JPS5956711A - Coil current supplying circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to an electric circuit that carries a current of 11+11# in a coil;
In particular, it relates to an electrical circuit in combination with an electromagnet having a coil connected to a DC power supply.

(2) Background and Summary of the Invention When the electromagnet or solenoid of a Reno diversion valve is energized, a magnetic force is generated as a reaction, but this is not necessarily desirable. To avoid this reaction, a so-called ramp circuit is used, ie a circuit that supplies a linearly increasing voltage to the electromagnet, but the magnet is usually of the proportional type. In this method, the number of circuit elements increases, and therefore it is necessary to incorporate them into a printed board, resulting in a high-quality image and a large volume.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to create an electrical circuit which is capable of supplying current to a coil, in particular the coil of a solenoid of a switching valve, and which makes it possible to operate this switching valve without reaction.

Furthermore, it is an object of the present invention to provide a circuit for supplying current increasing in a slope or ramp shape, which can be obtained at a low cost.
It is also about building J.

Furthermore, it is an object of the present invention that the components of this circuit are
The idea is to create a circuit that supplies an increasing current in the form of a slope or ramp that is housed within one plug.

According to the invention, one of the terminals of the power supply line is connected to the coil of the electromagnet via a gravity type MO8Fr shoulder transistor, the control line of this transistor being connected to the other terminal of the power supply line together with a first resistor. Further, the open side 1 line is connected to the first terminal of the power supply line via a capacitor.

The ramp time to reach the required voltage from OV is 100 to 500 ms depending on the value of the first resistor and capacitor.
This is a common case, and ramp times in seconds can also be achieved. The control voltage does not increase linearly, but mostly as an exponential function with a negative power, which is often sufficient. Due to the small space requirement, these circuit elements can be integrated into one plug. Therefore, it is not difficult to retrofit the existing system.

The present invention can be further developed by scattering a second resistor in the 51f column in the capacitor, and this resistance value is equal to the value of the first resistor.
It is necessary to increase the value by about 1/6 of the value of the resistor.

Hereinafter, the present invention will be explained as an example with reference to the circuit diagram in Appendix 1.

(3) Detailed Description The first and second conductors or inlets 1 and 2d1 supply current to the coil 3 of an electromagnet or solenoid that is a component of a hydraulic switching valve (not shown).

On line 1, power type MO8, FET transistor 4
is connected, the internal resistance of which is 15 ohms, and there is virtually no residual voltage.

The side electrodes vj1 and jbU of the transistor 4 are connected to the control line 5, to which the first resistor 6 is also connected. This control line 5 is connected to the line 1 through the capacitor 1 and the second resistor 8 which is connected in series with the capacitor 1 and the zener tie auto 9 which is connected in parallel with these. The resistor 6 changes from I KΩ to IMΩ.
This value can be adjusted. Capacitor value d2
．． It is in the range of 10 μJ' and 5,000 μF. The value of resistance 6 is approximately 1/6 of the value of resistance 6.

The terminals of control line 5, line 1 and line 2 are designated by symbols 10, 11 and 12, respectively. To start the operation of this circuit, terminal 1o
and switching means for connecting the terminals 12. (Not shown) The use of this circuit is as follows. Normally, terminal 11
is Ov, and the trench terminal 12 is 24V. Switching valve (
Terminal 10 is connected to 24V by switching means (not shown). The ImoC coupling 6.7 causes the voltage at one electrode of the transistor 40 to increase in a ramp waveform represented as an exponential function of a negative power. As a result,
The resistance of transistor 4 decreases. The current flowing through lines 1 and 2 will therefore increase and the magnetic force of the solenoid will increase. Although the increase in magnetic force is not strictly linear, if it is close to a linear ramp waveform, this is sufficient in normal applications since it is normal for the hydraulic load connected to the switching valve to be turned on and off smoothly. It is.

When the terminal 10 is set to OV, the voltage of the control electrode decreases in a ramp-like manner, and the resistance of the transistor 4 increases accordingly.

Similarly, the current in the coil 3 decreases and therefore the magnetic force also decreases.

When a voltage is connected to terminal 10, a voltage drop occurs across resistor 8, which serves to suppress the switching dead time of transistor 4.

This voltage drop can also be created by connecting Zener diodes or other diodes in parallel. Zener diode 9 has a protection function.

It is clear that several modifications can be made to the embodiments described above. For example, the coil 3 can be connected to the line 1 instead of the line 20, and the switched terminal 10 can be connected to any power source that operates the transistor control electrode.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of a coil current supply circuit according to the present invention. First line...1 Second line...2 Coil...3 Power type Mo5pET transistor means...4 First resistance means...6 Second resistance means...8 Capacitor means ...7 Zener diode means...9 First terminal...11 Second terminal...12 Third terminal...10

Claims (1)

[Claims] ■. A coil DC U sinking the upper magnet with a coil connected to a DC power supply (in a feeding circuit, a first electrode is connected to a first terminal of the DC power supply by a first line); A second power type MOS F18' has transistor means, and a second voltage source is connected to a second voltage source of the DC power source by a second line.
one of the first or second lines is connected to the coil, a third electrode is connected to the third terminal by a control line, and the control line is a first resistor means, means for connecting the third terminal to a voltage source; and a capacitor means connected between the control line and the first line. Coil current supply circuit. 2. A coil current supply circuit according to claim 1, comprising: a second resistor connected in series to the capacitor means; 3!1\πr The coil current supply circuit according to claim 1, further comprising Zener tie-out means connected in parallel to the capacitor means. 4. Claim 2: The coil-1 current supply circuit according to claim 2, wherein the second resistance means has a value approximately ⅙ of that of the first resistance means. 5. Power type MOS J=” E T transistor means, first
A plug for supplying current to a coil comprising a case housing a resistor means, a capacitor means, and a line means for connecting the capacitor means.