TWI567922B - Surge protection device - Google Patents

Description

Surge protection device

The present invention relates to a surge protection device, and more particularly to a surge protection device that couples a protection element through a discharge tip.

Integrated circuits are often added to the design of the protection device to suppress the impact caused by the instantaneous change of the electrical signal, such as: surge lightning or electrostatic discharge (ESD). Destructive glitch signal. Generally, the existing protection device provides a protection component between the integrated circuit and the signal injection point, and guides the spur signal to the ground through the protection component. However, existing protection devices often fail to direct the spur signal to the ground in time, thereby causing the integrated circuit to be damaged by the spur signal before the protection device is activated. Therefore, how to improve the reaction speed of the protection device has become a major issue in the design of the protection device.

The present invention provides a surge protection device that uses a discharge tip of a conductive wire to couple a protection element to thereby increase the reaction speed of the surge protection device.

The surge protection device of the present invention comprises an input and output point, a conductive line and a protection element. The conductive wire has a first connection end, a second connection end and a discharge tip, and the first connection end is coupled to the input and output points. The protection element is coupled between the discharge tip and the ground. When the spur signal appears at the input and output points, the surge protection device guides the spur signal to the ground through the conductive line and the protection component to protect the integrated circuit coupled to the second connection end.

In an embodiment of the invention, the protection element is a transient voltage suppression element. In addition, the first end of the transient voltage suppression component is directly coupled to the discharge tip, and the second end of the transient voltage suppression component is coupled to the ground.

In an embodiment of the invention, the surge protection device further includes an inductor and a capacitor. The first end of the inductor is coupled to the second connection end, and the second end of the inductor is coupled to the integrated circuit. The first end of the capacitor is coupled to the first end of the inductor, and the second end of the capacitor is coupled to the ground.

Based on the above, the present invention provides a discharge tip on a conductive line and a protective tip through a discharge tip of the conductive line. Thereby, the reaction speed of the surge protection device can be effectively improved, thereby improving the protection capability of the surge protection device.

The above described features and advantages of the invention will be apparent from the following description.

1 is a schematic diagram of a surge protection device in accordance with an embodiment of the present invention. As shown in FIG. 1, the surge protection device 10 includes an input/output point 110, a conductive line 120, and a protection element 130. The conductive line 120 has a first connection end 121, a second connection end 122 and a discharge tip 123. The first connection end 121 of the conductive line 120 is coupled to the input and output point 110. The second connection end 122 of the conductive line 120 is adapted to be coupled to an integrated circuit 20 . The protection component 130 is coupled between the discharge tip 123 and the ground GND. Further, the shape of the conductive line 120 may be, for example, a V shape.

The surge protection device 10 can be used to protect the integrated circuit 20 in an electronic device (not shown) to avoid damage to the integrated circuit 20 caused by a surge signal caused by a surge or electrostatic event. Specifically, the input/output point 110 of the surge protection device 10 corresponds to the injection point of the surge signal. For example, in application, the input and output point 110 of the surge protection device 10 can be, for example, an input/output interface coupled to the electronic device, and the input/output interface can be, for example, a connector, a button, a switch, a slot, Various types of input and output interfaces, such as the headphone jack, the microphone's sound hole, and so on.

Furthermore, the input/output interface of the electronic device has a channel or a gap connected to the outside of the electronic device, so that the electrostatic pulse can be injected into the electronic device through the input/output interface, thereby causing a surge on the input/output point 110 of the surge protection device 10. Signal. In addition, non-ideal effects caused by electronic components or parasitic components in the electronic device may also cause the voltage level of the input/output point 110 to suddenly rise, thereby causing a sudden rise in the input and output point 110 of the surge protection device 10. Wave signal.

For the spur signal appearing at the input and output point 110, the surge protection device 10 can guide the spur signal to the ground GND through the conductive line 120 and the protection component 130 to prevent the spur signal from flowing into the integrated circuit 20, thereby achieving The purpose of protecting the integrated circuit 20 is as follows. It is noted that the conductive line 120 includes a bend to form the discharge tip 123. In addition, when the surge signal flows through the discharge tip 123, a tip effect will occur, that is, a large amount of charge will collect at the discharge tip 123 of the conductive line 120. Thereby, the protection element 130 can quickly conduct a large amount of electric charge in response to the discharge tip 123, so that the reaction speed of the surge protection device 10 can be effectively increased. In other words, the surge protection device 10 can quickly turn on the protection element 130 through the tip effect induced by the discharge tip 123, and can guide the spur signal from the conductive line 120 to the ground GND through the protection element 130, thereby avoiding product accumulation. The body circuit 20 is damaged by the glitch signal.

In an embodiment, the protection component 130 can be, for example, a transient-voltage-suppression (TVS) component D1, and the TVS component D1 is adjacent to and coupled to the discharge tip 123. For example, the first end of the TVS element D1 is directly coupled to the discharge tip 123, and the second end of the TVS element D1 is coupled to the ground GND. Thereby, the TVS element D1 will be quickly turned on in response to the tip effect formed by the glitch signal flowing through the discharge tip 123. In this way, the surge protection device 10 can immediately guide the spur signal to the ground GND through the protection component 130, thereby effectively protecting the integrated circuit 20.

