CN103595233A - Input protection circuit - Google Patents
Input protection circuit Download PDFInfo
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- CN103595233A CN103595233A CN201210293029.4A CN201210293029A CN103595233A CN 103595233 A CN103595233 A CN 103595233A CN 201210293029 A CN201210293029 A CN 201210293029A CN 103595233 A CN103595233 A CN 103595233A
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Abstract
The invention relates to an input protection circuit which is connected with a DC-DC power-supply chip. The input protection circuit includes an overcurrent and overvoltage protection circuit which is connected with an input signal and outputs a secondary signal and a secondary protection circuit which is connected with the secondary signal. The secondary protection circuit includes a first capacitor, a positive electrode of which is connected with the secondary signal, a triode, a collecting electrode of which is connected with the secondary signal, a voltage-stabilizing diode, a negative electrode of which is connected with a base electrode of the triode, a schottky diode which is connected in parallel with the triode, a resistor which is connected serially between the secondary signal and the negative electrode of the diode, a second capacitor and a third capacitor, which are connected in parallel with the voltage-stabilizing diode and a fourth capacitor, a positive electrode of which is connected with an emitting electrode of the triode. A negative electrode and a positive electrode of the schottky diode are connected with the collecting electrode and the emitting electrode of the triode respectively. The emitting electrode of the triode is connected with the DC-DC power-supply chip. When the input protection circuit is connected to the DC-DC power-supply chip, normal and reliable operation of the whole system can be ensured and at the same time, the power-supplying range of the system is increased.
Description
Technical field
The present invention relates to a kind of input protection circuit.
Background technology
Along with energy-saving and emission-reduction day is aobvious important, Embedded System Design is more and more considered the problems such as the energy consumption, efficiency of power supply.Increasing system is given up traditional Linear voltage-adjusting circuit, adopts DC-DC power circuit (DC-to-DC Switching Power Supply), the advantage of DC-DC transducer be efficiency high, can export large electric current, quiescent current is little.
But present operation for embedded system environment is diversified, in multiple running environment, power supply quality is difficult to guarantee.And be subject to the impact of chip fabrication technique, DC-DC power supply chip input voltage range has certain limit, will damage DC-DC power supply chip as supply power voltage goes beyond the limit, cause whole system to lose efficacy.
In view of this, be necessary existing input protection circuit to be improved to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of input protection circuit that improves system power supply scope and can guarantee the operation of system normal reliable.
For realizing aforementioned object, the present invention adopts following technical scheme: a kind of input protection circuit, connect DC-DC power supply chip, the overcurrent-overvoltage protecting circuit that it comprises a connection input signal and exports second signal, the safe secondary protection circuit that connects second signal, described safe secondary protection circuit comprises anodal the first electric capacity that connects second signal, collector electrode connects the triode of second signal, the voltage stabilizing didoe of negative pole connecting triode base stage, be connected in parallel on the Schottky diode on triode, be connected on the resistance between second signal and voltage stabilizing didoe negative pole, second electric capacity in parallel with voltage stabilizing didoe and the 3rd electric capacity, and the 4th electric capacity of anodal connecting triode emitter, the negative pole of described Schottky diode and the anodal collector and emitter of connecting triode respectively, the emitter of described triode is connected with DC-DC power supply chip.
As a further improvement on the present invention, described overcurrent-overvoltage protecting circuit comprises transient voltage twin zener dioder and diode, and one end of described transient voltage twin zener dioder and diode is connected with input signal respectively, described diode output second signal.
As a further improvement on the present invention, described overcurrent-overvoltage protecting circuit also comprises the fuse being serially connected between diode and input signal.
As a further improvement on the present invention, described voltage stabilizing didoe comprises the positive pole that connects fuse and the negative pole that is connected safe secondary protection circuit.
The invention has the beneficial effects as follows: owing to being provided with overcurrent-overvoltage protecting circuit and safe secondary protection circuit in the present invention, when the present invention being connected to DC-DC power supply chip, can guarantee the operation of whole system normal reliable, improve system power supply scope simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of input protection circuit in the specific embodiment of the invention.
