JPH0351876Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a timer circuit used for turning on and turning off the power of equipment.

[Conventional technology]

In general, in a timer circuit used for turning on or turning off the power of a device, the time to be measured is often set by manual operation of a setting knob of a time setting mechanism such as a clockwork timer.

However, since this type of time setting mechanism is mechanical, there is a high risk of damage during use, lacks reliability, and has poor time setting accuracy.

Therefore, the servo mechanism is driven in response to changes in analog quantities such as the output voltage and output current of the time setting power supply, and this drive changes the resistance value of the time setting variable resistor, and the time setting of the timer circuit is electrically controlled. It is considered to be carried out in

[Problem that the invention attempts to solve]

By the way, in the case of the above-mentioned timer circuit that sets the time electrically, a circuit that converts changes in analog quantities such as the output voltage and output current of the time setting power supply into signals for driving the servo mechanism is required. The problem is that the mechanism is complicated and expensive.

[Means for solving problems]

The present invention has been made with the above points in mind, and includes an actuation switch whose one end is connected to one output terminal of the main DC power supply, and the other end of the actuation switch and the other output of the main DC power supply. A series circuit including a first relay, which is provided between the terminal and the first relay and which changes to start and stop operation depending on whether the operating switch is turned on or off, and a backflow prevention diode, is connected to the first relay.
a second relay that is connected in parallel to the relay and starts operating and generates a timer output when the actuation switch is turned on; and a second relay that is connected in parallel to the second relay and that is injected with the main DC power when the actuation switch is turned on to perform charging. a first capacitor that maintains the second relay in an operating state when the operating switch is turned off; an auxiliary DC power supply whose output voltage is variably set; and a first capacitor connected to one output terminal of the auxiliary DC power supply. It has a charging contact and a discharging contact connected to the injection side end of the first capacitor, and when the first relay starts and stops operating, the discharging contact is switched to the charging contact, and the charging contact is switched to the discharging contact. a switching means that switches between the switching means, the switching piece, and a connection point of the other output terminal of the two DC power sources, and that switches the second relay after the first relay stops operating by turning off the operating switch; The present invention provides a timer circuit including a second capacitor for determining the stoppage of operation for a predetermined period of time.

[Effect]

In the case of the timer circuit of the present invention configured as described above, when the operating switch is turned on, the relay coils of the first and second relays are excited by the main DC power supply, and the first and second relays start operating. A first capacitor is charged.

Further, by switching the switching means by starting the operation of the first relay, the second capacitor is connected to the auxiliary DC power source and charged.

Next, when the operating switch is turned off, the first relay immediately stops operating, but the second relay
The discharging of the capacitor prevents the instantaneous operation stop when the capacitor is turned off, and the charging voltage of the second capacitor is applied to the relay coil of the second relay by switching the switching means, so that the second relay continues to be kept in the operating state.

Then, when the voltage across both capacitors drops to the return voltage of the second relay, the second relay stops operating, and the stopping of the second relay due to turning off the operating switch is delayed for a predetermined period of time. The timer operates using electrical time settings without using complicated and expensive conversion circuits.

〔Example〕

One embodiment will be described with reference to FIGS. 1 and 2.

In FIG. 1, 1a and 1b are first and second terminals connected to one and the other positive and negative output terminals of a main DC power source (not shown), and 2 has one end connected to the first terminal 1a. is an actuation switch connected to the

3 has both ends connected to switch 2 via connection terminals A and B.
A first relay is connected to the second terminal 1b at the other end, and is connected to the main DC power supply via a switch 2, and starts operating when the switch 2 is turned on or off.
It will stop working.

4 is a backflow prevention diode whose anode is connected to the other end of the switch 2, and 5 is a diode 4 whose one end is connected to the other end of the switch 2.
A series circuit with a diode 4 is connected in parallel to the first relay 3, and starts operating when the switch 2 is turned on.

6 is a first current limiting resistor whose one end is connected to the cathode of the diode 4; 7 is a first capacitor whose both ends are connected to the other end of the first resistor 6 and the connection terminal B; 8;
is a third terminal to which the positive output terminal as one output terminal of the auxiliary DC power supply 14 of variable output voltage type is connected.

9 is a second current-limiting resistor whose one end is connected to the third terminal 8 via the connecting terminal C; 10 is a discharging contact; first and second contacts 10a and 10b are the first and second resistors 6 as charging contacts; . 11 is a switching piece 10 with relay contacts 10 on both ends.
c. A second capacitor connected to the connection terminal B, which is charged while the first relay 3 is operating, and starts discharging after the first relay 3 stops operating, and stops the operation of the second relay 5 when the switch 2 is turned off. is delayed for a predetermined period of time.

Reference numerals 12a and 12b are an a contact and a b contact for timer output of the second relay 5, each of which is a time-limiting contact, and one end thereof is connected to the connection terminal D, and the other end is connected to the connection terminals E and F.

In addition, both relays 3 and 5, diode 4, both resistors 6 and 9, both capacitors 7 and 11, and each contact 10 and 1
2a and 12b form a circuit section 13 indicated by a chain line, and this circuit section 13, the switch 2, and the auxiliary DC power supply 14 constitute a timer circuit indicated by a chain line.

Further, the negative output terminal as the other output terminal of the auxiliary DC power supply 14 is connected to the second terminal 1b.

