CN207069560U - A kind of overvoltage protection chip - Google Patents
A kind of overvoltage protection chip Download PDFInfo
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- CN207069560U CN207069560U CN201721093267.5U CN201721093267U CN207069560U CN 207069560 U CN207069560 U CN 207069560U CN 201721093267 U CN201721093267 U CN 201721093267U CN 207069560 U CN207069560 U CN 207069560U
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- circuit
- protection chip
- overvoltage protection
- overvoltage
- high voltage
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Abstract
A kind of overvoltage protection chip, including：High voltage surge clamp circuit, overvoltage clamping circuit, control circuit and on-off circuit；High voltage surge clamp circuit is arranged at the input of overvoltage protection chip; overvoltage clamping circuit is arranged at the output end of overvoltage protection chip; on-off circuit is arranged between high voltage surge clamp circuit and overvoltage clamping circuit; the output end of control circuit is coupled to on-off circuit, the break-make of controlling switch circuit.Filtered out because overvoltage protection chip enters horizontal high voltage in input, then carry out overvoltage in output end and filter out, by dual filter out the high voltage part of overvoltage protection chip back-end circuit can made thoroughly to filter out, the circuit of overvoltage protection chip rear end is protected；Further, since the input and output end of overvoltage protection chip are provided with clamp circuit, when the overvoltage protection chip is used cooperatively with other mainboards, it is not necessary to be further added by TVS pipe at mainboard end, further save arrangement space.
Description
Technical field
It the utility model is related to voltage protection chip, and in particular to a kind of overvoltage protection chip.
Background technology
Overvoltage protection chip (OVP) is that the high voltage part that will be above setting threshold value judges to filter out by its internal logic
Fall, to prevent high voltage from causing to damage to back-end circuit；But because the OVP protections chip reaction speed of current industry exists
100ns or so, cause a part of high voltage to flow to back-end circuit, cause back-end circuit different degrees of damage to be present.
The content of the invention
The application provides a kind of overvoltage protection chip, including high voltage surge clamp circuit, overvoltage clamping circuit, control circuit
And on-off circuit；
High voltage surge clamp circuit is arranged at the input of overvoltage protection chip, and overvoltage clamping circuit is arranged at overvoltage protection
The output end of chip, on-off circuit are arranged between high voltage surge clamp circuit and overvoltage clamping circuit, the output of control circuit
End is coupled to on-off circuit, the break-make of controlling switch circuit.
In a kind of embodiment, one end of overvoltage clamping circuit is coupled to the output end of overvoltage protection chip, other end ground connection.
In a kind of embodiment, overvoltage clamping circuit is TVS pipe.
In a kind of embodiment, the operating voltage of overvoltage clamping circuit is 6V.
In a kind of embodiment, in addition to bleeder circuit, the input of bleeder circuit coupled to high voltage surge clamp circuit and
Between on-off circuit, the partial pressure end of bleeder circuit is coupled to control circuit.
According to the overvoltage protection chip of above-described embodiment, filtered out because overvoltage protection chip enters horizontal high voltage in input, then
Overvoltage is carried out in output end to filter out, and by dual filter out the high voltage part of overvoltage protection chip back-end circuit can be made thoroughly to filter
Remove, the circuit of overvoltage protection chip rear end is protected；Further, since the input and output end of overvoltage protection chip are all provided with
Clamp circuit is put, when being used cooperatively overvoltage protection chip and other mainboards, it is not necessary to be further added by TVS pipe at mainboard end, enter
One step saves arrangement space.
Brief description of the drawings
Fig. 1 is overvoltage protection chip principle schematic.
Embodiment
The utility model is described in further detail below by embodiment combination accompanying drawing.
This example provides a kind of overvoltage protection chip, and its schematic diagram is as shown in figure 1, including high voltage surge clamp circuit 1, overvoltage
Clamp circuit 2, control circuit 3 and on-off circuit 4, high voltage surge clamp circuit 1 are arranged at the input of overvoltage protection chip, mistake
Pressure clamp circuit 2 is arranged at the output end of overvoltage protection chip, and on-off circuit 4 is arranged at high voltage surge clamp circuit 1 and overvoltage
Between clamp circuit 2, the output end of control circuit 3 is coupled to on-off circuit 4, the break-make of controlling switch circuit 4.
This example increases high voltage surge clamp circuit 1 by the input in overvoltage protection chip, and in overvoltage protection chip
Output end increase overvoltage clamping circuit 2 so that overvoltage protection chip first enters horizontal high voltage to input voltage and filtered out, then to output electricity
Pressure carries out overvoltage and filtered out, to reach the purpose of protection overvoltage protection chip back-end circuit.
