JPS6038247Y2 - surge absorber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a surge absorber using a voltage nonlinear resistor.

Voltage nonlinear resistors are used in rectifiers, silicon-controlled rectifiers, and other electrical equipment using semiconductors as a countermeasure against switching surges of external voltage or inductive loads.

Especially when used to protect silicon controlled rectifiers (hereinafter abbreviated as SCR), if only a voltage non-linear resistor was used as the surge countermeasure mentioned above, this capacitance would be a sudden dv/dt countermeasure. Since it is too small for practical use, we also use a series body of a capacitor C and a fixed resistor R in parallel with a voltage non-linear resistor.
Generally, a method is adopted in which a voltage nonlinear resistor is used as a means to suppress large surge voltage.

Further, R in particular often has the function of simultaneously absorbing the energy of oscillatory overvoltage during SCR commutation, and in order to withstand this energy, it is necessary to use R with a large rated power.

R with a large rated power inevitably has a large shape, and also requires a large voltage non-linear resistor to suppress surge voltages that have a large amount of energy, and the overall proportion of protective components in terms of space is extremely large. The current situation is that it has become larger.

The purpose of the present invention is to form a voltage nonlinear resistor, a fixed resistor, and a dielectric into a flat plate shape so that they can be assembled as a single unit, thereby making the shape extremely small.

An embodiment of the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIG.

In Fig. 1, numeral 1 indicates a fixed resistor, which is a flat resistor with electrodes 1a and 1b at both ends as shown in Figs. 2 and 3.
In addition, protective insulating paints 1c and ld are provided to ensure weather resistance.

In addition, if necessary, paste solder l as shown in Figure 2.
e and If are provided.

The resistance value of the fixed resistor is determined by the distance between the electrodes (d in Figure 2), and the rated power is determined by the size of the flat plate (R in Figure 2).

2 in Fig. 1 is a dielectric material such as a ceramic capacitor, which has the same shape as shown in Figs. 2 and 3.
1 in the figure is a dielectric.

The required capacitance and withstand voltage are determined by d and R.

Fixed resistor 1 and dielectric 2 are connected in series via terminal plate 3bw3c and heat sink 4a.

5a. Reference numerals 5b, 5c, and 5d are voltage nonlinear resistors having the same structure as shown in FIGS. 2 and 3, and 1 is a voltage nonlinear resistor.

The varistor voltage is determined by d, and the rated power (or surge withstand capacity or energy withstand capacity) is determined by R.

In FIG. 1, 5a and 5b and 5C and 5d are respectively terminal boards 3ft 3gt 3jt;l, heat sink 4b,
4c are connected in series, 5a, 5b and 5C
95d are connected in parallel.

That is, some of them are connected to the outside via external connection metal plates 6a, 6b, 6c, and 6d (which also serve as heat sinks).

6a and 6b and 6C and 6d are connected by metal rods 7at7b, and each serves as an external connection terminal of this assembly.

8a and 8b are insulating circular rods that assemble and tighten these parts, and the insulating plates 9a and 9b and the mounting bracket I are attached from both sides.
At the same time, the heat sink 4 is tightened through Da and 10b.
a, 4b, 4c metal plate 6at 6bt 6c.

To prevent positional deviation from occurring in 6d, make a circular hole in 8
It passes through a and 8b.

The equivalent circuit of the assembly shown in FIG. 1 is shown in FIG.

As described above, according to the present invention, the voltage nonlinear resistor, the dielectric material, and the fixed resistor are each shaped like a flat plate and are stacked to form a single unit, so that the surge absorber can be made extremely compact.

[Brief explanation of the drawing]

Fig. 1 is a side view of a surge absorber according to an embodiment of the present invention, Figs. 2 and 3 are cross-sectional side views of parts used in the surge absorber of Fig. 1, and Fig. 4 is a side view of the surge absorber of the same embodiment. It is a circuit diagram. 1...Fixed resistor, 2...Dielectric, 3
a~31...Terminal board, 5a~5d...
Voltage nonlinear resistor, 6a to 6d...metal plate, ?
a, 7b... Metal rod.

Claims (1)

[Scope of utility model registration request] The voltage non-linear resistor/dielectric and the fixed resistor are each shaped like a flat plate, the above three are stacked with electrode plates interposed between them, and insulating plates are placed at both ends of the stack, and this pair of insulating plates is A surge absorber configured such that the dielectric body and the fixed resistor are connected in series and connected in parallel to the voltage non-linear resistor, which are tightened together with bolts.