JP3168619B2 - Rectifier with protection function - Google Patents

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 is designed to prevent an inductive lightning surge that enters from a power supply line (AC side) and a surge caused by opening and closing an inductive load that enters from a load side (DC side). The present invention relates to a rectifier with a protection function having a protection function.

[0002]

2. Description of the Related Art Conventionally, full-wave rectifier diode bridges widely used in electrical equipment are susceptible to abnormal voltages such as induced lightning surges and surges caused by switching of inductive loads. Therefore, some type of surge absorber is used. I have. FIG. 4 shows an example of an electric circuit diagram, wherein 1 is a full-wave rectifier diode bridge, 2 and 3 are surge absorbers, and these surge absorbers 2 and 3 usually have surge absorbers such as zinc oxide varistors. Absorbers are used.

[0003]

However, in the above-described conventional configuration, the surge absorber is used as a discrete component or a chip component as an external component on a printed circuit board or the like. In addition, there is a problem in use in terms of mounting space.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a small-sized rectifier having a protection function which is easily mounted.

[0005]

In order to achieve the above object, a rectifier having a protection function according to the present invention comprises an AC full-wave rectifier diode block having one side of an opposing surface of an angularly formed full-wave rectifier diode block.
A rectangular plate-shaped voltage-dependent non-linear resistance element or a dielectric having voltage-dependent non-linear resistance characteristics, having an input terminal and a DC output terminal on the other surface, and having end electrodes on both ends on opposite surfaces of the block; The elements are electrically and mechanically connected to the respective terminals by integrating each of the end face electrodes with each other, and the end face electrodes of these elements are connected to the outside and are connected to the DC output terminal side. Rise of the above elements
Voltage (varistor voltage) is connected to the AC input terminal side.
This is configured to be higher than that of the element to be manufactured .

In addition, a voltage-dependent nonlinear resistance element or
The width (depth) of a dielectric element having pressure-dependent nonlinear resistance characteristics
The height and width of the full-wave rectifier diode block
) And height are almost the same .

[0007]

According to this structure, a rectifier with a protection function provided with a surge absorber effective for an abnormal voltage on the AC input side and the DC output side can be obtained as a single component that is easy to install and connect. Miniaturization is also possible , and the rise of the element
Voltage (varistor voltage) is connected to DC output terminal side
To be higher than the one connected to the AC input terminal side
Can be more advantageous in terms of miniaturization.
You.

In addition, a voltage-dependent nonlinear resistance element or
The width (depth) of a dielectric element having pressure-dependent nonlinear resistance characteristics
The height and width of the full-wave rectifier diode block
Out) and height are almost the same.
Can be mounted as a single component on a printed circuit board, etc.
And connection can be made easier .

[0009]

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

FIG. 1 is a perspective view showing a rectifier having a protection function according to an embodiment of the present invention. Reference numeral 4 denotes a full-wave rectifier diode block formed in a square shape, and one end face thereof has an AC.
Input terminals 5 and 5a are provided, and DC output terminals 6 and 6a are provided on the other end faces facing each other. Reference numerals 7 and 8 denote voltage-dependent non-linear resistance elements formed of, for example, zinc oxide type voltage-dependent non-linear resistance elements, each formed in the shape of a square plate. It is set to the same or almost the same height as the height. At both ends of these elements 7 and 8, end face electrodes 9, 9a and 10, 10a are provided over all five surfaces, respectively, and these end face electrodes 9, 9a and 10,
The inner side of 10a is the AC input terminal 5,
The block 4 and the elements 7 and 8 are electrically and mechanically connected to 5a and 6 and 6a, respectively. Also, the end face electrodes 9, 9a and 1 of the elements 7, 8
Reference numerals 0 and 10a have other surfaces such as a bottom surface except an inner side surface used as connection terminals with the outside such as a wiring portion on a printed board (not shown).

FIG. 2 shows an electrical equivalent circuit of the rectifier with a protection function configured as described above. An 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. If 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 supply side as shown in FIG. The element 8 operates as a surge absorber with respect to an abnormal voltage such as a surge due to opening and closing of a reactive 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 changed by connecting the element 8 connected to the DC output terminals 6 and 6a of the diode block 4 to the AC input terminals 5 and 5a. 1 is higher than the element 7 connected to the device, and the appearance is not different from that of FIG.

FIG. 3 shows an example of the path of the induced lightning that has entered from the AC power source side. The paths A and B and the three paths composed of the paths A and B are determined by the rising voltage (varistor voltage) characteristics of the elements 7 and 8. Although there are three possible ways (three cases in the case of reverse polarity as well), at this time, since the rising voltage of the element 8 is higher than the rising voltage of the element 7 as described above, the path becomes only A, Therefore, since the element 8 only has to deal with the surge on the load side, an effect that the size can be reduced as compared with the element 7 can be obtained.

In the above embodiment, the case where a voltage-dependent nonlinear resistance element is used has been described. However, the present invention may use a dielectric element having a voltage-dependent nonlinear resistance instead. Of course.

[0015]

As described above, the present invention is formed in a square shape.
A on one of the opposing surfaces of the full-wave rectifier diode block
Provide a C input terminal and a DC output terminal on the other surface.
Square plate with end face electrodes at both ends on opposing faces of block
Voltage-dependent nonlinear resistance element or voltage-dependent nonlinear
A dielectric element having a resistance characteristic is connected to each of the end face electrodes.
It is electrically and mechanically connected to each of the above terminals and integrated,
In addition, the above-mentioned end face electrodes of these elements are connected to external connection terminals.
And the rise of the element connected to the DC output terminal side
Voltage (varistor voltage) is connected to the AC input terminal side.
It is is obtained by higher structure than that of the element, with a protective function with rectifier having an AC input and DC output side effective surge absorber against abnormal voltage, a strong rectifying device surge, installation and connection obtained as a simple single piece of state, and are not able to compact without taking space, is connected to the rising voltage of the device (varistor voltage), whichever is connected to the DC output terminal side to the AC input terminal be higher than those that
Thus , the element on the DC output side only has to deal with the surge on the load side, which is advantageous for further miniaturization. Also, a voltage-dependent nonlinear resistance element
Or of a dielectric element having a voltage-dependent nonlinear resistance characteristic
Width (depth) and height are full-wave rectifier diode blocks
The width (depth) and height of the
This makes it a single component on a printed circuit board, etc.
The attachment and connection are made easier.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a rectifier with a protection 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M ^7/ 00-7/40 H02H 9/04

Claims (2)

(57) [Claims] An AC input terminal is provided on one of the opposing surfaces of a rectangular full-wave rectifier diode block and a DC output terminal is provided on the other surface, and end electrodes are provided on both ends of the opposing surface of the block. A rectangular plate-shaped voltage-dependent non-linear resistance element or a dielectric element having a voltage-dependent non-linear resistance characteristic, wherein each of the end face electrodes is electrically and mechanically connected to each of the terminals to be integrated, And the above-mentioned end face electrodes of these elements are used as connection terminals with the outside, and the above-mentioned DC output terminal
Voltage-dependent nonlinear resistance element connected to
Rise of dielectric element with voltage-dependent nonlinear resistance characteristics
To the element connected to the AC input terminal.
A rectifier with a protection function that is higher than that . 2. A voltage-dependent nonlinear resistance element or a voltage-dependent element.
(Depth) and width of a dielectric element having a non-linear resistance characteristic
And height are width (depth) of full-wave rectifier diode block
And the height is almost the same.
The rectifier with a protection function according to claim 1.