JPH0529103U - Socket type surge absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a socket type surge absorber that can effectively protect an electronic circuit from a surge without disposing the surge absorption circuit on the circuit board of the electronic device. [Composition] A case 8 having a hollow inside, and a first power supply terminal 14 and a second power supply terminal 16 protruding from the case 8 are provided.
The electronic device 70 includes a main body 4 stored therein, a recess 24 for inserting a power outlet, and a first power plug 28 and a second power plug 30 protruding from a bottom surface 26 of the recess 24. The socket portion 6 in which the recess 24 is exposed to the outside of the electronic device 70
Having a first power plug 28 and a first power terminal
Power supply line a for connecting with 14, the second power supply plug 30 and the second
The surge absorbing circuit 40 in which the composite type surge absorbing elements 42, 42 and the varistor 46 are connected between the power absorbing terminal 40 and the power source line b is connected to the inside of the main body 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surge absorber, and more particularly to a socket type surge absorber in which a surge absorbing circuit is housed inside a main body integrally formed with a power socket equipped in electronic equipment and the like.

[0002]

[Prior Art]

 In order to protect the electronic circuit from surges and noises that enter the electronic equipment via the power supply line, it is common to interpose a surge absorbing circuit and a noise filter circuit in the preceding stage of the electronic circuit. That is, a surge absorption circuit equipped with a surge absorption element such as a varistor or gas arrester absorbs a high-voltage surge, and a noise filter circuit equipped with a capacitor and a coil attenuates low-voltage and high-frequency noise. Therefore, some attempt to protect electronic circuits from a wide range of surges and noise.

[0003]

[Problems to be solved by the device]

 Conventionally, the above surge absorption circuit and noise filter circuit were mounted on the circuit board of electronic equipment, but as the electronic equipment becomes smaller, it is necessary to place the surge absorption circuit in addition to the noise filter circuit. It has become difficult to secure this space on the circuit board. In addition, assembling a surge absorption circuit on the circuit board of an electronic device requires complicated work and leads to an increase in cost.Therefore, many electronic devices have no surge protection measures, and such electronic devices are always There is a risk of circuit damage due to surge intrusion.

The present invention is intended to solve the above-mentioned problems of the prior art, and an object of the present invention is to arrange a surge circuit for an electronic circuit without disposing a surge absorption circuit on a circuit board of an electronic device. The aim is to realize a socket-type surge absorber that can be effectively protected from

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a socket type surge absorber according to the present invention comprises a case having a hollow interior, a first power supply terminal and a second power supply terminal projecting from the case, and is attached to A main body part to be stored inside the device, a concave part for inserting a power outlet, a first power plug and a second power plug projectingly provided on the bottom surface of the concave part, A first power supply line for connecting the first power supply plug and the first power supply terminal, the second power supply plug, and the second The surge absorbing circuit, in which a surge absorbing element is connected between the second power source line and the power source terminal, is housed inside the main body.

It is desirable that the case be a metal case. The surge absorbing element is a so-called composite type surge absorbing element in which a pair of electrodes are arranged opposite to each other across a voltage non-linear resistor with a discharge gap, and the electrodes are enclosed in an airtight container together with discharge gas. It is desirable to configure.

[0007]

[Action]

 Then, the voltage supplied from the power outlet plugged into the recess of the socket through the first power plug and the second power plug is absorbed by the surge absorbing element connected between the lines. After the overvoltage is absorbed, electric power is supplied to the electronic circuit in the electronic device through the first power supply terminal and the second power supply terminal.

As described above, since the surge absorbing circuit is housed inside the main body integrated with the power socket that is usually equipped in most electronic devices, it is possible to eliminate the surge absorbing circuit on the circuit board. , It is possible to interpose a surge absorption circuit in the front stage of the electronic circuit. Even with existing electronic equipment that does not have surge protection measures, the surge absorption circuit can be easily installed by replacing the power socket.

[0009]

【Example】

 The present invention will be described below based on the illustrated embodiments. As shown in FIGS. 1 to 3, the socket type surge absorber 2 according to the present embodiment is roughly divided into a body portion 4 and a socket portion 6. The main body portion 4 has a hollow metal case 8, an earth terminal 12 connected to the rear surface 10 of the case 8 at substantially the center thereof, and a projecting portion provided on the rear surface 10 so as to sandwich the earth terminal 12. It has a first power supply terminal 14 and a second power supply terminal 16. The base end portions (not shown) of the first power supply terminal 14 and the second power supply terminal 16 are respectively inserted into the inside of the case 8, and by the reinforcing members 18, 18 made of an insulating material such as synthetic resin, It is fixed so that it does not fall out of the case 8. The case 8 is formed with a first flange 20 for mounting.