Embodiment
Refer to Fig. 1, the input protection circuit 30 in one embodiment of the invention, for Embedded System Design, connects DC-DC power supply chip (not shown).Described input protection circuit 30 comprises a connection input signal VIN and exports the safe secondary protection circuit 20 of the overcurrent-overvoltage protecting circuit 10 of second signal VHIN PRO, connection second signal VHIN PRO.
Described overcurrent-overvoltage protecting circuit 10 comprises fuse PTC1, diode D1 and transient voltage twin zener dioder TVS1.Described fuse PTC1 one end is connected with input signal VIN, and the other end is connected with one end of transient voltage twin zener dioder TVS1 with diode D1 respectively.Described diode D1 comprises the positive pole and the negative pole that is connected safe secondary protection circuit 20 that connects fuse PTC1.The negative pole output second signal VHIN PRO of diode D1.
Described safe secondary protection circuit 20 comprises anodal the first capacitor C 5 that connects second signal VHIN PRO, collector electrode 2 connects the triode Q1 of second signal VHIN PRO, the voltage stabilizing didoe VS1 of negative pole connecting triode Q1 base stage 1, be connected in parallel on the Schottky diode SD1 on triode Q1, be connected on the resistance R 5 between second signal VHIN PRO and voltage stabilizing didoe VS1 negative pole, second capacitor C 6 in parallel with voltage stabilizing didoe VS1 and the 3rd capacitor C Y1, and the 4th capacitor C 4 of anodal connecting triode Q1 emitter 3, the negative pole of described Schottky diode SD1 and anodal collector electrode 2 and the emitter 3 of connecting triode Q1 respectively, the emitter 3 of described triode Q1 is connected with DC-DC power supply chip.
When above-mentioned input protection circuit 30 is during for embedded system, embedded system externally fed is from VIN, VIN is the input signal of this input protection circuit 30, input signal VIN inlet flow overvoltage crowbar 10, when the fuse PTC1 in overcurrent-overvoltage protecting circuit 10 sets threshold values in order to surpass at electric current, resistance value raises, increasing whole circuit impedance, is current reduction, plays overcurrent protection; Transient voltage twin zener dioder TVS1 in overcurrent-overvoltage protecting circuit 10 conducting when voltage surpasses certain threshold values, magnitude of voltage is clamped within the scope of threshold values, play voltage protective effect; Diode D1 prevents that electric power polarity from connecing instead.
After overcurrent-overvoltage protecting circuit 10 receives input signal VIN, export second signal VHIN PRO to safe secondary protection circuit 20, safe secondary protection circuit 20 is clamped in the input voltage range of DC-DC power supply chip by output voltage VO UT.The operation principle of this safe secondary protection circuit 20 is as follows:
The clamped threshold values of output voltage VO UT determined by voltage stabilizing didoe VS1, and actual value is the base stage 1 and emitter 3 junction voltages that voltage stabilizing didoe VS1 voltage stabilizing value deducts triode Q1.At secondary voltage VHIN PRO triode Q1 saturation conduction during lower than clamped threshold values, now triode Q1 is similar to straight-through substantially; When secondary voltage VHIN PRO is during higher than clamped threshold values, output voltage VO UT will be by clamped to clamped threshold values, and voltage difference is born by triode Q1.
In sum, owing to being provided with overcurrent-overvoltage protecting circuit 10 and safe secondary protection circuit 20 in input protection circuit 30, when the present invention being connected to DC-DC power supply chip, can guarantee the operation of whole system normal reliable, improve system power supply scope simultaneously.
Although be example object, the preferred embodiment of the present invention is disclosed, but those of ordinary skill in the art will recognize, in the situation that not departing from by the disclosed scope and spirit of the present invention of appending claims, various improvement, increase and replacement are possible.
