JPS58127304A - Driving method of electromagnetic solenoid - Google Patents

Abstract

PURPOSE:To prevent the production of any operation noises in attraction and reset operations and obtain a vibration proof effect, by a method wherein a clock signal is frequency-divided to form a plurality of timing signals having respective duties properly different from each other, and the voltage applied to the solenoid is changed over in accordance with the signals. CONSTITUTION:A counter 1 frequency-divides a clock signal CK to form signals A, B, C different from each other. Output lines 2A, 2B, 2C of a CPU2 for controlling the drive of a solenoid 3 control ON-OFF of AND gates G3, G4, G5 for specifying the drive of 1/8, 1/4, 1/2 duties, respectively. In driving the solenoid 3, the controller 2 successively changes over the duties, 1/8 1/4 1/2 1/1 1/2, to raise the voltage stepwisely. Thereafter, in the hold state of the solenoid 3, a signal is delivered to the output line 2C to specify the solenoid 3 to be driven by the 1/2 duty. On the other hand, in the shutoff operation of the solenoid 3, the duties are changed over reversely to the above, 1/2 1/4 1/8, to lower the voltage stepwisely, and the output lines of the controller 2 are changed over as follows: 2C 2B 2A. By this control, it is possible to obtain voltage characteristic similar to that shown in the Figure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving an electromagnetic solenoid, and in particular, a method for preventing operation noise and vibration damping during suction and return by gradually increasing and then lowering the voltage applied to the solenoid over time. 0 Conventionally, electromagnetic solenoids are driven by applying a constant voltage of 0 N at a time.
Since this is carried out by turning off the solenoid, the suction and return operations become rapid, and the generation of operating noise of the solenoid itself, operating noise of the mechanical parts connected to the solenoid, and vibrations cannot be avoided.

Furthermore, the greater the output of the solenoid, the greater the operating noise and vibration.

Therefore, when using a solenoid in precision equipment, there are problems such as loss of accuracy due to vibration during operation, and in the case of office equipment, there is a problem of operating noise, which limits the use of solenoids with relatively low output.

The present invention is a method of driving a solenoid that solves the above problem, and avoids sudden changes in the output of the solenoid, and gradually increases the voltage applied to the solenoid over time as shown in the voltage characteristics shown in Figure 1. It is also driven downward.

H in Figure 1 indicates the holding period.However, the voltage characteristics shown in Figure 1 can be obtained by connecting a capacitor in parallel to the solenoid, but there are problems with the current capacity of the power supply, etc. Not the point.

Therefore, in the present invention, a drive circuit as shown in FIG. 2 is configured to obtain the voltage characteristics shown in FIG. 5.

To explain the circuit configuration of FIG. 2, numeral 1 is a counter that divides the clock signal CK to create different signals A and BSC, respectively. The waveform is shown in FIG.

The output signals A and B from the counter are connected to an AND gate G.
1 and shows the redundancy (AX
Obtain the output of B).

In addition, the output signal C from the counter and the analog game) G,
The output from is inputted to AND gate G2 and outputs 4 AUUTIES (AX'BXC) shown in Fig. 4 (1).
get the output of

1-- The output signal of 4-1 from the gate G is also applied to one input terminal of the AND gate G4, and the output signal of 4-1 from the gate G2 is applied to the AND gate G3. The 4-to-1 signal B from the counter is also applied to one input terminal of the AND gate G5.

Control device (CPU) that controls the drive of the two solenoids 3
and output lines 2A, 2B applied to the other input terminals of the AND gates 03 to G5.

2C and an output line 2D input to OR gate G6.

- The output line 2A controls the AND gate G3 ON-OFF in order to instruct the driving of the 4 duties, and the output line 2B controls the AND gate G3 ON-OFF in order to instruct the driving of the duty. Further, the output line 2C controls the controller 1'G5 to turn ON and OFF in order to instruct the driving of the 4 utilities.

Each output of the AND gates 03 to G5 is an or game) Ga
The output signal of Gs is input to the OR gate G6 of the output line 2D from the CPU; is being applied.

By the way, the control device (CPU) 2 is equipped with a program for switching each game to obtain the voltage characteristics shown in FIG.
An output signal is derived.

The operation of the circuit shown in FIG. 2 to obtain the voltage characteristics shown in FIG. 5 will be described below.

When the solenoid 3 is driven, the control device 2 performs 1/→→
The voltage is increased stepwise by switching 4212 in sequence from →1/→1/(de-ty). This is done by first outputting an instruction signal to the output line 2A of the control device 2, turning on the ant gate (G3), and applying it to the drive transistor 4 via the ant gate, so that the voltage M corresponding to this /81 3 is applied. Next, control device-2
output line 2A to output the instruction signal to output line 2B.
is 0FF), and AND gate G4 is turned ON.

Applying a signal of duty from 0 to the drive transistor 4, the control device 2 subsequently applies the signal on the output line 2C to the drive transistor 4.
(output line 2B is 0FF), and the AND gate G4 is turned on to apply the signal B of -4 utility to the drive transistor 4. After that, the control device 2 outputs a signal to the output driver 2D, and keeps the drive transistor 4 in the ON state via the OR gate G6.
In other words, the utility is driven.

In this manner, after increasing the voltage in stages, when the solenoid 3 is in the holding state, an instruction signal of 1-- is output to the output line 2c, and the motor is driven at 4-I.

2, the output line of the control device 2 is switched from 2C to 2B to 2A.

Through this control, the voltage characteristics shown in FIG. 5 are obtained, which are similar to the voltage characteristics shown in FIG.

As described above, in the present invention, a lock signal is appropriately frequency-divided to create a plurality of timing signals of a certain duty as appropriate, and these timing signals are switched, and corresponding to the timing signals, the signals are sent to solenoles d and d. The applied voltage is switched so that the voltage applied to the solenoid is gradually increased and then gradually decreased over time, thereby preventing operational noise and vibration during suction and return.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the applied voltage characteristics for driving the solenoid, Fig. 2 is a diagram showing the solenoid drive circuit of the present invention, and Fig. 3 is a diagram showing the applied voltage characteristics for driving the solenoid.
4 and 4 are time charts of each signal in FIG. 2, and FIG. 5 is a diagram showing applied voltage characteristics according to the present invention.

Claims (1)

[Claims] 1. Divide the frequency of a certain clock signal to create multiple timing signals with different duties as appropriate, switch these timing signals, apply voltages corresponding to these timing signals to the solenoid, and gradually increase the voltage applied to the solenoid over time. A method of driving an electromagnetic solenoid, characterized in that the solenoid is raised and gradually lowered to perform a suction operation and a return operation.