The socket portion 6 is formed of an insulating material such as synthetic resin, and has a second flange 22 and a recess 24 for inserting an outlet, and the lower surface 26 of the recess 24 has a first electrical contact. A source plug 28, a second power plug 30, and a ground plug 32 are provided so as to project. The base ends (not shown) of the first power plug 28 and the second power plug 30 are inserted into the case 8 described above.

By inserting the base end portion (not shown) of the socket portion 6 into the case 8 through the front opening portion (not shown) of the case 8, the socket portion 6 is fitted to the main body portion 4, and the socket type surge absorber is absorbed. The vessel 2 is formed. Reference numeral 23 indicates a screwing hole that penetrates the first flange 20 and the second flange 22.

Inside the socket type surge absorber 2, a surge absorbing circuit 40 having a circuit configuration shown in FIG. 4 is formed. That is, the surge absorbing circuit 40 is provided between the power supply line a connecting the first power supply plug 28 and the first power supply terminal 14 and the ground wire e, and the second power supply plug 30 and the second power supply terminal. Composite surge absorbing elements 42 and 42 are connected between the power supply line b connecting the 16 and the earth line e, and a varistor 46, which is a voltage non-linear resistance element, is further connected to the earth line e.

As shown in FIG. 5, the composite type surge absorbing elements 42, 42 have a pair of electrodes 54, 54, from which lead wires 52, 52 are respectively drawn, at both ends of a voltage non-linear resistor 50 for discharging a gap. The L is opposed to each other and is enclosed together with the discharge gas 58 in an airtight container formed by the electrodes 54, 54 and the outer cylindrical body 56, and the response to the surge is excellent. At the same time, it has a feature that the current resistance is large. That is, when a surge of the rated voltage or more is applied between the lead wires 52 and 52, the so-called varistor operation of the voltage non-linear resistor 50 immediately starts surge absorption at a response speed of about ^10-9 seconds. Then, due to the voltage drop due to the product of the resistance value of the voltage non-linear resistor 50 and the surge current value, the limiting voltage appears across the voltage non-linear resistor 50. Next, as the amount of current increases, this limiting voltage also rises, and when this exceeds the discharge start voltage between the electrodes 54, 54, excited discharge occurs in the region near the voltage nonlinear resistor 50, and The discharge instantly transfers the discharge between the electrodes 54, 54 to generate a main discharge that passes a large current, and the surge is absorbed by such arrester operation.

On the other hand, in the varistor 46, which is a voltage non-linear resistance element, as shown in FIG. 6, electrodes 62, 62 are formed on the front surface and the back surface of the metal oxide 60, respectively. It has a structure in which 64, 64 are derived, and due to the voltage non-linear characteristic of the metal oxide 60, a current flows when the specified voltage is reached and surge absorption starts.

In the present embodiment, the varistor 46 is inserted in addition to the composite type surge absorbing elements 42, 42 for the following reason. When only the composite surge absorption elements 42, 42 are used, when surge voltage is applied to the power supply lines a, b in the common mode, discharge occurs due to the arrester operation of the composite surge absorption elements 42, 42, and the voltage Becomes the sustaining voltage and drops sharply below the peak value of the power supply voltage. As a result, the above surge is absorbed, but the voltage of the composite surge absorbing elements 42, 42 often remains at a low value even after this surge is absorbed. The discharge may be maintained and a so-called follow current may occur. The varistor 46 functions to prevent the occurrence of this follow-up current. That is, the voltage between the power supply lines a and b and the ground line e is set to the peak of the power supply voltage by the voltage shared by the varistor 46 connected in series to the composite type surge absorbing elements 42 and 42. Since it can be set to a value higher than the above value, the occurrence of the follow-up current is effectively prevented.

On the other hand, the surge voltage that has entered the power supply lines a and b in the normal mode is maintained by the composite surge absorption elements 42 and 42 connected in series between the power supply lines a and b. The voltage also doubles, and it becomes easy to set this value above the peak value of the power supply voltage, so that the occurrence of a follow current is effectively prevented as in the above case.

Specific operating voltages of the composite type surge absorbing elements 42, 42 and the varistor 46 are appropriately set according to the type of protected circuit, operating environment, and the like.

As shown in FIG. 7, the socket type surge absorber 2 stores the main body 4 inside the electronic device 70, and the first flange 20 and the second flange 22 are electrically connected to each other. The device 70 is attached to the rear panel 72 of the device 70 by screwing or the like. At this time, the recess 24 of the socket 6 is exposed to the outside of the electronic device 70.

