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Relay switching circuit

A technology for switching circuits and relays, which is applied to relays, circuits, electrical components, etc., and can solve problems such as the fragile ability to withstand lightning strikes

Active Publication Date: 2015-09-30
AMBIT MICROSYSTEMS (SHANGHAI) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When designing product circuits, the ability to withstand lightning strikes must be considered to prevent product damage when the PSTN network is struck by lightning. However, in today's product circuits, only one relay is usually used to form a relay switching circuit, making the relay switching circuit a product circuit. Parts that are relatively vulnerable to lightning strikes

Method used

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Examples

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Embodiment Construction

[0065] figure 1 It is an application environment and block diagram of an embodiment of the relay switching circuit 11 of the present invention. Such as figure 1 As shown, in this embodiment, when the user makes a phone call, the device will use the following circuit and network for signal transmission, and the circuit and network usually include the integrated access device 1 , PSTN network 2 and telephone 3 . The integrated access device 1 includes a relay switching circuit 11, a FXS (Foreign Exchange Station, external exchange station) interface 12, an FXO (Foreign Exchange Office, external exchange office) interface 13, a network interface 14, a front-end circuit 15, a controller 16, and an FXS Circuit 17, FXO circuit 18, wherein the relay switching circuit 11 is used to switch the call line and improve the lightning resistance capability of the integrated access device 1, the FXS interface 12 is used to connect the telephone set 3, and the FXO interface 13 and the network...

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PUM

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Abstract

A relay switching circuit includes a first relay, a second relay, a first control circuit and a second control circuit. The first relay is connected to an FXS interface and an FXS circuit and is used for controlling the connection of the FXS interface and the FXS circuit. The second relay is connected with the first relay and the FXO interface and is used for controlling the connection of the first relay and the FXO interface. The first control circuit is connected with a controller and is sued for controlling the switching on or off of the first relay. The second control circuit is connected with the controller and is used for controlling the switching on or off of the second relay. If a PSTN network is struck by lightning, the relay switching circuit can resist surge voltage of high magnitude, so that the lightning resistance is enhanced greatly.

Description

technical field [0001] The invention relates to an electronic circuit, in particular to a relay switching circuit. Background technique [0002] VoIP (Voice over Internet Protocol, Voice over Internet Protocol) is a telephone mode in which telephone calls are made through Internet protocols. At present, a single relay is usually used as a switching circuit in the product circuit applying VoIP. When the product is working normally, the relay will switch to the FXS (Foreign Exchange Station, external exchange station) communication circuit, and the user can dial VoIP or PSTN (Public Switched Telephone Network, public switched telephone network) telephone; when the product is powered off, the relay will switch to the PSTN network, and users can only make PSTN calls. When designing product circuits, the ability to withstand lightning strikes must be considered to prevent product damage when the PSTN network is struck by lightning. However, in today's product circuits, only one ...

Claims

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Application Information

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IPC IPC(8): H01H47/00
Inventor 黄志成
Owner AMBIT MICROSYSTEMS (SHANGHAI) LTD
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