JPH0126084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load switching device that can be used to switch the operation of a plurality of loads such as automobile lights, wipers, and blower motors for air conditioners.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple load switching device that can switch the load one step at a time by operating a switch within a predetermined time, or can skip steps by operating a switch for more than a predetermined time. be.

The present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram of one embodiment of the present invention.

Momentary switches 1 and 2 are in the on state while they are operated, and automatically return and turn off when the operation is stopped, and the outputs of momentary switches 1 and 2 drive the pulse oscillator 4 through the OR gate 3. . Further, the output of the momentary switch 1 passes through a differentiating circuit 5 to trigger a monostable multivibrator 6.
A signal obtained by inverting the output of the monostable multivibrator 6 by an inverter 7 and an output pulse of the pulse oscillator 4 are input to an AND gate 8. and gate 8
The output signal of the differential circuit 5 and the output signal of the differentiating circuit 5 are input to the OR gate 9. The output of the OR gate 9 is input to an AND gate 10, and the output of the AND gate 10 is input to an up count input terminal of an up/down counter 11. Up/down counter 11
The output signal of the output terminal Q ₃ of is inverted through the inverter 12 and input to the AND gate 10 .

On the other hand, on the momentary switch 2 side, similarly, the output of the momentary switch 2 is passed through the differentiating circuit 13 to the monostable multivibrator 14.
trigger. A signal obtained by inverting the output of the monostable multivibrator 14 by an inverter 15 and an output pulse of the pulse oscillator 4 are input to an AND gate 16. Output signal of differentiating circuit 13 and AND gate 16
The output signal is input to the OR gate 17. The output of the OR gate 17 is input to the AND gate 18, and the output of the AND gate is input to the down count input terminal of the up/down counter 11. The output signal of the output terminal _Q0 of the up/down counter 11 is passed through the inverter 19 to the AND gate 18.
Enter.

The output signals of the output terminals Q ₀ , Q ₁ , Q ₂ , and Q ₃ of the up/down counter 11 are input to the drivers 20 , 21 , 22 , and 23 separately. , 23 are inputted to loads 25, 26, and 27, respectively, and also to display lamps 28, 29, 30, and 31.

In this embodiment configured as described above, when the momentary switch 1 is turned on for a time longer than the set time _T1 of the monostable multivibrator 6, that is, as shown in FIG. is triggered through to produce an output for a time T ₁ as shown in FIG. 2b.
At the same time, the pulse oscillator 4 is driven through the OR gate 3 to generate an output during the ON period of the momentary switch 1, as shown in FIG. 2c. However, the output of monostable multivibrator 6 is
, the AND gate 8 is closed, and the output pulse of the pulse oscillator 4 is not output from the AND gate 8.

On the other hand, the output of the differentiating circuit 5 is outputted to an AND gate 10 through an OR gate 9. At this time, the output of the output terminal _Q3 of the up/down counter 11 is at a low potential, so it is inverted through the inverter 12, the AND gate 10 is open, and the up/down counter 11 counts the output of the differentiating circuit 5, /down counter 11 output terminal Q ₀
becomes a high potential output, and the indicator lamp 28 lights up to indicate this.

Then, when the time _T1 has elapsed, the AND gate 8 is opened and the output pulse of the pulse oscillator 4 is outputted from the AND gate 8 as shown in FIG. 2d. The output pulse of the pulse oscillator 4 output from the AND gate 8 is output from the OR gate 9 and the AND gate 10.
The up/down counter 11 is input to the up/down counter 11 through its output terminal.
Q ₁ to Q ₂ and Q ₃ sequentially become high potential outputs.
Therefore, the load is switched from load 25 to load 26 to load 27 every output pulse. This state is as shown in FIG. 2e. Up/down counter 1
When the output terminal Q ₃ of No. 1 becomes a high potential output, the AND gate 10 is closed and the load 27 remains driven. That is, when the momentary switch 1 is turned on for more than a time _T1 , the load 25,
26 and 27 are sequentially switched and driven, and the final load 27 continues to be driven. Furthermore, after the output terminal Q ₃ becomes a high potential output, the AND gate 10 is closed, and the up/down counter 11 counts the output pulses of the pulse oscillator 4 even if the momentary switch 1 is on for a longer period of time. There's nothing to do.

Also, if the momentary switch 2 is turned on for a longer time than the set time T ₂ of the monostable multivibrator 14 from this state, the load 27 will be driven for the time T ₂ from when the momentary switch 2 is turned on, as described above. Then, after the elapse of time _T2 , the loads 26 and 25 are sequentially switched and driven.
When the output of the output terminal _Q0 returns to the low potential output, the AND gate 18 closes, and even if the momentary switch 2 continues to be on, the up/down counter 11 will continue to count the output pulses of the pulse oscillator 4. There isn't.

Therefore, if the oscillation frequency of the pulse oscillator 4 is selected to be large, this switching can be done almost instantaneously.

Next, set momentary switch 1 to time T ₁ .
If it continues to be on for a shorter period of time,
The AND gate 8 will not open due to the output of the monostable multivibrator 6, and the up/down counter 11 will count up the output of the differentiating circuit 5, and every time the momentary switch 1 is turned on, the load 2 will be
It switches in the order of 5, 26, and 27. If the ON state is turned on three times or more, the AND gate 10 is closed and has no relation to load switching.

In addition, if momentary switch 2 is kept on intermittently for a time shorter than time T ₂ in the same way as momentary switch 1, then load 2
It is switched in the order of 7, 26, 25. If the ON state is turned on three times or more, the AND gate 18 is closed and has no relation to load switching.

It should be noted that the momentary switches 1 and 2 do not need to be provided independently; for example, they may be a toggle switch, a rotary switch, or a lever switch that can be turned on and off by a single switch, in other words, a switch that has momentary contacts. Alternatively, the load may be stopped by turning off a power switch or the like.

The above switching circuit is used to switch small automobile lights, headlights _L0 , headlights Hi, etc.
It can be used to change the moving speed of automobile wipers and the rotation speed of automobile air conditioner blower motors.

In addition, when used in the above cases, when you want to maximize the wiper movement speed immediately at the start of driving when heavy rain suddenly occurs, when you want the headlight to have the maximum luminous flux immediately at the start of driving at night, and when you start driving under the scorching sun. This is extremely effective when you want the blower motor to reach its maximum rotation speed immediately.

Further, although the above description has been made using the respective integrated functional parts, the same thing can be done using a microcomputer.

As explained above, according to the present invention, the load can be switched one step at a time by operating the switch within a predetermined time, or the load can be switched to a desired load by jumping over steps by operating the switch for more than a predetermined time.

Further, the switch can be made smaller and simpler, and the space required is also reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
The figure is a diagram for explaining the operation of an embodiment of the present invention. 1 and 2... momentary switch, 4...
...Pulse oscillator, 5 and 13...Differential circuit, 6
and 14...monostable multivibrator, 11
...up/down counter, 25, 26, 27
……load.

Claims (1)

[Claims] 1. In a load switching device that sequentially switches and drives a plurality of loads, a first switch that is turned on only when an operation is being performed to drive the load is switched on in a certain order for each operation within a first fixed time. a second switch that is turned on only when the load is being operated in order to switch and drive the load, and to switch the load all at once to the final load by operating the switch for a period exceeding the first predetermined time, and to stop the load; The loads are sequentially switched and driven in the reverse order of the predetermined order for each operation within a second predetermined time, and the load is switched all at once by operating the switch after the second predetermined time. A load switching device featuring: