CN107230969A - A kind of power supply overvoltage protection circuit - Google Patents
A kind of power supply overvoltage protection circuit Download PDFInfo
- Publication number
- CN107230969A CN107230969A CN201710424176.3A CN201710424176A CN107230969A CN 107230969 A CN107230969 A CN 107230969A CN 201710424176 A CN201710424176 A CN 201710424176A CN 107230969 A CN107230969 A CN 107230969A
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- diode
- semiconductor
- oxide
- metal
- resistor
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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
- H02H7/1203—Circuits independent of the type of conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of power supply overvoltage protection circuit, it is related to voltage protection technical field.The emitter stage of triode, the source electrode of metal-oxide-semiconductor is connected to input voltage vin end, the series circuit of first resistor and 3rd resistor is connected between the emitter stage and base stage of triode, the colelctor electrode of triode connects the second diode to the gate pole of metal-oxide-semiconductor, the diode of node reversal connection first between first resistor and 3rd resistor is to ground terminal, the gate pole of metal-oxide-semiconductor, drain electrode connects second resistance respectively, 3rd diode is to ground terminal, the drain electrode of metal-oxide-semiconductor is also sequentially connected the 4th diode, 4th resistance, light emitting diode is to ground terminal, the negative pole end of 4th diode is also connected with the parallel circuit of the electric capacity of the first electric capacity the 3rd to ground terminal, the negative pole end connection voltage output Vout ends of 4th diode.Cost of the present invention is low, occupies little space, and results in preferable output over-voltage protection effect, improves the safety and reliability of power supply.
Description
Technical field
The present invention relates to voltage protection technical field, and in particular to a kind of power supply overvoltage protection circuit.
Background technology
At present, the power supply output overvoltage protection circuit of prior art, typically detects output voltage, when output voltage is too high
When, voltage-regulator diode conducting, optocoupler conducting, triode ON, so that IC chip can be caused into protection voltage pull-down, so as to realize
Output over-voltage protection, but such a technical costs is higher, it is necessary to take larger PCB space, and protecting effect is not good, is based on
This, designs a kind of power supply overvoltage protection circuit or necessary.
The content of the invention
In view of the shortcomings of the prior art, the present invention seeks to be to provide a kind of power supply overvoltage protection circuit, into
This is low, occupies little space, results in preferable output over-voltage protection effect, improve the safety and reliability of power supply.
To achieve these goals, the present invention is to realize by the following technical solutions：A kind of power supply overvoltage protection electricity
Road, including first the-the four diode of diode, light emitting diode, triode, metal-oxide-semiconductor, the resistance of first resistor-the four, the first electricity
Hold the-the three electric capacity, the emitter stage of triode, the source electrode of metal-oxide-semiconductor are connected to input voltage vin end, the emitter stage and base of triode
The series circuit of first resistor and 3rd resistor is connected between pole, the colelctor electrode of triode connects the second diode to metal-oxide-semiconductor
Gate pole, the diode of node reversal connection first between first resistor and 3rd resistor is to ground terminal, and the gate pole of metal-oxide-semiconductor, drain electrode connect respectively
Second resistance, the 3rd diode to ground terminal are connect, the drain electrode of metal-oxide-semiconductor is also sequentially connected the 4th diode, the 4th resistance, light-emitting diodes
Pipe is to ground terminal, and the negative pole end of the 4th diode is also connected with the parallel circuit of first the-the three electric capacity of electric capacity to ground terminal, the 4th diode
Negative pole end connection voltage output Vout ends.
Preferably, the first described diode uses voltage-regulator diode, the 3rd diode uses Schottky diode.
Preferably, the triode uses PNP type triode, metal-oxide-semiconductor uses P-channel metal-oxide-semiconductor.
Beneficial effects of the present invention：The circuit results in preferable output over-voltage protection effect, improves the peace of power supply
Full property and reliability, and it is simple in construction, cost is low, occupies little space, it is easy to promote the use of.
Brief description of the drawings
Describe the present invention in detail with reference to the accompanying drawings and detailed description；
Fig. 1 is circuit diagram of the invention.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, is expanded on further the present invention.
Reference picture 1, present embodiment uses following technical scheme：A kind of power supply overvoltage protection circuit, including first
The diode D4 of diode D1- the 4th, light emitting diode D5, triode Q1A, metal-oxide-semiconductor Q2, the resistance R4 of first resistor R1- the 4th,
One electric capacity C1- the 3rd electric capacity C3, triode Q1A emitter stage, metal-oxide-semiconductor Q2 source electrode are connected to input voltage vin end, triode
First resistor R1 and 3rd resistor R3 series circuit are connected between Q1A emitter stage and base stage, triode Q1A colelctor electrode connects
The second diode D2 to metal-oxide-semiconductor Q2 gate pole is connect, the diode of node reversal connection first between first resistor R1 and 3rd resistor R3
D1 is to ground terminal, and metal-oxide-semiconductor Q2 gate pole, drain connection second resistance R2, the 3rd diode D3 to ground terminal, metal-oxide-semiconductor Q2 leakage respectively
Pole is also sequentially connected the 4th diode D4, the 4th resistance R4, light emitting diode D5 to ground terminal, and the 4th diode D4 negative pole end is also
The electric capacity C3 of the first electric capacity C1- the 3rd parallel circuit is connected to ground terminal, the 4th diode D4 negative pole end connects voltage output
Vout ends.
It is worth noting that, the first described diode D1 uses voltage-regulator diode, the 3rd diode D3 uses Schottky
Diode；Described triode Q1A uses PNP type triode, and metal-oxide-semiconductor Q2 uses P-channel metal-oxide-semiconductor.
The principle of present embodiment is：Circuit input voltage is terminated into input voltage is worked as in the output of Vout ends by Vin
Vin ends are raised for some reason, if not being any limitation as or disconnecting, and will burn the chip or circuit of rear class, so
The connection of deenergization and rear class is wanted at input voltage vin end when raising, when input voltage vin end increases, then metal-oxide-semiconductor Q2 disconnects,
When input voltage vin end drops to correct pressure value, metal-oxide-semiconductor Q2 conductings.
The concrete methods of realizing of present embodiment is as follows：The voltage-stabiliser tube that a voltage stabilizing value is Vin+ △ is selected, △ is will
The voltage margin of protection, when more than △, triode Q1A will be turned on, and now the high level at Vin ends just appears in diagram 4
Place, i.e. metal-oxide-semiconductor Q2 gate pole, and will end during P-MOS pipe gate pole high level, so now too high voltage will disconnect,
Rear class will not be passed to, chip is influenceed；And under normal circumstances, Vin terminal voltages are in positive normal pressure value, now triode Q1A will not be led
Logical, then metal-oxide-semiconductor Q2 gate pole is connected to ground, low level through second resistance R2, so metal-oxide-semiconductor Q2 is turned on, i.e. Vin terminal voltages are conducting to
Rear class, metal-oxide-semiconductor Q2 conduction voltage drop is very small, will not reduce Vin terminal voltages, by the 4th diode D4 tube voltage drop Vd, and
Voltage Vin-Vd at Vout ends needed for obtaining.
Present embodiment overvoltage protection effect is good, can effectively improve the safety and reliability of power supply, Practical Stability,
With wide market application foreground.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (4)
1. a kind of power supply overvoltage protection circuit, it is characterised in that including the-the four diode of the first diode (D1) (D4), light
Diode (D5), triode (Q1A), metal-oxide-semiconductor (Q2), the-the four resistance of first resistor (R1) (R4), the first electric capacity (C1)-the three
Electric capacity (C3), emitter stage, the source electrode of metal-oxide-semiconductor (Q2) of triode (Q1A) are connected to input voltage vin end, triode (Q1A)
The series circuit of first resistor (R1) and 3rd resistor (R3), the colelctor electrode of triode (Q1A) are connected between emitter stage and base stage
The second diode (D2) is connected to metal-oxide-semiconductor (Q2) gate pole, the node reversal connection between first resistor (R1) and 3rd resistor (R3)
First diode (D1) to ground terminal, the gate pole of metal-oxide-semiconductor (Q2), drain electrode connects second resistance (R2), the 3rd diode (D3) respectively
To ground terminal, the drain electrode of metal-oxide-semiconductor (Q2) is also sequentially connected the 4th diode (D4), the 4th resistance (R4), light emitting diode (D5) extremely
Ground terminal, the negative pole end of the 4th diode (D4) is also connected with the parallel circuit of the-the three electric capacity of the first electric capacity (C1) (C3) to ground terminal,
The negative pole end connection voltage output Vout ends of four diodes (D4).
2. a kind of power supply overvoltage protection circuit according to claim 1, it is characterised in that described the first diode (D1)
Using voltage-regulator diode, (D3 uses Schottky diode to the 3rd diode.
3. a kind of power supply overvoltage protection circuit according to claim 1, it is characterised in that described triode (Q1A) is adopted
Use PNP type triode.
4. a kind of power supply overvoltage protection circuit according to claim 1, it is characterised in that described metal-oxide-semiconductor (Q2) uses P
Channel MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710424176.3A CN107230969A (en) | 2017-06-07 | 2017-06-07 | A kind of power supply overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710424176.3A CN107230969A (en) | 2017-06-07 | 2017-06-07 | A kind of power supply overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107230969A true CN107230969A (en) | 2017-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710424176.3A Pending CN107230969A (en) | 2017-06-07 | 2017-06-07 | A kind of power supply overvoltage protection circuit |
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| CN (1) | CN107230969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108259826A (en) * | 2018-01-03 | 2018-07-06 | 广州爱易学智能信息科技有限公司 | The image acquisition transmission system of multiple images is shown in same picture |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751698A (en) * | 2012-07-20 | 2012-10-24 | 冠捷显示科技（厦门）有限公司 | Overvoltage protection circuit, power module and overvoltage protection method |
| CN203734283U (en) * | 2013-10-28 | 2014-07-23 | 西安Tcl软件开发有限公司 | Power supply protection circuit and power supply device |
| CN106786353A (en) * | 2016-12-13 | 2017-05-31 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
-
2017
- 2017-06-07 CN CN201710424176.3A patent/CN107230969A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751698A (en) * | 2012-07-20 | 2012-10-24 | 冠捷显示科技（厦门）有限公司 | Overvoltage protection circuit, power module and overvoltage protection method |
| CN203734283U (en) * | 2013-10-28 | 2014-07-23 | 西安Tcl软件开发有限公司 | Power supply protection circuit and power supply device |
| CN106786353A (en) * | 2016-12-13 | 2017-05-31 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108259826A (en) * | 2018-01-03 | 2018-07-06 | 广州爱易学智能信息科技有限公司 | The image acquisition transmission system of multiple images is shown in same picture |
| CN108259826B (en) * | 2018-01-03 | 2020-05-22 | 广州英龙教育设备有限公司 | Image acquisition and transmission system for displaying multiple images on same picture |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171003 |
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| RJ01 | Rejection of invention patent application after publication |