CN210693431U - Simple, practical and automatic-recovery input overvoltage protection circuit - Google Patents
Simple, practical and automatic-recovery input overvoltage protection circuit Download PDFInfo
- Publication number
- CN210693431U CN210693431U CN201921558606.1U CN201921558606U CN210693431U CN 210693431 U CN210693431 U CN 210693431U CN 201921558606 U CN201921558606 U CN 201921558606U CN 210693431 U CN210693431 U CN 210693431U
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- resistor
- capacitor
- mos transistor
- overvoltage protection
- practical
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the input circuit, e.g. transients in the DC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a simple, practical and automatic-recovery input overvoltage protection circuit, which comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a polar capacitor C1, a capacitor C2 and a MOS tube Q1; the diode D of the MOS transistor Q1 is connected to the positive voltage VCC, one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the signal input terminal VIN and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the diode G of the MOS transistor Q1, one end of the resistor R5 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the other end of the resistor R5, one end of the resistor R6 and the cathode of the polar capacitor C1, the cathode of the polar capacitor C1 is grounded, the anode of the polar capacitor C1 is connected to the diode D of the MOS transistor Q1, and the other end of the resistor R46. The utility model discloses it is succinct practical, carry out overvoltage protection to the input.
Description
Technical Field
The utility model relates to a circuit design technical field, concretely relates to but succinct practical automatic recovery's input overvoltage crowbar.
Background
At present, in the conventional universal power supply IC scheme, because an input end has a definite service voltage range, overvoltage or undervoltage protection is only performed on the voltage of an output end, and the input voltage protection function is not provided.
At present, the power supply scheme mostly depends on the voltage of a detection pin of an IC (integrated circuit) to perform overvoltage protection, and a flyback power supply and a feedback winding of a transformer are in the same direction as a secondary winding, so that the flyback power supply can only perform overvoltage protection of output voltage and does not perform input overvoltage protection.
In some countries such as india and africa, the input mains supply is very unstable, and the power supply is often damaged due to the fact that the rated voltage is exceeded.
When lightning surge is applied to the input end, the input voltage is too high, and the product is also often damaged when lightning protection is weak.
SUMMERY OF THE UTILITY MODEL
In view of the above, in order to solve the above problems in the prior art, the present invention provides a compact, practical and automatic recoverable input overvoltage protection circuit.
The utility model discloses an above-mentioned problem is solved to following technical means:
a simple, practical and automatic-recovery input overvoltage protection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a polar capacitor C1, a capacitor C2 and a MOS transistor Q1;
the diode D of the MOS transistor Q1 is connected to the positive voltage VCC, one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the signal input terminal VIN and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the diode G of the MOS transistor Q1, one end of the resistor R5 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the other end of the resistor R5, one end of the resistor R6 and the cathode of the polar capacitor C1, the cathode of the polar capacitor C1 is grounded, the anode of the polar capacitor C1 is connected to the diode D of the MOS transistor Q1, and the other end of the resistor R46.
Further, the MOS transistor Q1 is 2N 7002.
Compared with the prior art, the beneficial effects of the utility model include at least:
the utility model discloses succinct practicality carries out overvoltage protection to the input, when getting rid of the terminal use, input voltage is higher than the rated range in certain extent, and arouse the damage of product and the conflagration that probably appears. The method is applied to power products such as LED driving/adapters/industrial power supplies and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the input overvoltage protection circuit with automatic recovery function of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanying the drawings are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Examples
As shown in fig. 1, the present invention provides a simple, practical and automatic recoverable input overvoltage protection circuit, which includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a polar capacitor C1, a capacitor C2, and a MOS transistor Q1;
the diode D of the MOS transistor Q1 is connected to the positive voltage VCC, one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the signal input terminal VIN and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the diode G of the MOS transistor Q1, one end of the resistor R5 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the other end of the resistor R5, one end of the resistor R6 and the cathode of the polar capacitor C1, the cathode of the polar capacitor C1 is grounded, the anode of the polar capacitor C1 is connected to the diode D of the MOS transistor Q1, and the other end of the resistor R46.
In this embodiment, the MOS transistor Q1 is 2N 7002.
PCB LAYOUT, the utility model discloses increase a 2N7002MOS pipe to and several SMD resistance-capacitance of periphery can. General normal power IC all can have the VCC circuit of power supply, and the part of start-up all connects VIN through using two resistance, the utility model discloses the principle that the circuit adopted is: sampling the input voltage VIN through R3, R4 and R5 when the voltage V on R5R5When the starting voltage of Q1 is reached, Q1 is conducted, VCC voltage is pulled off by R6, IC has no driving voltage output, power MOS is in off state, product enters protection state, and product is protected without damage as long as in the voltage-resistant range of input end components. When the input voltage is recovered to the normal range, the voltage of VR5 is lower than the turn-on voltage of Q1, Q1 is disconnected, VCC is recovered to be normal, and the product is normally output.
The utility model discloses succinct practicality carries out overvoltage protection to the input, when getting rid of the terminal use, input voltage is higher than the rated range in certain extent, and arouse the damage of product and the conflagration that probably appears. The method is applied to power products such as LED driving/adapters/industrial power supplies and the like.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (2)
1. A simple, practical and automatic-recovery input overvoltage protection circuit is characterized by comprising a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a polar capacitor C1, a capacitor C2 and a MOS transistor Q1;
the diode D of the MOS transistor Q1 is connected to the positive voltage VCC, one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the signal input terminal VIN and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the diode G of the MOS transistor Q1, one end of the resistor R5 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the other end of the resistor R5, one end of the resistor R6 and the cathode of the polar capacitor C1, the cathode of the polar capacitor C1 is grounded, the anode of the polar capacitor C1 is connected to the diode D of the MOS transistor Q1, and the other end of the resistor R46.
2. The compact, practical, and automatically recoverable input overvoltage protection circuit according to claim 1, wherein the MOS transistor Q1 is model 2N 7002.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019104585572 | 2019-05-29 | ||
| CN2019207935605 | 2019-05-29 | ||
| CN201910458557 | 2019-05-29 | ||
| CN201920793560 | 2019-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210693431U true CN210693431U (en) | 2020-06-05 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921558606.1U Active CN210693431U (en) | 2019-05-29 | 2019-09-19 | Simple, practical and automatic-recovery input overvoltage protection circuit |
| CN201910885121.1A Pending CN110474290A (en) | 2019-05-29 | 2019-09-19 | A kind of protection circuit against input over-voltage that brief and practical can restore automatically |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910885121.1A Pending CN110474290A (en) | 2019-05-29 | 2019-09-19 | A kind of protection circuit against input over-voltage that brief and practical can restore automatically |
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| Country | Link |
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| CN (2) | CN210693431U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474290A (en) * | 2019-05-29 | 2019-11-19 | 广东明丰电源电器实业有限公司 | A kind of protection circuit against input over-voltage that brief and practical can restore automatically |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205141657U (en) * | 2015-11-05 | 2016-04-06 | 广州金升阳科技有限公司 | Input overvoltage crowbar |
| CN210693431U (en) * | 2019-05-29 | 2020-06-05 | 广东明丰电源电器实业有限公司 | Simple, practical and automatic-recovery input overvoltage protection circuit |
-
2019
- 2019-09-19 CN CN201921558606.1U patent/CN210693431U/en active Active
- 2019-09-19 CN CN201910885121.1A patent/CN110474290A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474290A (en) * | 2019-05-29 | 2019-11-19 | 广东明丰电源电器实业有限公司 | A kind of protection circuit against input over-voltage that brief and practical can restore automatically |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110474290A (en) | 2019-11-19 |
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