JPH0538146A - Rectifier with protective function - Google Patents

Abstract

PURPOSE:To obtain such a rectifier provided with protective function commonly used for electric equipments, that it is strong against abnormal voltage such as induction lightning surge, etc., entering from AC and DC sides, it is easy to mount and that it is compact. CONSTITUTION:AC input terminals 5, 5a and DC output terminals 6, 6a are provided to opposite faces of a full-wave rectification diode block 4 formed in a square shape, and square plate-like voltage dependent non-linear resistance elements 7 and 8 having face electrodes 9, 9a and 10, 10a on both ends are integrated into a unit by connecting the face electrodes 9, 9a and 10, 10a to terminals 5, 5a and 6, 6a on the opposite faces of the block 4. The element 7 against abnormal voltage from AC power supply side and the element 8 against abnormal voltage from load side function as surge absorbers, and a rectifier with protective function can be miniaturized and easily mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is widely used in electric equipment, and against an inductive lightning surge entering from a power supply line (AC side) and a surge caused by switching an inductive load entering from a load side (DC side). The present invention relates to a rectifying device with a protective function having a protective function.

[0002]

2. Description of the Related Art Conventionally, full-wave rectifier diode bridges widely used in electrical equipment are vulnerable to abnormal voltage such as inductive lightning surge or surge due to opening / closing of inductive load. Therefore, some surge absorber is used. There is. An example of the electric circuit diagram is shown in FIG. 4, 1 is a full-wave rectifier diode bridge, 2 and 3 are surge absorbers, and the surge absorbers 2 and 3 are usually surges such as zinc oxide varistors. An absorber is used.

[0003]

However, in the above-mentioned conventional configuration, the surge absorber is used as a discrete component or a chip component, connected and used as an external component on a printed circuit board, etc. Also, there was a problem in use in terms of mounting space.

An object of the present invention is to solve the above-mentioned problems of the conventional example, and to provide a small-sized and easy-to-install rectifying device with a protective function.

[0005]

In order to achieve this object, a rectifying device with a protective function according to the present invention has an AC on one of opposite surfaces of a square-shaped full-wave rectifying diode block.
A rectangular plate-shaped voltage-dependent non-linear resistance element or a dielectric having voltage-dependent non-linear resistance characteristics, which has an input terminal and a DC output terminal on the other surface, and has end face electrodes at both ends on opposite surfaces of the block. The elements are integrated by electrically and mechanically connecting the respective end face electrodes to the respective terminals, and the end face electrodes of these elements are used as connection terminals to the outside.

Further, the rising voltage (varistor voltage) of the element connected to the DC output terminal side is higher than that of the element connected to the AC input terminal side.

[0007]

According to this structure, the rectifier with protection function, which has the surge absorber effective against the abnormal voltage on the AC input side and the DC output side, can be obtained as a single component which can be easily attached and connected. It can also be miniaturized.

Further, the rising voltage of the element (varistor voltage)
Is made higher than that connected to the DC output terminal side than that connected to the AC input terminal side, which can be more advantageous in terms of downsizing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a rectifying device with a protection function according to an embodiment of the present invention. Reference numeral 4 is a square full-wave rectifying diode block, one end surface of which is AC.
Input terminals 5 and 5a are provided, and DC output terminals 6 and 6a are provided on the other opposing end surface. Reference numerals 7 and 8 are voltage-dependent non-linear resistance elements made of, for example, zinc oxide type voltage-dependent non-linear resistance elements, each formed in a rectangular plate shape, and the width (depth) and height thereof are the same as those of the block 4 described above. The size is set to be almost the same as the height. At both ends of these elements 7 and 8, end face electrodes 9, 9a and 10, 10a covering all five faces are provided, and these end face electrodes 9, 9a and 10,
The inner side surface of 10a is the AC input terminal 5 of the block 4.
Electrically and mechanically connected to 5a and 6a, respectively, and the block 4 and the elements 7 and 8 are integrated. Further, the end face electrodes 9, 9a and 1 of the elements 7, 8 are
0 and 10a are used as connecting terminals to the outside such as a wiring portion on a printed circuit board (not shown) on the other surface such as the bottom surface portion except the inner side surface portion.

The electrical equivalent circuit of the rectifying device with a protective function constructed as described above is as shown in FIG. 2, in which the AC input line is connected to the end face electrodes 9 and 9a of the element 7, and the end face of the element 8 is connected. When a DC load is connected to the electrodes 10 and 10a, the element 7 operates as a surge absorber against an abnormal voltage such as an induced lightning surge from the AC power source side as shown in FIG. The element 8 operates as a surge absorber against an abnormal voltage such as a surge due to the opening and closing of the sexual load.

Next, another embodiment will be described. The difference from the above embodiment is that the rising voltage (varistor voltage) of the elements 7 and 8 is connected to the DC output terminals 6 and 6a of the diode block 4 and the element 8 is connected to the AC input terminals 5 and 5a. It is higher than the element 7 connected to, and the external configuration is the same as in FIG.

FIG. 3 shows an example of the path of the induced lightning that has entered from the AC power source side. Depending on the rising voltage (varistor voltage) characteristics of the elements 7 and 8, the paths A and B and the combined path 3 are Although there are three possible ways (the same applies to the case of the opposite polarity, there are three ways), but at this time, by setting the rising voltage of the element 8 higher than the rising voltage of the element 7, the path is only A, Therefore, since the element 8 only needs to be subjected to the surge on the load side, it is possible to obtain an effect that it can be made smaller than the element 7.

In the above embodiment, the case of using the voltage-dependent non-linear resistance element has been described, but the present invention may use a dielectric element having the voltage-dependent non-linear resistance instead. Of course.

[0015]

The present invention is constructed as described above, and the surge absorber effective against abnormal voltage is
A rectifier with protection function provided on the input side and DC output side, a rectifier resistant to surge can be obtained as a single component that is easy to install and connect, and can be downsized without taking up space. Further, when the rising voltage (varistor voltage) of the element is set higher on the side connected to the DC output terminal side than on the side connected to the AC input terminal side, the element on the DC output side only receives the surge on the load side. Since it can be targeted, it is advantageous for further miniaturization.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a rectifying device with a protective function according to the present invention.

FIG. 2 is an electrical equivalent circuit diagram of the rectifier.

FIG. 3 is a circuit diagram for explaining the operation of the rectifier.

FIG. 4 is a circuit diagram showing a conventional rectifier.

[Explanation of symbols]

4 Full wave rectifier diode block 5,5a AC input terminal 6,6a DC output terminal 7,8 Voltage-dependent non-linear resistance element 9,9a, 10,10a End face electrode

Claims (2)

[Claims] 1. A square-shaped full-wave rectifier diode block is provided with an AC input terminal on one of opposite faces and a DC output terminal on the other face, and end face electrodes are provided at both ends of the opposite faces of the block. A rectangular plate-shaped voltage-dependent nonlinear resistance element or a dielectric element having voltage-dependent nonlinear resistance characteristics, each of the end face electrodes is electrically and mechanically connected to each of the terminals to be integrated, A rectifying device with a protective function, in which the end electrodes of these elements are used as connection terminals to the outside. 2. A rising voltage (varistor voltage) of a voltage-dependent nonlinear resistance element or a dielectric element having voltage-dependent nonlinear resistance characteristics connected to a DC output terminal side is connected to an AC input terminal side. The rectifying device with a protective function according to claim 1, wherein the rectifying device has a height higher than that of the element.