Further, the surge protection device 10 further includes a substrate 101, an inductor L1, and a capacitor C1. The input/output point 110, the conductive line 120, the protection element 130, the inductor L1 and the capacitor C1 are disposed on the substrate 101, and the substrate 101 can be, for example, a printed circuit board. The inductor L1 is coupled between the second connection end 122 and the integrated circuit 20, and the capacitor C1 is coupled between the second connection end 122 and the ground GND. In detail, the first end of the inductor L1 is coupled to the second connecting end 122, and the second end of the inductor L1 is coupled to the integrated circuit 20. The first end of the capacitor C1 is coupled to the first end of the inductor L1, and the second end of the capacitor C1 is coupled to the ground GND.

In operation, when the spur signal appears at the input/output point 110, the surge protection device 10 can form a shunt path through the protection element 130, and can form another shunt path through the capacitor C1. In addition, the surge protection device 10 can block the surge signal through the inductor L1 to prevent the surge signal from flowing into the integrated circuit 20. In other words, when the spur signal appears at the input and output point 110, the spur protection device 10 can block the spur signal from flowing into the integrated circuit 20 through the inductor L1, and can transmit the glitch signal through the conductive line 120, the protection component 130 and the capacitor C1. The guidance to the ground GND helps to improve the protection capability of the surge protection device 10.

For example, in the case where the surge protection device 10 is not provided, the integrated circuit 20 is capable of withstanding a surge signal of about 4 kV. In the case where only the protection element 130 is provided, the resistance of the integrated circuit 20 to the glitch signal can be increased to approximately 12 kV. In the case where the protection element 130, the inductor L1 and the capacitor C1 are provided, the resistance of the integrated circuit 20 to the glitch signal can be increased to approximately 16 kV. In addition, in the case of the simultaneous conductive line 120, the protective element 130, the inductor L1 and the capacitor C1, the resistance of the integrated circuit 20 to the surge signal can be increased to approximately 24 kV. In other words, the protection component 130 coupled to the discharge tip 123 can effectively enhance the protection capability of the surge protection device 10, thereby effectively improving the resistance of the integrated circuit 20 to the surge signal.

In summary, the present invention is to provide a discharge tip on the conductive line and couple the protection element to the discharge tip of the conductive line. Thereby, the protection element can be quickly turned on in response to the tip effect formed by the surge signal flowing through the discharge tip, thereby effectively increasing the reaction speed of the surge protection device, thereby contributing to the improvement of the surge protection device. Protection ability.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧ Surge protection device
110‧‧‧Incoming point
120‧‧‧Flexible wire
121‧‧‧First connection
122‧‧‧second connection
123‧‧‧Discharge tip
130‧‧‧Protection components
101‧‧‧Substrate

20‧‧‧ integrated circuit

D1‧‧‧Transient voltage suppression component

L1‧‧‧Inductance

C1‧‧‧ capacitor

GND‧‧‧ ground terminal

1 is a schematic diagram of a surge protection device in accordance with an embodiment of the present invention.

10‧‧‧ Surge protection device

110‧‧‧Incoming point

120‧‧‧Flexible wire

121‧‧‧First connection

122‧‧‧second connection

123‧‧‧Discharge tip

130‧‧‧Protection components

101‧‧‧Substrate

20‧‧‧ integrated circuit

D1‧‧‧Transient voltage suppression component

L1‧‧‧Inductance

C1‧‧‧ capacitor

GND‧‧‧ ground terminal

Claims (9)

A surge protection device includes: an input/output point; a conductive line having a first connection end, a second connection end and a discharge tip, wherein the first connection end is coupled to the input/output point; and a protection An element is coupled between the discharge tip and a ground end, wherein when a spur signal appears at the input and output point, the protection element is turned on in response to a tip effect of the discharge tip, and the spur protection device transmits The conductive line and the protection component direct the spur signal to the ground to protect an integrated circuit coupled to the second connection. The surge protection device of claim 1, wherein the conductive wire has a V-shape. The surge protection device of claim 1, wherein the conductive wire comprises a bend to form the discharge tip. The surge protection device of claim 1, further comprising an inductor coupled between the second connection end and the integrated circuit. The surge protection device of claim 1, further comprising a capacitor coupled between the second connection end and the ground end. The surge protection device of claim 1, further comprising a substrate, and the input and output points, the conductive line and the protection component are disposed on the substrate. The surge protection device of claim 1, wherein the protection component is a transient voltage suppression component, and the first end of the transient voltage suppression component The discharge tip is directly coupled to the second end of the transient voltage suppression component coupled to the ground. The oscillating protection device of claim 7, further comprising: an inductor, the first end of which is coupled to the second connecting end, the second end of the inductor is coupled to the integrated circuit; and a capacitor, The first end of the capacitor is coupled to the first end of the inductor, and the second end of the capacitor is coupled to the ground. The surge protection device of claim 8, further comprising a substrate, and the input and output points, the conductive line, the transient voltage suppressing element, the inductor and the capacitor are disposed on the substrate.