JPS6310882B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a resistor element for a voltage divider.
The purpose is to provide a resistive element for a voltage divider having a large series capacitance, for example, to improve the high frequency characteristics of a high voltage resistive voltage divider or to improve the voltage sharing characteristics at high frequencies.

FIG. 1 shows a conventional device of this type, which is used, for example, in high voltage resistive voltage dividers. In the figure, 101 is a heat-resistant insulating substrate such as alumina porcelain, and 102 is a linear resistor formed on this substrate 101 by firing, for example, a ruthenium oxide resistance paste. 103 and 10
Reference numeral 4 denotes an electrode provided for connecting the ends of the resistor, which is also formed on the substrate 101 by a metal vapor deposition method or the like. The linear resistor 102 is formed in a zigzag pattern in order to increase the resistance value and therefore the length, and constitutes the voltage divider resistor element 100 as a whole.

Ruthenium oxide resistance paste can be said to be a particularly suitable material for the resistance element of a high-voltage resistive voltage divider because its firing treatment conditions are simple, its high voltage withstand capability is high, and a high resistance value can be obtained relatively easily.

As the voltage rating increases, simply installing the resistor element 100 shown in FIG. , often housed in a grounded container filled with an insulating medium.

When built into a grounded container, the stray capacitance to the ground of each part of the resistor becomes large, and as a result, as is well known,
When a high frequency voltage is applied, uneven distribution of voltage among various parts of the resistor is promoted. This is not preferable as a resistive voltage divider because it causes local burnout of the resistor, destabilization of the resistance, and deterioration of the frequency characteristics of the voltage division ratio due to the application of the impulse voltage.

This invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and in order to improve the above-mentioned characteristics, it provides a resistor element for a voltage divider configured to increase the series capacitance of the resistor itself. It is.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
This will be explained based on the diagram.

FIG. 2 shows only the pattern of the linear resistor, and other components are omitted from illustration. In FIG. 2, a solid line indicates a pattern of a first resistor arranged on the front side of the substrate, and a dotted line indicates a pattern of a second resistor arranged on the back side of the substrate.
In FIG. 2, the dotted line is slightly shifted to the lower left from the solid line so that both patterns are easy to see, but in reality they are arranged so that they match. Furthermore, for convenience of explanation, the numbers indicating the positions of each resistor are 0, 1, 2, ..., 20 for the first resistor, and 0, 1, 2, ..., 20 for the second resistor.
It is shown as 0′, 1′, 2′..., 20′. Both resistors are connected in parallel at their starting points 0, 0' and their ending points 20, 20'.

FIG. 3 shows the correlation between the lengths of both resistors from the starting point 0, 0' shown in FIG. 2 to the same point on the front and back sides of the substrate. That is, the horizontal axis is the position number of the first resistor, and the vertical axis is the position number of the second resistor. If we consider the first resistor as a reference, for example, points 3 and 5' are on the board. Since both sides are at the same point, the second resistor has a longer length from its starting point at this point. This is shown in FIG. 3 by an upward arrow. Next, at points 5 and 3', the length of the first resistor from its starting point is conversely greater, and this is indicated by a downward arrow. 4 and 4', the lengths are equal and are indicated by dots in FIG. Similarly, it can be seen that these positional relationships change periodically towards the end points 20, 20'.

When a high frequency voltage is applied across the resistor element having the resistor pattern described above, points 3 and 5',
At points 5 and 3', which have different lengths from the starting point, a potential difference occurs between the front and back sides of the substrate, and a current of charge flows corresponding to the capacitance at that point. This is indicative of the voltage sharing equalization effect of the resistance element itself, and at the same time has the effect of reducing the specific gravity of the voltage sharing imbalance effect due to stray capacitance between the resistance element and the grounded container.

The voltage sharing equalization effect described above is caused by the capacitance between the front and back surfaces of the substrate (this is affected by the dielectric constant and thickness of the substrate) and the applied voltage difference (this is affected by the width of the pattern in Figure 2, for example, the point From this point of view, the above-mentioned alumina porcelain has a relative permittivity of about 9, which is 100KV/
It has a dielectric strength of about mm, so the thickness is about 1.0 mm.
Therefore, it is suitable as a material for a substrate to which the present invention is applied.

FIG. 4 shows another embodiment of the resistor pattern according to the present invention, which has the same effect as FIG. 2.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a conventional resistance element for a voltage divider, FIG. 2 is a diagram showing a pattern of a resistor according to an embodiment of the present invention, and FIG. 3 is for explaining the operation of FIG. 2. FIG. 4 is a pattern diagram showing another embodiment of the present invention. In the figure, 100 is a voltage divider resistor element, 10
1 is a substrate, 102 is a linear resistor, 103 and 1
04 is an electrode, 0 and 0' are starting points, and 20 and 20' are ending points.

Claims (1)

[Scope of Claims] 1. In a voltage divider resistance element formed by forming a linear resistor between two electrodes on an insulating substrate, the same starting point on the front and back sides of one of the electrodes and the other of the electrodes are provided. forming resistors on both the front and back surfaces of the substrate so that they are connected in parallel between the same termination points on the front and back sides of the substrate;
The arrangement pattern of the resistors is arranged so that the difference in the length of the resistors from the starting point to a predetermined same point on the front and back of the substrate changes periodically as it approaches the terminal point of the resistors. A resistive element for a voltage divider, characterized in that: 2. The resistor element for a voltage divider according to claim 1, wherein the resistor is formed by firing a ruthenium oxide resistor paste. 3. A resistive element for a voltage divider according to claim 1 or 2, wherein the substrate is made of alumina porcelain.