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Integrated on-chip surge protection circuit

A surge protection and internal circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the problem of complicated layout and wiring, occupying PCB board area, IC products Harm and other problems, to achieve the effect of simplifying layout and wiring, saving PCB board area

Active Publication Date: 2018-08-14
WUXI ETEK MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the system input power environment is harsh, the input to the IC port will generate instantaneous surge voltage and current. If it cannot be released in time, it will cause serious damage to the IC product.
The traditional anti-surge protection structure mainly uses an external TVS (Transient Voltage Suppressor) diode. Due to its special manufacturing process, it cannot be integrated on the chip, occupying the PCB board area, and the layout and wiring are cumbersome.

Method used

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  • Integrated on-chip surge protection circuit

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Embodiment Construction

[0015] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0017] Please refer to figure 1 As shown, it is a schematic circuit diagram of a surge protection circuit in an embodiment of the present invention. figure 1 The surge pr...

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Abstract

The invention provides a surge protection circuit integrated in a chip. The surge protection circuit integrated in the chip comprises a main bleeder circuit and a quick detection circuit. The main bleeder circuit comprises a first diode, a second diode, a second resistor and a first MOS (metal oxide semiconductor) tube. A cathode of the first diode is connected with a power end, an anode of the first diode is grounded through the second resistor, and a node between the first diode and the second resistor is a first node. A first connection end of the first MOS tube is connected with the power end, a second connection end of the first MOS tube is grounded, and a control end is connected with the first node. The quick detection circuit comprises a capacitor, a first resistor, a third diode and a second MOS tube. The capacitor is connected between the power end and the third diode, an anode of the third diode is grounded, and a node between the third diode and the capacitor is a second node. A first connection end of the second MOS tube is connected with the power end, a second connection end of the second MOS tube is connected with the first node, and a control end is connected with the second node. Compared with the prior art, the surge protection circuit integrated in the chip has the advantage that surge protection of an internal circuit of the chip can be realized.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to a surge protection circuit which can be integrated in a chip. 【Background technique】 [0002] Surge (Electrical surge) refers to the peak value of the power supply exceeding the stable value in an instant, which includes surge voltage and surge current. When the environment of the system input power supply is harsh, the input to the IC port will generate instantaneous surge voltage and current. If it cannot be released in time, it will cause serious damage to the IC product. The traditional anti-surge protection structure mainly uses an external TVS (Transient Voltage Suppressor) diode. Due to its special manufacturing process, it cannot be integrated on the chip, occupying the area of ​​the PCB board, and the layout and wiring are cumbersome. [0003] Therefore, it is necessary to develop a surge protection structure that can be integrated on a chip to solve the above problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H9/04
CPCH02H9/02H02H9/04
Inventor 伍旻吴相俊汪芳汪东
Owner WUXI ETEK MICROELECTRONICS
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