JPS5957510A - Electric circuit possible for adjustment of circuit constant - Google Patents

Abstract

PURPOSE:To change the value of a constant over a wide range with a few elements, by combining elements in which the ratio of the constant of an individual element is the power of 2 and electric switching means having the same number of elements. CONSTITUTION:Elements having respectively constants a, 2a, 2<2>a-2<log2(>N<-1)>a are connected in series in the case of resistive or inductive elements (in parallel in case of the capacitive elements). Further, the electric switching means is connected in parallel with each element (in series in case of the capacitive elements). Then, the elements connected in parallel (in series in case of the capacitive elements) are operative by opening (closing in case of the capacitive elements) the electric switching means, and the elements are short-circuited (opened for the capacitive elements) and inoperative, by closing (opening for the capacitive elements) the switching means. The combination of the opening/closing of the switching means in this way allows the constants to be changed over a wide range with a few elements.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric circuit that can adjust a circuit constant stepwise and at equal intervals, which is formed by combining several electric elements whose constants vary and electrical switching means.

Conventionally, as a method of changing the circuit constants of an electric circuit, a method of mechanically changing the shape, size, position, etc. of an effectively used portion of an element is usually used.

For example, in a variable resistor, the effective resistance length is changed and the resistance value is adjusted by changing the position of the contact in contact with the resistor. By changing the C plane, the capacitance can be changed. In the inductance, a method is used in which the inductance is changed by moving the fur of the 2[fE body in and out of the coil. The method of mechanically moving the members constituting these elements has a relatively simple structure and has the advantage of being able to continuously change the constant value (7), but has disadvantages such as poor durability and stability. Adjustment requires mechanical means such as turning a knob, and automation requires a complicated servo machine. Under specific usage conditions, there is also a method of changing circuit constants using active elements such as reactance tubes and varactors, but the range in which the constants can be changed is small and it can only be used for specific circuits. The power that can be applied is also very small. Further, even though the voltage can be varied, there is no method to calculate the resistance value Ra1n as a time constant, and for other reasons, the range of use of the above method is limited.

The simplest and most reliable method is to change the constant (for example, as shown in Figure 1, a large number of elements with different constants are connected through electrical switching means, and the switching means is changed as required). A method for making an element operate with a T6 constant, and a further development of this method is as shown in Fig. 2.
It is easy to think of a way to connect them in base order and obtain the necessary constants by combining them.

However, (-) the circuit Lt using this method requires an extremely large number of elements and a corresponding number of electrical switches,
Practical” - unfavorable.

A circuit that can accurately and easily set various electrical constants 7 as needed is extremely useful in the construction of various measuring instruments.

It is also useful as a test device when determining the optimal value of the electrical constants of a circuit using methods such as ``trial and error'', such as when setting resistance values to adjust the flight rate of ink for each printing node in an inkjet printer. is large.

An object of the present invention is to provide an electric circuit system that is durable, highly reliable, can be automatically controlled, and is composed of a small number of elements whose constant values can be varied over a wide range. The above purpose is to connect a series of stagnant elements in series or parallel so that the ratio of the constants of the individual elements is a power of 2, and to fabricate t elements. ! Also, by combining the above-mentioned elements that make 6J inoperable and the same number of electrical switching means.

In the case of a circuit that can change in number in N stages (N is a number that is a positive integer power of 2), a + 2a + 22a・23
a・°.

2(1g2N-1)a, a constant (a is any positive real number)
I7) The elements are connected in series (in the case of an inductive element (in parallel) in the case of a capacitive element), and electrically connected in parallel to each element (1α series in the case of a capacitive element). ＼To connect ＼Thus E j Second, - [- electrical switching means> By opening (self-closing in the case of a capacitive element), it is connected in parallel (in series in the case of a capacitive element) with this. The element is in an operating state, and by closing the opening/closing means (open in the case of a capacitive element), the element is burnt (opened in the case of a capacitive element) and becomes inactive.

FIG. 3 is a general diagram of a circuit according to the present invention in which the resistance, the inductance, and the capacitance can be varied, respectively.

- According to the present invention, the number of elements and electrical switching means required to perform two constant changes in N stages is log2N.

If the electrical switching means connected in parallel to the element having the value of the constant a r 2a + 22a + 23a peels SW, , SSW, , SWB, S; W4, for example, the value 2a is obtained. If you want to obtain the value S5a, open SW2, close the other SWs, and close the pond SW. If all SWs are closed, the value will be O, and if all SWs are open, the value will be (N-1)a. By opening and closing each SW appropriately as described above, O to (
In the range of N-1)a, N stages of circuit constants can be obtained with an interval a.

This will be explained below using an example.

Figure 6 shows a circuit in which the resistance can be changed in 32 steps, each with resistances of 100Ω, 200Ω, 400Ω, 800Ω,
The circuit of the present invention connects one resistor element having a resistance value ff of 1600 Ω and five switches (SW+ - "SWi). By opening and closing each switch as shown in the table below, terminal A is , B resistance value yo to 3100
It can be freely set within the range of Ω'-100Ω.

〔table〕

In the table, 0 indicates the switch is closed and l indicates the switch is open.

Although the variable inductance circuit and the variable capacitance circuit have been omitted in the above description, their implementation, advantages, etc. are the same as those for the variable resistance circuit.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a system in which multiple elements are switched individually; Figure 2 is a circuit diagram in which elements are connected and switched in a decimal system; Figure 3 is a resistance constant adjustment circuit according to the present invention; Figure 4 is an inductance according to the present invention. Constant adjustment circuit, Fig. 5 Capacitance constant adjustment circuit according to the present invention, Fig. 6 Resistance constant adjustment circuit Example Representative Yoshimi Kuwahara (α) (shi) (C)

Claims (1)

[Claims] (1) Consisting of a plurality of electrical elements connected in series or parallel and the same number of electrical switching means as the elements for individually activating or inactivating the elements, the elements have a ratio of constants of the individual elements. An electrical circuit with an adjustable circuit multiplier, characterized in that it has a constant that is a power of two.