Claims (4)
1. an input protection circuit, connect DC-DC power supply chip, it is characterized in that: described input protection circuit comprises a connection input signal and exports the overcurrent-overvoltage protecting circuit of second signal, the safe secondary protection circuit that connects second signal, described safe secondary protection circuit comprises anodal the first electric capacity that connects second signal, collector electrode connects the triode of second signal, the voltage stabilizing didoe of negative pole connecting triode base stage, be connected in parallel on the Schottky diode on triode, be connected on the resistance between second signal and voltage stabilizing didoe negative pole, second electric capacity in parallel with voltage stabilizing didoe and the 3rd electric capacity, and the 4th electric capacity of anodal connecting triode emitter, the negative pole of described Schottky diode and the anodal collector and emitter of connecting triode respectively, the emitter of described triode is connected with DC-DC power supply chip.
2. input protection circuit according to claim 1; it is characterized in that: described overcurrent-overvoltage protecting circuit comprises transient voltage twin zener dioder and diode; one end of described transient voltage twin zener dioder and diode is connected with input signal respectively, described diode output second signal.
3. input protection circuit according to claim 2, is characterized in that: described overcurrent-overvoltage protecting circuit also comprises the fuse being serially connected between diode and input signal.
4. according to the input protection circuit described in claim 2 or 3, it is characterized in that: described voltage stabilizing didoe comprises the positive pole that connects fuse and the negative pole that is connected safe secondary protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210293029.4A CN103595233A (en) | 2012-08-17 | 2012-08-17 | Input protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210293029.4A CN103595233A (en) | 2012-08-17 | 2012-08-17 | Input protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103595233A true CN103595233A (en) | 2014-02-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210293029.4A Pending CN103595233A (en) | 2012-08-17 | 2012-08-17 | Input protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103595233A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098933A (en) * | 2015-09-28 | 2015-11-25 | 重庆长安汽车股份有限公司 | Battery monomer acquisition detection device |
| CN106405441A (en) * | 2016-11-13 | 2017-02-15 | 深圳市迅特通信技术有限公司 | Aging testing device for optical module |
| CN112713760A (en) * | 2020-12-01 | 2021-04-27 | 北京无线电测量研究所 | Parallel redundant ferrite switch driver |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007252035A (en) * | 2006-03-14 | 2007-09-27 | Funai Electric Co Ltd | Transistor circuit and ac/dc converter using the same |
| JP2009195073A (en) * | 2008-02-18 | 2009-08-27 | Nichicon Corp | Switching power supply unit |
| CN201690361U (en) * | 2010-04-14 | 2010-12-29 | 普力生(厦门)机电有限公司 | High-voltage resistant power circuit for motorcycle meter |
| CN202333771U (en) * | 2011-10-14 | 2012-07-11 | 中联重科股份有限公司 | Power protection circuit and engineering machine |
-
2012
- 2012-08-17 CN CN201210293029.4A patent/CN103595233A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007252035A (en) * | 2006-03-14 | 2007-09-27 | Funai Electric Co Ltd | Transistor circuit and ac/dc converter using the same |
| JP2009195073A (en) * | 2008-02-18 | 2009-08-27 | Nichicon Corp | Switching power supply unit |
| CN201690361U (en) * | 2010-04-14 | 2010-12-29 | 普力生(厦门)机电有限公司 | High-voltage resistant power circuit for motorcycle meter |
| CN202333771U (en) * | 2011-10-14 | 2012-07-11 | 中联重科股份有限公司 | Power protection circuit and engineering machine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098933A (en) * | 2015-09-28 | 2015-11-25 | 重庆长安汽车股份有限公司 | Battery monomer acquisition detection device |
| CN106405441A (en) * | 2016-11-13 | 2017-02-15 | 深圳市迅特通信技术有限公司 | Aging testing device for optical module |
| CN106405441B (en) * | 2016-11-13 | 2023-08-04 | 深圳市迅特通信技术股份有限公司 | Aging test device of optical module |
| CN112713760A (en) * | 2020-12-01 | 2021-04-27 | 北京无线电测量研究所 | Parallel redundant ferrite switch driver |
| CN112713760B (en) * | 2020-12-01 | 2022-03-04 | 北京无线电测量研究所 | Parallel redundant ferrite switch driver |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140219 |