The socket type surge absorber 2 is connected to a noise filter circuit 74 formed on the circuit board 72 of the electronic device 70. That is, the noise filter circuit 74 includes a first capacitor 76 connected between the power supply line a ′ and the power supply line b ′, a first coil 78 connected in series with the power supply lines a ′ and b ′, and It is composed of a second coil 80, a second capacitor 82 and a third capacitor 84 which are connected between the power source lines a ′ and b ′ and the ground line e ′. One end is connected to the first power supply terminal 14 of the socket type surge absorber 2, and one end of the power supply line b ′ is connected to the second power supply terminal 16. The other end of the power supply line a'and the other end of the power supply line b'are connected to a protected circuit (not shown) located in the next stage.

Power is supplied from the power source 92 to the socket type surge absorber 2 through the outlet 90 inserted in the recess 24 of the socket portion 6. The voltage is supplied to the power supply lines a ′ and b ′ through the first power supply terminal 14 and the second power supply terminal 16 after the high voltage surge is absorbed by the surge absorption circuit 40. The noise filter circuit 74 attenuates low-voltage noise. In this way, after removing the surge and noise, the voltage is supplied to the protected circuit.

As described above, since the surge absorbing circuit 40 is formed in the metal case 8, the composite type surge absorbing elements 42, 42 and the varistor 46 which compose the surge absorbing circuit 40 are destroyed. Even in such a case, it is possible to block adverse effects on the electronic device 70 and the like.

The surge absorbing circuit stored in the main body portion 4 of the socket type surge absorber 2 is not limited to the surge absorbing circuit 40 shown in FIG. 4, but is compatible with electronic equipment to be protected, etc. In consideration of the above, it is possible to use a circuit in which various surge absorbing elements are appropriately incorporated. Further, it is not necessarily required to be connected to the noise filter circuit in the next stage, and may be directly connected to the electronic circuit of the electronic device.

[0023]

[Effect of the device]

 In the socket type surge absorber according to the present invention, the main body storing the surge absorbing circuit is integrally formed with the power socket which is usually equipped in most electronic devices. Therefore, the surge absorbing circuit is provided on the circuit board of the electronic device. Need not be embedded. Therefore, there may be cases where it is not possible to secure sufficient space for a surge absorption circuit on the circuit board due to the downsizing of equipment, or when it is not possible to incorporate the surge absorption circuit on the circuit board in terms of manufacturing costs. Also, a surge absorbing circuit can be provided in the front stage of the electronic circuit, and the electronic circuit can be effectively protected from the surge transmitted through the power supply line. In addition, the surge absorption circuit can be easily attached to existing electronic equipment that does not have surge protection measures by replacing the power socket.

By forming the case with a metal case, safety is improved when a surge absorbing element or the like forming the surge absorbing circuit is broken.

By configuring the surge absorbing element by the composite type surge absorbing element, a surge absorbing circuit excellent in surge response and having a large current withstanding capability is realized inside the socket type surge absorbing element. be able to.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a front view of the above embodiment.

FIG. 3 is a top view of the above embodiment.

FIG. 4 is a circuit diagram according to the above embodiment.

FIG. 5 is a cross-sectional view showing a configuration of a composite type surge absorbing element.

FIG. 6 is a cross-sectional view showing the structure of a varistor.

FIG. 7 is an explanatory diagram showing a usage example of the above embodiment.

[Explanation of symbols]

 2 Socket type surge absorber 4 Body part 6 Socket part 8 Case 14 1st power supply terminal 16 2nd power supply terminal 24 Recessed portion 26 Bottom surface 28 1st power supply plug 30 2nd power supply plug 40 Surge absorption circuit 42 Combined type surge Absorption element 46 Varistor 70 Electronic equipment a Power line b Power line

Claims (3)

[Scope of utility model registration request] 1. A main body part having a hollow interior, a first power supply terminal and a second power supply terminal projecting from the case, the main body being housed inside a device to be mounted, and a power outlet socket. A recess for insertion, a first power plug and a second power plug protruding from the bottom of the recess, and a socket for exposing the recess to the outside of the device to be mounted. ,
Between a first power supply line connecting the first power supply plug and the first power supply terminal, and a second power supply line connecting the second power supply plug and the second power supply terminal. A socket type surge absorber characterized in that a surge absorbing circuit to which a surge absorbing element is connected is housed inside the main body. 2. The socket type surge absorber according to claim 1, wherein the case is formed of a metal case. 3. The surge absorbing element is constituted by a composite type surge absorbing element.
Alternatively, the socket type surge absorber described in 2.