Next, the operation of the embodiment will be explained.

Now, when the switch 2 is turned on at time t1 as shown in FIG. When the voltage exceeds the relay operating voltage, the first and second relays 3 and 5 start operating.

Then, as shown in FIG. 2b, at time t2, which is slightly delayed from time t1, the switching piece 10c of the C contact 10 of the first relay 3 changes from the first contact 10a to the second contact 10.
b, the second contact 10b is turned on, the second capacitor 11 is connected to the auxiliary DC power supply 14 via the c contact 10 and the resistor 9, and charging of the second capacitor 11 is started.

In addition, as shown in FIG. 2c, when the switch 2 is turned on, the second
The a contact 12a and the b contact 12b of the relay 5 are turned on and off, respectively, and charging of the first capacitor 7 is also started via the diode 4 and the resistor 6.

Then, while the switch 2 continues to be on, both relays 3 and 5 are held in the operating state, both capacitors 7 and 11 continue to be charged, and the second capacitor 11 continues to be charged.
The voltage across the terminal gradually increases to the full charge voltage as shown in FIG. 2d.

Note that the voltage across the relay coil of the second relay 5 rises sharply at time t1 as shown in FIG.
The rated value Er is reached.

Then, as shown in FIG. 2a, when the switch 2 is turned off at time t4, the supply of electricity to the first and second relays 3 and 5 by the main DC power source is stopped.

At this time, the first relay 3 immediately changes to stop operating, but the first capacitor 7 discharges via the resistor 6 and the second relay 5 at the same time as the energization stops, so the second relay 5 is maintained in the operating state. .

Furthermore, based on the deactivation of the first relay 3, as shown in FIG.
is switched from the second contact 10b to the first contact 10a, and the second capacitor 11 is connected in parallel to the first capacitor 7.

The discharge of both capacitors 7 and 11 causes the second relay 5 to continue to be maintained in its operating state.

Next, the voltage across the relay coil of the second relay 5 gradually decreases as both capacitors 7 and 11 are discharged, and when it drops to the relay return voltage at time t6, the second relay 5 stops operating, as shown in 2c. As shown, the a contact 12a and the b contact 1 of the second relay 5
2b are turned off and on at time t6, respectively.

Therefore, the deactivation of the second relay 5 due to the turning off of the switch 2 is delayed by the time T from time t4 to time t6 by both capacitors 7 and 11, and a timer operation is performed.

By variable setting the output voltage of the auxiliary DC power supply 14, the voltage across the second capacitor 11 at the start of discharge, that is, at time t5, can be freely set. As shown in , when the value Ec is set lower or higher than the value Ec shown by the solid line, the time from the start of discharging of both capacitors 7 and 11 until the voltage across the relay coil of the second relay 5 reaches the relay return voltage Et is The time T changes from shorter to longer than the time T shown in e of the figure.

Therefore, by variably setting the output voltage of the auxiliary DC power supply 14, it is possible to
The time until the relay 5 stops operating can be continuously varied and set.

Note that the resistors 6 and 9 are for preventing rush current, and may be omitted.

[Effect of idea]

As described above, according to the timer circuit of this invention, by variably setting the output voltage of the auxiliary DC power supply 14 and variably setting the charging voltage of the second capacitor 11, the second relay is activated after the operating switch 2 is turned off. It is possible to freely adjust the time required for the voltage across the relay coil 5 to reach the reset voltage, and to continuously vary and set the timer operation time from turning off the switch 2 to stopping the operation of the second relay 5. I can do it,
By combining the relays 3, 5 and the capacitors 7, 11, a simple and inexpensive configuration can provide a timer circuit with electrical time setting, and its effects are remarkable.

[Brief explanation of the drawing]

The drawing shows one embodiment of the timer circuit of the present invention,
FIG. 1 is a wiring diagram, and FIGS. 2 a to 2 e are timing charts for explaining the operation. 2... Operating switch, 3, 5... First and second relay, 4... Backflow prevention diode, 7, 11... First and second capacitor, 13... Circuit section, 14... Auxiliary DC power supply.

Claims (1)

[Claims for Utility Model Registration] An actuation switch having one end connected to one output terminal of the main DC power supply, and an actuation switch provided between the other end of the actuation switch and the other output terminal of the main DC power supply, The first relay is a series circuit consisting of a first relay that starts and stops operating depending on whether the operating switch is turned on or off, and a backflow prevention diode.
a second relay that is connected in parallel to the relay and starts operating and generates a timer output when the actuation switch is turned on; and a second relay that is connected in parallel to the second relay and that is injected with the main DC power when the actuation switch is turned on to perform charging. a first capacitor that maintains the second relay in an operating state when the operating switch is turned off; an auxiliary DC power supply whose output voltage is variably set; and a first capacitor connected to one output terminal of the auxiliary DC power supply. It has a charging contact and a discharging contact connected to the injection side end of the first capacitor, and when the first relay starts and stops operating, the discharging contact is switched to the charging contact, and the charging contact is switched to the discharging contact. and a switching means that is provided between a switching piece of the switching means and a connection point of the other output terminal of the two DC power supplies, and that switches the second relay after the first relay stops operating by turning off the operating switch. and a second capacitor for delaying deactivation for a predetermined period of time.