The overvoltage clamping circuit 2 of this example is TVS pipe, and operating voltage 6V, one end of overvoltage clamping circuit 2 is coupled to overvoltage
Protect the output end of chip, other end ground connection.
This example also includes bleeder circuit 5, and bleeder circuit 5 is made up of two divider resistances, the input coupling of bleeder circuit 5
To between high voltage surge clamp circuit 1 and on-off circuit 4, the partial pressure end of bleeder circuit 5 is coupled to control circuit 3.
Further, control circuit 3 include internal band-gap reference reference circuit 31, voltage detecting circuit 32, comparison circuit 33,
Temperature sensing circuit 34, logic control circuit 35 and charge pump 36, wherein, internal band-gap reference reference circuit 31 and voltage detecting
Circuit 32 is connected to the input of comparison circuit 33, and the output end of comparison circuit 33 is connected to logic control circuit 35, patrolled
The output end for collecting control circuit 35 is connected to charge pump 36, and the output end of charge pump 36 is coupled to on-off circuit 4.
The operation principle of the overvoltage protection chip of this example is：, should when the front end of overvoltage protection chip is to its input voltage
Input voltage, which first passes through high voltage surge clamp circuit 1 and enters horizontal high voltage, to be filtered out, and the voltage after filtering out inputs after the partial pressure of bleeder circuit 5
Voltage detecting circuit 32, comparison circuit 33 pass through the electricity to voltage detecting circuit 32 and the input of internal band-gap reference reference circuit 31
Pressure signal is compared, and by comparative result input logic control circuit 35, logic control circuit 35 according to the comparative result and
The temperature value that temperature sensing circuit 34 detects carries out logic control, and split powered-down by charge pump 36 according to logic control result
Road 4 carries out break-make, and after on-off circuit 4 is connected, overvoltage clamping circuit 2 carries out overvoltage to the voltage of output and filtered out, to cause
Pressure protects the voltage of chip rear end circuit output not cause to damage to back-end circuit.
Use above specific case is illustrated to the utility model, is only intended to help and is understood the utility model, and
Not limiting the utility model.For the utility model person of ordinary skill in the field, according to think of of the present utility model
Think, some simple deductions, deformation can also be made or replaced.
Claims (5)
- A kind of 1. overvoltage protection chip, it is characterised in that including：High voltage surge clamp circuit, overvoltage clamping circuit, control circuit And on-off circuit；The high voltage surge clamp circuit is arranged at the input of the overvoltage protection chip, and the overvoltage clamping circuit is arranged at The output end of the overvoltage protection chip, the on-off circuit are arranged at the high voltage surge clamp circuit and overvoltage clamping circuit Between, the output end of the control circuit is coupled to the on-off circuit, controls the break-make of the on-off circuit.
- 2. overvoltage protection chip as claimed in claim 1, it is characterised in that one end of the overvoltage clamping circuit is coupled to institute State the output end of overvoltage protection chip, other end ground connection.
- 3. overvoltage protection chip as claimed in claim 2, it is characterised in that the overvoltage clamping circuit is TVS pipe.
- 4. overvoltage protection chip as claimed in claim 3, it is characterised in that the operating voltage of the overvoltage clamping circuit is 6V。
- 5. overvoltage protection chip as claimed in claim 1, it is characterised in that also including bleeder circuit, the bleeder circuit Input is coupled between the high voltage surge clamp circuit and on-off circuit, and the partial pressure end of the bleeder circuit is coupled to described Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721093267.5U CN207069560U (en) | 2017-08-30 | 2017-08-30 | A kind of overvoltage protection chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721093267.5U CN207069560U (en) | 2017-08-30 | 2017-08-30 | A kind of overvoltage protection chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207069560U true CN207069560U (en) | 2018-03-02 |
Family
ID=61514349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721093267.5U Active CN207069560U (en) | 2017-08-30 | 2017-08-30 | A kind of overvoltage protection chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207069560U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613326A (en) * | 2018-12-18 | 2019-04-12 | 上海南芯半导体科技有限公司 | A kind of input over-voltage detection circuit that can work independently and its implementation |
| CN111200274A (en) * | 2020-01-15 | 2020-05-26 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
-
2017
- 2017-08-30 CN CN201721093267.5U patent/CN207069560U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613326A (en) * | 2018-12-18 | 2019-04-12 | 上海南芯半导体科技有限公司 | A kind of input over-voltage detection circuit that can work independently and its implementation |
| CN111200274A (en) * | 2020-01-15 | 2020-05-26 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
| CN111200274B (en) * | 2020-01-15 | 2022-07-12 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
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