, and the drive of the timer switch can be stopped. The timer section can be configured with a general-purpose timer IC or a logic circuit, and can manage the load-driven timer reliably at low cost.

[0066]

According to the present invention, there is provided a timer switch for controlling a driving force supply from a driving source to a load and controlling a driving time of the load, wherein a timer unit of the timer switch is a comparator using a general-purpose timer IC or a logic circuit. It is possible to use an operation switch that is turned on only when the switch button is pressed for instructing the supply of the driving force to the load.

The operation switch can be arranged on the connection side between the AC power supply and the load, or can be arranged in the rectified DC circuit that generates the driving source for the timer switch, so that the installation location of the load can be set. According to, the arrangement of the operation switch and the timer switch can be selected.

This eliminates the need for developing a timer program for the timer switch, and has the effect of reducing costs and reducing power consumption when the timer switch is not driven by using general-purpose electronic components. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a timer switch according to the present invention.

FIG. 2 is an explanatory diagram illustrating an operation of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a modification of the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a second embodiment of the timer switch according to the present invention.

FIG. 5 is an explanatory diagram illustrating the operation of the second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a third embodiment of the timer switch according to the present invention.

FIG. 7 is an explanatory diagram for explaining the operation of the third embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a fourth embodiment of the timer switch according to the present invention.

FIG. 9 is a block diagram showing a configuration of a conventional timer switch.

[Explanation of symbols]

11 ... Thyristor 12, 14, 19, 24, 26, 30, 32, 34, 3
7, 79: Resistor 13, 33, 35, 77: Capacitor 15: Operation switch 16: Relay contact for latching relay 17: Set coil for latching relay 18, 23, 29 ... Transistor 20: Constant voltage diode, 21, 27 ... Electrolytic capacitor 22 ... Reset coil for latching relay 25 ... And gate circuit 28 ... Timer section 31 ... Timer IC 76 ... Surge suction element 78 ... Line noise suppression coil 80 ... Triac 81 ... Rectifier circuit

Claims (10)

[Claims] 1. A load control switching means disposed between an AC power supply and a load, a start-up power supply having an operation switch for starting the load control switching means, and a start-up power supply A timer switch, comprising: timer means for turning on the load control switching means and the start-up power supply means for a predetermined time when an operation switch is turned on. 2. The switching means for load control includes: a triac connected to an AC power supply via a load; a rectifier circuit connected to both ends of the triac; and a switching connected to a DC output terminal of the rectifier circuit. The timer switch according to claim 1, further comprising: an element. 3. The start-up power supply means includes: a switch means comprising an operation switch and a latching relay connected to a DC output of the rectifier circuit; and the rectifier when the operation switch of the switch means is turned on. A low-voltage power supply unit that turns on a latching relay based on a DC output from the circuit, and generates a low voltage, and after a lapse of a predetermined time set by the timer unit, a switching element at a DC output terminal of the rectifier circuit. The timer switch according to claim 1, further comprising control means for turning off the latching relay. 4. The start-up power supply means includes: an operation switch connected to a DC output of the rectifier circuit; a switch means including a transistor switch arranged in parallel with the operation switch; A low-voltage power supply unit that turns on the transistor switch based on the DC output of the rectifier circuit and generates a low voltage when the switch is turned on, and a predetermined time set by the timer unit elapses. 2. The timer switch according to claim 1, further comprising: turning off a switching element at a DC output terminal of the rectifier circuit and the transistor switch. 5. A triac connected to an AC power supply via a load, a rectifier circuit connected to both ends of the triac via latching relay contacts, an operation switch and a latching relay coil connected to both ends of the triac. A load control switch means comprising: a switching element connected to a DC output terminal of the rectifier circuit; and a low voltage power supply means for generating a low voltage based on a DC output of the rectifier circuit of the load control switch means. And a timer means for starting a timer by starting a low voltage generated by the power supply means, and turning on an operation switch of the load control switch means. In response to the above, the latching relay contact is turned on, and the low-voltage power source Generating, starting the timer by the timer means, turning on the switching element at the DC output terminal of the rectifier circuit, and latching the load control switch means after a lapse of a predetermined time set by the timer means. A timer switch for turning off a relay contact and a switching element at a DC output terminal of the rectifier circuit. 6. A latching relay coil connected to both ends of a triac of the load control switch means has a set coil and a reset coil for turning on / off the latching relay contact, and the set coil is an operation switch. The reset coil is arranged in series with a photocoupler, and turns on a relay contact with the set coil by turning on the operation switch, and after a lapse of a predetermined time set by the timer means, 6. The timer switch according to claim 5, wherein a latching relay contact is turned off by said reset coil via said photocoupler based on a control signal from timer means. 7. A triac connected to an AC power supply via a load, a rectifier circuit connected to both ends of the triac via an operation switch, and a switching element connected to a DC output terminal of the rectifier circuit. Load control switch means, and a start-up power supply means having a low-voltage power supply means for generating a low voltage based on a DC output of a rectifier circuit of the load control switch means. Timer means for starting a timer by the rise of the low voltage, a photocoupler connected in parallel to an operation switch of the load control switch means, and the photocoupler based on a control signal from the timer means. And switch means comprising a photocoupler control means for performing on / off control, and an operation switch of the load control switch means. In response to a switch-on operation, a low-voltage generation in the low-voltage power supply means of the power supply means for starting, a start of a timer in the timer means, a switching element of a DC output terminal of the rectifier circuit, and A timer switch, wherein the switch means is turned on, and after a predetermined time set by the timer means elapses, the switch means and the switching element are turned off based on a control signal from the timer means. 8. An operation of turning off a latching relay provided in either the load control switch means or the start-up power supply means, based on a time-up signal from the timer means, a reset coil of the latching relay. 7. The timer switch according to claim 3, further comprising control means for controlling an exciting current supplied to the timer switch. 9. The timer switch according to claim 1, wherein said timer means comprises a general-purpose timer integrated device. 10. The timer switch according to claim 1, wherein said timer means comprises a comparator circuit including a CR charge / discharge circuit and an operational amplifier.